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762 lines
25 KiB
C++
762 lines
25 KiB
C++
//===-- SparcV9SchedInfo.cpp ----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Describe the scheduling characteristics of the UltraSparc IIi.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcV9Internals.h"
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using namespace llvm;
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/*---------------------------------------------------------------------------
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Scheduling guidelines for SPARC IIi:
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I-Cache alignment rules (pg 326)
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-- Align a branch target instruction so that it's entire group is within
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the same cache line (may be 1-4 instructions).
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** Don't let a branch that is predicted taken be the last instruction
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on an I-cache line: delay slot will need an entire line to be fetched
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-- Make a FP instruction or a branch be the 4th instruction in a group.
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For branches, there are tradeoffs in reordering to make this happen
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(see pg. 327).
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** Don't put a branch in a group that crosses a 32-byte boundary!
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An artificial branch is inserted after every 32 bytes, and having
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another branch will force the group to be broken into 2 groups.
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iTLB rules:
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-- Don't let a loop span two memory pages, if possible
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Branch prediction performance:
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-- Don't make the branch in a delay slot the target of a branch
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-- Try not to have 2 predicted branches within a group of 4 instructions
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(because each such group has a single branch target field).
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-- Try to align branches in slots 0, 2, 4 or 6 of a cache line (to avoid
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the wrong prediction bits being used in some cases).
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D-Cache timing constraints:
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-- Signed int loads of less than 64 bits have 3 cycle latency, not 2
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-- All other loads that hit in D-Cache have 2 cycle latency
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-- All loads are returned IN ORDER, so a D-Cache miss will delay a later hit
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-- Mis-aligned loads or stores cause a trap. In particular, replace
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mis-aligned FP double precision l/s with 2 single-precision l/s.
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-- Simulations of integer codes show increase in avg. group size of
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33% when code (including esp. non-faulting loads) is moved across
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one branch, and 50% across 2 branches.
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E-Cache timing constraints:
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-- Scheduling for E-cache (D-Cache misses) is effective (due to load buffering)
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Store buffer timing constraints:
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-- Stores can be executed in same cycle as instruction producing the value
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-- Stores are buffered and have lower priority for E-cache until
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highwater mark is reached in the store buffer (5 stores)
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Pipeline constraints:
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-- Shifts can only use IEU0.
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-- CC setting instructions can only use IEU1.
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-- Several other instructions must only use IEU1:
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EDGE(?), ARRAY(?), CALL, JMPL, BPr, PST, and FCMP.
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-- Two instructions cannot store to the same register file in a single cycle
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(single write port per file).
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Issue and grouping constraints:
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-- FP and branch instructions must use slot 4.
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-- Shift instructions cannot be grouped with other IEU0-specific instructions.
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-- CC setting instructions cannot be grouped with other IEU1-specific instrs.
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-- Several instructions must be issued in a single-instruction group:
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MOVcc or MOVr, MULs/x and DIVs/x, SAVE/RESTORE, many others
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-- A CALL or JMPL breaks a group, ie, is not combined with subsequent instrs.
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--
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--
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Branch delay slot scheduling rules:
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-- A CTI couple (two back-to-back CTI instructions in the dynamic stream)
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has a 9-instruction penalty: the entire pipeline is flushed when the
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second instruction reaches stage 9 (W-Writeback).
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-- Avoid putting multicycle instructions, and instructions that may cause
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load misses, in the delay slot of an annulling branch.
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-- Avoid putting WR, SAVE..., RESTORE and RETURN instructions in the
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delay slot of an annulling branch.
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*--------------------------------------------------------------------------- */
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//---------------------------------------------------------------------------
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// List of CPUResources for UltraSPARC IIi.
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//---------------------------------------------------------------------------
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static const CPUResource AllIssueSlots( "All Instr Slots", 4);
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static const CPUResource IntIssueSlots( "Int Instr Slots", 3);
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static const CPUResource First3IssueSlots("Instr Slots 0-3", 3);
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static const CPUResource LSIssueSlots( "Load-Store Instr Slot", 1);
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static const CPUResource CTIIssueSlots( "Ctrl Transfer Instr Slot", 1);
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static const CPUResource FPAIssueSlots( "FP Instr Slot 1", 1);
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static const CPUResource FPMIssueSlots( "FP Instr Slot 2", 1);
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// IEUN instructions can use either Alu and should use IAluN.
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// IEU0 instructions must use Alu 1 and should use both IAluN and IAlu0.
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// IEU1 instructions must use Alu 2 and should use both IAluN and IAlu1.
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static const CPUResource IAluN("Int ALU 1or2", 2);
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static const CPUResource IAlu0("Int ALU 1", 1);
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static const CPUResource IAlu1("Int ALU 2", 1);
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static const CPUResource LSAluC1("Load/Store Unit Addr Cycle", 1);
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static const CPUResource LSAluC2("Load/Store Unit Issue Cycle", 1);
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static const CPUResource LdReturn("Load Return Unit", 1);
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static const CPUResource FPMAluC1("FP Mul/Div Alu Cycle 1", 1);
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static const CPUResource FPMAluC2("FP Mul/Div Alu Cycle 2", 1);
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static const CPUResource FPMAluC3("FP Mul/Div Alu Cycle 3", 1);
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static const CPUResource FPAAluC1("FP Other Alu Cycle 1", 1);
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static const CPUResource FPAAluC2("FP Other Alu Cycle 2", 1);
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static const CPUResource FPAAluC3("FP Other Alu Cycle 3", 1);
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static const CPUResource IRegReadPorts("Int Reg ReadPorts", INT_MAX); // CHECK
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static const CPUResource IRegWritePorts("Int Reg WritePorts", 2); // CHECK
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static const CPUResource FPRegReadPorts("FP Reg Read Ports", INT_MAX);// CHECK
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static const CPUResource FPRegWritePorts("FP Reg Write Ports", 1); // CHECK
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static const CPUResource CTIDelayCycle( "CTI delay cycle", 1);
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static const CPUResource FCMPDelayCycle("FCMP delay cycle", 1);
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//---------------------------------------------------------------------------
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// const InstrClassRUsage SparcV9RUsageDesc[]
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//
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// Purpose:
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// Resource usage information for instruction in each scheduling class.
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// The InstrRUsage Objects for individual classes are specified first.
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// Note that fetch and decode are decoupled from the execution pipelines
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// via an instr buffer, so they are not included in the cycles below.
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//---------------------------------------------------------------------------
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static const InstrClassRUsage NoneClassRUsage = {
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SPARC_NONE,
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/*totCycles*/ 7,
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/* maxIssueNum */ 4,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 4,
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/* feasibleSlots[] */ { 0, 1, 2, 3 },
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/*numEntries*/ 0,
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/* V[] */ {
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/*Cycle G */
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/*Ccle E */
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */
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}
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};
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static const InstrClassRUsage IEUNClassRUsage = {
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SPARC_IEUN,
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/*totCycles*/ 7,
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/* maxIssueNum */ 3,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 3,
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/* feasibleSlots[] */ { 0, 1, 2 },
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/*numEntries*/ 4,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ IntIssueSlots.rid, 0, 1 },
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/*Cycle E */ { IAluN.rid, 1, 1 },
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */ { IRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage IEU0ClassRUsage = {
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SPARC_IEU0,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 3,
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/* feasibleSlots[] */ { 0, 1, 2 },
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/*numEntries*/ 5,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ IntIssueSlots.rid, 0, 1 },
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/*Cycle E */ { IAluN.rid, 1, 1 },
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{ IAlu0.rid, 1, 1 },
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */ { IRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage IEU1ClassRUsage = {
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SPARC_IEU1,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 3,
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/* feasibleSlots[] */ { 0, 1, 2 },
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/*numEntries*/ 5,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ IntIssueSlots.rid, 0, 1 },
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/*Cycle E */ { IAluN.rid, 1, 1 },
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{ IAlu1.rid, 1, 1 },
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */ { IRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage FPMClassRUsage = {
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SPARC_FPM,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 4,
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/* feasibleSlots[] */ { 0, 1, 2, 3 },
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/*numEntries*/ 7,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ FPMIssueSlots.rid, 0, 1 },
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/*Cycle E */ { FPRegReadPorts.rid, 1, 1 },
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/*Cycle C */ { FPMAluC1.rid, 2, 1 },
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/*Cycle N1*/ { FPMAluC2.rid, 3, 1 },
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/*Cycle N1*/ { FPMAluC3.rid, 4, 1 },
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/*Cycle N1*/
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/*Cycle W */ { FPRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage FPAClassRUsage = {
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SPARC_FPA,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 4,
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/* feasibleSlots[] */ { 0, 1, 2, 3 },
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/*numEntries*/ 7,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ FPAIssueSlots.rid, 0, 1 },
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/*Cycle E */ { FPRegReadPorts.rid, 1, 1 },
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/*Cycle C */ { FPAAluC1.rid, 2, 1 },
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/*Cycle N1*/ { FPAAluC2.rid, 3, 1 },
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/*Cycle N1*/ { FPAAluC3.rid, 4, 1 },
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/*Cycle N1*/
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/*Cycle W */ { FPRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage LDClassRUsage = {
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SPARC_LD,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 3,
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/* feasibleSlots[] */ { 0, 1, 2, },
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/*numEntries*/ 6,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ First3IssueSlots.rid, 0, 1 },
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{ LSIssueSlots.rid, 0, 1 },
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/*Cycle E */ { LSAluC1.rid, 1, 1 },
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/*Cycle C */ { LSAluC2.rid, 2, 1 },
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{ LdReturn.rid, 2, 1 },
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */ { IRegWritePorts.rid, 6, 1 }
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}
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};
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static const InstrClassRUsage STClassRUsage = {
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SPARC_ST,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 3,
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/* feasibleSlots[] */ { 0, 1, 2 },
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/*numEntries*/ 4,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ First3IssueSlots.rid, 0, 1 },
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{ LSIssueSlots.rid, 0, 1 },
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/*Cycle E */ { LSAluC1.rid, 1, 1 },
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/*Cycle C */ { LSAluC2.rid, 2, 1 }
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */
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}
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};
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static const InstrClassRUsage CTIClassRUsage = {
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SPARC_CTI,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ false,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 4,
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/* feasibleSlots[] */ { 0, 1, 2, 3 },
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/*numEntries*/ 4,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ CTIIssueSlots.rid, 0, 1 },
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/*Cycle E */ { IAlu0.rid, 1, 1 },
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/*Cycles E-C */ { CTIDelayCycle.rid, 1, 2 }
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */
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}
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};
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static const InstrClassRUsage SingleClassRUsage = {
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SPARC_SINGLE,
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/*totCycles*/ 7,
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/* maxIssueNum */ 1,
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/* isSingleIssue */ true,
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/* breaksGroup */ false,
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/* numBubbles */ 0,
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/*numSlots*/ 1,
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/* feasibleSlots[] */ { 0 },
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/*numEntries*/ 5,
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/* V[] */ {
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/*Cycle G */ { AllIssueSlots.rid, 0, 1 },
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{ AllIssueSlots.rid, 0, 1 },
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{ AllIssueSlots.rid, 0, 1 },
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{ AllIssueSlots.rid, 0, 1 },
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/*Cycle E */ { IAlu0.rid, 1, 1 }
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/*Cycle C */
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle N1*/
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/*Cycle W */
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}
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};
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static const InstrClassRUsage SparcV9RUsageDesc[] = {
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NoneClassRUsage,
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IEUNClassRUsage,
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IEU0ClassRUsage,
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IEU1ClassRUsage,
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FPMClassRUsage,
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FPAClassRUsage,
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CTIClassRUsage,
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LDClassRUsage,
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STClassRUsage,
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SingleClassRUsage
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};
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//---------------------------------------------------------------------------
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// const InstrIssueDelta SparcV9InstrIssueDeltas[]
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//
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// Purpose:
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// Changes to issue restrictions information in InstrClassRUsage for
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// instructions that differ from other instructions in their class.
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//---------------------------------------------------------------------------
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static const InstrIssueDelta SparcV9InstrIssueDeltas[] = {
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// opCode, isSingleIssue, breaksGroup, numBubbles
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// Special cases for single-issue only
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// Other single issue cases are below.
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//{ V9::LDDA, true, true, 0 },
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//{ V9::STDA, true, true, 0 },
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//{ V9::LDDF, true, true, 0 },
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//{ V9::LDDFA, true, true, 0 },
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{ V9::ADDCr, true, true, 0 },
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{ V9::ADDCi, true, true, 0 },
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{ V9::ADDCccr, true, true, 0 },
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{ V9::ADDCcci, true, true, 0 },
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{ V9::SUBCr, true, true, 0 },
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{ V9::SUBCi, true, true, 0 },
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{ V9::SUBCccr, true, true, 0 },
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{ V9::SUBCcci, true, true, 0 },
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//{ V9::LDSTUB, true, true, 0 },
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//{ V9::SWAP, true, true, 0 },
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//{ V9::SWAPA, true, true, 0 },
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//{ V9::CAS, true, true, 0 },
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//{ V9::CASA, true, true, 0 },
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//{ V9::CASX, true, true, 0 },
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//{ V9::CASXA, true, true, 0 },
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//{ V9::LDFSR, true, true, 0 },
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//{ V9::LDFSRA, true, true, 0 },
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//{ V9::LDXFSR, true, true, 0 },
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//{ V9::LDXFSRA, true, true, 0 },
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//{ V9::STFSR, true, true, 0 },
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//{ V9::STFSRA, true, true, 0 },
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//{ V9::STXFSR, true, true, 0 },
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//{ V9::STXFSRA, true, true, 0 },
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//{ V9::SAVED, true, true, 0 },
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//{ V9::RESTORED, true, true, 0 },
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//{ V9::FLUSH, true, true, 9 },
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//{ V9::FLUSHW, true, true, 9 },
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//{ V9::ALIGNADDR, true, true, 0 },
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//{ V9::DONE, true, true, 0 },
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//{ V9::RETRY, true, true, 0 },
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//{ V9::TCC, true, true, 0 },
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//{ V9::SHUTDOWN, true, true, 0 },
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// Special cases for breaking group *before*
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// CURRENTLY NOT SUPPORTED!
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{ V9::CALL, false, false, 0 },
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{ V9::JMPLCALLr, false, false, 0 },
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{ V9::JMPLCALLi, false, false, 0 },
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{ V9::JMPLRETr, false, false, 0 },
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{ V9::JMPLRETi, false, false, 0 },
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// Special cases for breaking the group *after*
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{ V9::MULXr, true, true, (4+34)/2 },
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{ V9::MULXi, true, true, (4+34)/2 },
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{ V9::FDIVS, false, true, 0 },
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{ V9::FDIVD, false, true, 0 },
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{ V9::FDIVQ, false, true, 0 },
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{ V9::FSQRTS, false, true, 0 },
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{ V9::FSQRTD, false, true, 0 },
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{ V9::FSQRTQ, false, true, 0 },
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//{ V9::FCMP{LE,GT,NE,EQ}, false, true, 0 },
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// Instructions that introduce bubbles
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//{ V9::MULScc, true, true, 2 },
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//{ V9::SMULcc, true, true, (4+18)/2 },
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//{ V9::UMULcc, true, true, (4+19)/2 },
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{ V9::SDIVXr, true, true, 68 },
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{ V9::SDIVXi, true, true, 68 },
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{ V9::UDIVXr, true, true, 68 },
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{ V9::UDIVXi, true, true, 68 },
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//{ V9::SDIVcc, true, true, 36 },
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//{ V9::UDIVcc, true, true, 37 },
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{ V9::WRCCRr, true, true, 4 },
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{ V9::WRCCRi, true, true, 4 },
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//{ V9::WRPR, true, true, 4 },
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//{ V9::RDCCR, true, true, 0 }, // no bubbles after, but see below
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//{ V9::RDPR, true, true, 0 },
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};
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//---------------------------------------------------------------------------
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// const InstrRUsageDelta SparcV9InstrUsageDeltas[]
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//
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// Purpose:
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// Changes to resource usage information in InstrClassRUsage for
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// instructions that differ from other instructions in their class.
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//---------------------------------------------------------------------------
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static const InstrRUsageDelta SparcV9InstrUsageDeltas[] = {
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// MachineOpCode, Resource, Start cycle, Num cycles
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//
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// JMPL counts as a load/store instruction for issue!
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//
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{ V9::JMPLCALLr, LSIssueSlots.rid, 0, 1 },
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{ V9::JMPLCALLi, LSIssueSlots.rid, 0, 1 },
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{ V9::JMPLRETr, LSIssueSlots.rid, 0, 1 },
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{ V9::JMPLRETi, LSIssueSlots.rid, 0, 1 },
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//
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// Many instructions cannot issue for the next 2 cycles after an FCMP
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// We model that with a fake resource FCMPDelayCycle.
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//
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{ V9::FCMPS, FCMPDelayCycle.rid, 1, 3 },
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{ V9::FCMPD, FCMPDelayCycle.rid, 1, 3 },
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{ V9::FCMPQ, FCMPDelayCycle.rid, 1, 3 },
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{ V9::MULXr, FCMPDelayCycle.rid, 1, 1 },
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{ V9::MULXi, FCMPDelayCycle.rid, 1, 1 },
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{ V9::SDIVXr, FCMPDelayCycle.rid, 1, 1 },
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{ V9::SDIVXi, FCMPDelayCycle.rid, 1, 1 },
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{ V9::UDIVXr, FCMPDelayCycle.rid, 1, 1 },
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{ V9::UDIVXi, FCMPDelayCycle.rid, 1, 1 },
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//{ V9::SMULcc, FCMPDelayCycle.rid, 1, 1 },
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//{ V9::UMULcc, FCMPDelayCycle.rid, 1, 1 },
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//{ V9::SDIVcc, FCMPDelayCycle.rid, 1, 1 },
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//{ V9::UDIVcc, FCMPDelayCycle.rid, 1, 1 },
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{ V9::STDFr, FCMPDelayCycle.rid, 1, 1 },
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{ V9::STDFi, FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSZ, FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSLEZ,FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSLZ, FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSNZ, FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSGZ, FCMPDelayCycle.rid, 1, 1 },
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{ V9::FMOVRSGEZ,FCMPDelayCycle.rid, 1, 1 },
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//
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// Some instructions are stalled in the GROUP stage if a CTI is in
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// the E or C stage. We model that with a fake resource CTIDelayCycle.
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//
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{ V9::LDDFr, CTIDelayCycle.rid, 1, 1 },
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{ V9::LDDFi, CTIDelayCycle.rid, 1, 1 },
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//{ V9::LDDA, CTIDelayCycle.rid, 1, 1 },
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//{ V9::LDDSTUB, CTIDelayCycle.rid, 1, 1 },
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//{ V9::LDDSTUBA, CTIDelayCycle.rid, 1, 1 },
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//{ V9::SWAP, CTIDelayCycle.rid, 1, 1 },
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//{ V9::SWAPA, CTIDelayCycle.rid, 1, 1 },
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//{ V9::CAS, CTIDelayCycle.rid, 1, 1 },
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//{ V9::CASA, CTIDelayCycle.rid, 1, 1 },
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//{ V9::CASX, CTIDelayCycle.rid, 1, 1 },
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//{ V9::CASXA, CTIDelayCycle.rid, 1, 1 },
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//
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// Signed int loads of less than dword size return data in cycle N1 (not C)
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// and put all loads in consecutive cycles into delayed load return mode.
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//
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{ V9::LDSBr, LdReturn.rid, 2, -1 },
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{ V9::LDSBr, LdReturn.rid, 3, 1 },
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{ V9::LDSBi, LdReturn.rid, 2, -1 },
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{ V9::LDSBi, LdReturn.rid, 3, 1 },
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{ V9::LDSHr, LdReturn.rid, 2, -1 },
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{ V9::LDSHr, LdReturn.rid, 3, 1 },
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{ V9::LDSHi, LdReturn.rid, 2, -1 },
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{ V9::LDSHi, LdReturn.rid, 3, 1 },
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{ V9::LDSWr, LdReturn.rid, 2, -1 },
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{ V9::LDSWr, LdReturn.rid, 3, 1 },
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{ V9::LDSWi, LdReturn.rid, 2, -1 },
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{ V9::LDSWi, LdReturn.rid, 3, 1 },
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//
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// RDPR from certain registers and RD from any register are not dispatchable
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// until four clocks after they reach the head of the instr. buffer.
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// Together with their single-issue requirement, this means all four issue
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// slots are effectively blocked for those cycles, plus the issue cycle.
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// This does not increase the latency of the instruction itself.
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//
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{ V9::RDCCR, AllIssueSlots.rid, 0, 5 },
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{ V9::RDCCR, AllIssueSlots.rid, 0, 5 },
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{ V9::RDCCR, AllIssueSlots.rid, 0, 5 },
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{ V9::RDCCR, AllIssueSlots.rid, 0, 5 },
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|
|
|
#undef EXPLICIT_BUBBLES_NEEDED
|
|
#ifdef EXPLICIT_BUBBLES_NEEDED
|
|
//
|
|
// MULScc inserts one bubble.
|
|
// This means it breaks the current group (captured in UltraSparcV9SchedInfo)
|
|
// *and occupies all issue slots for the next cycle
|
|
//
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|
//{ V9::MULScc, AllIssueSlots.rid, 2, 2-1 },
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//{ V9::MULScc, AllIssueSlots.rid, 2, 2-1 },
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//{ V9::MULScc, AllIssueSlots.rid, 2, 2-1 },
|
|
//{ V9::MULScc, AllIssueSlots.rid, 2, 2-1 },
|
|
|
|
//
|
|
// SMULcc inserts between 4 and 18 bubbles, depending on #leading 0s in rs1.
|
|
// We just model this with a simple average.
|
|
//
|
|
//{ V9::SMULcc, AllIssueSlots.rid, 2, ((4+18)/2)-1 },
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//{ V9::SMULcc, AllIssueSlots.rid, 2, ((4+18)/2)-1 },
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|
//{ V9::SMULcc, AllIssueSlots.rid, 2, ((4+18)/2)-1 },
|
|
//{ V9::SMULcc, AllIssueSlots.rid, 2, ((4+18)/2)-1 },
|
|
|
|
// SMULcc inserts between 4 and 19 bubbles, depending on #leading 0s in rs1.
|
|
//{ V9::UMULcc, AllIssueSlots.rid, 2, ((4+19)/2)-1 },
|
|
//{ V9::UMULcc, AllIssueSlots.rid, 2, ((4+19)/2)-1 },
|
|
//{ V9::UMULcc, AllIssueSlots.rid, 2, ((4+19)/2)-1 },
|
|
//{ V9::UMULcc, AllIssueSlots.rid, 2, ((4+19)/2)-1 },
|
|
|
|
//
|
|
// MULX inserts between 4 and 34 bubbles, depending on #leading 0s in rs1.
|
|
//
|
|
{ V9::MULX, AllIssueSlots.rid, 2, ((4+34)/2)-1 },
|
|
{ V9::MULX, AllIssueSlots.rid, 2, ((4+34)/2)-1 },
|
|
{ V9::MULX, AllIssueSlots.rid, 2, ((4+34)/2)-1 },
|
|
{ V9::MULX, AllIssueSlots.rid, 2, ((4+34)/2)-1 },
|
|
|
|
//
|
|
// SDIVcc inserts 36 bubbles.
|
|
//
|
|
//{ V9::SDIVcc, AllIssueSlots.rid, 2, 36-1 },
|
|
//{ V9::SDIVcc, AllIssueSlots.rid, 2, 36-1 },
|
|
//{ V9::SDIVcc, AllIssueSlots.rid, 2, 36-1 },
|
|
//{ V9::SDIVcc, AllIssueSlots.rid, 2, 36-1 },
|
|
|
|
// UDIVcc inserts 37 bubbles.
|
|
//{ V9::UDIVcc, AllIssueSlots.rid, 2, 37-1 },
|
|
//{ V9::UDIVcc, AllIssueSlots.rid, 2, 37-1 },
|
|
//{ V9::UDIVcc, AllIssueSlots.rid, 2, 37-1 },
|
|
//{ V9::UDIVcc, AllIssueSlots.rid, 2, 37-1 },
|
|
|
|
//
|
|
// SDIVX inserts 68 bubbles.
|
|
//
|
|
{ V9::SDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::SDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::SDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::SDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
|
|
//
|
|
// UDIVX inserts 68 bubbles.
|
|
//
|
|
{ V9::UDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::UDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::UDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
{ V9::UDIVX, AllIssueSlots.rid, 2, 68-1 },
|
|
|
|
//
|
|
// WR inserts 4 bubbles.
|
|
//
|
|
//{ V9::WR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WR, AllIssueSlots.rid, 2, 68-1 },
|
|
|
|
//
|
|
// WRPR inserts 4 bubbles.
|
|
//
|
|
//{ V9::WRPR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WRPR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WRPR, AllIssueSlots.rid, 2, 68-1 },
|
|
//{ V9::WRPR, AllIssueSlots.rid, 2, 68-1 },
|
|
|
|
//
|
|
// DONE inserts 9 bubbles.
|
|
//
|
|
//{ V9::DONE, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::DONE, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::DONE, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::DONE, AllIssueSlots.rid, 2, 9-1 },
|
|
|
|
//
|
|
// RETRY inserts 9 bubbles.
|
|
//
|
|
//{ V9::RETRY, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::RETRY, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::RETRY, AllIssueSlots.rid, 2, 9-1 },
|
|
//{ V9::RETRY, AllIssueSlots.rid, 2, 9-1 },
|
|
|
|
#endif /*EXPLICIT_BUBBLES_NEEDED */
|
|
};
|
|
|
|
// Additional delays to be captured in code:
|
|
// 1. RDPR from several state registers (page 349)
|
|
// 2. RD from *any* register (page 349)
|
|
// 3. Writes to TICK, PSTATE, TL registers and FLUSH{W} instr (page 349)
|
|
// 4. Integer store can be in same group as instr producing value to store.
|
|
// 5. BICC and BPICC can be in the same group as instr producing CC (pg 350)
|
|
// 6. FMOVr cannot be in the same or next group as an IEU instr (pg 351).
|
|
// 7. The second instr. of a CTI group inserts 9 bubbles (pg 351)
|
|
// 8. WR{PR}, SVAE, SAVED, RESTORE, RESTORED, RETURN, RETRY, and DONE that
|
|
// follow an annulling branch cannot be issued in the same group or in
|
|
// the 3 groups following the branch.
|
|
// 9. A predicted annulled load does not stall dependent instructions.
|
|
// Other annulled delay slot instructions *do* stall dependents, so
|
|
// nothing special needs to be done for them during scheduling.
|
|
//10. Do not put a load use that may be annulled in the same group as the
|
|
// branch. The group will stall until the load returns.
|
|
//11. Single-prec. FP loads lock 2 registers, for dependency checking.
|
|
//
|
|
//
|
|
// Additional delays we cannot or will not capture:
|
|
// 1. If DCTI is last word of cache line, it is delayed until next line can be
|
|
// fetched. Also, other DCTI alignment-related delays (pg 352)
|
|
// 2. Load-after-store is delayed by 7 extra cycles if load hits in D-Cache.
|
|
// Also, several other store-load and load-store conflicts (pg 358)
|
|
// 3. MEMBAR, LD{X}FSR, LDD{A} and a bunch of other load stalls (pg 358)
|
|
// 4. There can be at most 8 outstanding buffered store instructions
|
|
// (including some others like MEMBAR, LDSTUB, CAS{AX}, and FLUSH)
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// class SparcV9SchedInfo
|
|
//
|
|
// Purpose:
|
|
// Scheduling information for the UltraSPARC.
|
|
// Primarily just initializes machine-dependent parameters in
|
|
// class TargetSchedInfo.
|
|
//---------------------------------------------------------------------------
|
|
|
|
/*ctor*/
|
|
SparcV9SchedInfo::SparcV9SchedInfo(const TargetMachine& tgt)
|
|
: TargetSchedInfo(tgt,
|
|
(unsigned int) SPARC_NUM_SCHED_CLASSES,
|
|
SparcV9RUsageDesc,
|
|
SparcV9InstrUsageDeltas,
|
|
SparcV9InstrIssueDeltas,
|
|
sizeof(SparcV9InstrUsageDeltas)/sizeof(InstrRUsageDelta),
|
|
sizeof(SparcV9InstrIssueDeltas)/sizeof(InstrIssueDelta))
|
|
{
|
|
maxNumIssueTotal = 4;
|
|
longestIssueConflict = 0; // computed from issuesGaps[]
|
|
|
|
// must be called after above parameters are initialized.
|
|
initializeResources();
|
|
}
|
|
|
|
void
|
|
SparcV9SchedInfo::initializeResources()
|
|
{
|
|
// Compute TargetSchedInfo::instrRUsages and TargetSchedInfo::issueGaps
|
|
TargetSchedInfo::initializeResources();
|
|
|
|
// Machine-dependent fixups go here. None for now.
|
|
}
|