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The SSE rsqrt instruction (a fast reciprocal square root estimate) was grouped in the same scheduling IIC_SSE_SQRT* class as the accurate (but very slow) SSE sqrt instruction. For code which uses rsqrt (possibly with newton-raphson iterations) this poor scheduling was affecting performances. This patch splits off the rsqrt instruction from the sqrt instruction scheduling classes and creates new IIC_SSE_RSQER* classes with latency values based on Agner's table. Differential Revision: http://reviews.llvm.org/D5370 Patch by Simon Pilgrim. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218517 91177308-0d34-0410-b5e6-96231b3b80d8
342 lines
11 KiB
TableGen
342 lines
11 KiB
TableGen
//=- X86ScheduleBtVer2.td - X86 BtVer2 (Jaguar) Scheduling ---*- tablegen -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the machine model for AMD btver2 (Jaguar) to support
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// instruction scheduling and other instruction cost heuristics. Based off AMD Software
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// Optimization Guide for AMD Family 16h Processors & Instruction Latency appendix.
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//
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//===----------------------------------------------------------------------===//
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def BtVer2Model : SchedMachineModel {
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// All x86 instructions are modeled as a single micro-op, and btver2 can
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// decode 2 instructions per cycle.
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let IssueWidth = 2;
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let MicroOpBufferSize = 64; // Retire Control Unit
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let LoadLatency = 5; // FPU latency (worse case cf Integer 3 cycle latency)
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let HighLatency = 25;
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let MispredictPenalty = 14; // Minimum branch misdirection penalty
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let PostRAScheduler = 1;
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// FIXME: SSE4/AVX is unimplemented. This flag is set to allow
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// the scheduler to assign a default model to unrecognized opcodes.
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let CompleteModel = 0;
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}
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let SchedModel = BtVer2Model in {
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// Jaguar can issue up to 6 micro-ops in one cycle
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def JALU0 : ProcResource<1>; // Integer Pipe0: integer ALU0 (also handle FP->INT jam)
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def JALU1 : ProcResource<1>; // Integer Pipe1: integer ALU1/MUL/DIV
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def JLAGU : ProcResource<1>; // Integer Pipe2: LAGU
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def JSAGU : ProcResource<1>; // Integer Pipe3: SAGU (also handles 3-operand LEA)
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def JFPU0 : ProcResource<1>; // Vector/FPU Pipe0: VALU0/VIMUL/FPA
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def JFPU1 : ProcResource<1>; // Vector/FPU Pipe1: VALU1/STC/FPM
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// Any pipe - FIXME we need this until we can discriminate between int/fpu load/store/moves properly
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def JAny : ProcResGroup<[JALU0, JALU1, JLAGU, JSAGU, JFPU0, JFPU1]>;
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// Integer Pipe Scheduler
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def JALU01 : ProcResGroup<[JALU0, JALU1]> {
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let BufferSize=20;
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}
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// AGU Pipe Scheduler
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def JLSAGU : ProcResGroup<[JLAGU, JSAGU]> {
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let BufferSize=12;
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}
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// Fpu Pipe Scheduler
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def JFPU01 : ProcResGroup<[JFPU0, JFPU1]> {
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let BufferSize=18;
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}
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def JDiv : ProcResource<1>; // integer division
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def JMul : ProcResource<1>; // integer multiplication
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def JVALU0 : ProcResource<1>; // vector integer
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def JVALU1 : ProcResource<1>; // vector integer
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def JVIMUL : ProcResource<1>; // vector integer multiplication
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def JSTC : ProcResource<1>; // vector store/convert
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def JFPM : ProcResource<1>; // FP multiplication
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def JFPA : ProcResource<1>; // FP addition
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// Integer loads are 3 cycles, so ReadAfterLd registers needn't be available until 3
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// cycles after the memory operand.
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def : ReadAdvance<ReadAfterLd, 3>;
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// Many SchedWrites are defined in pairs with and without a folded load.
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// Instructions with folded loads are usually micro-fused, so they only appear
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// as two micro-ops when dispatched by the schedulers.
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// This multiclass defines the resource usage for variants with and without
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// folded loads.
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multiclass JWriteResIntPair<X86FoldableSchedWrite SchedRW,
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ProcResourceKind ExePort,
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int Lat> {
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// Register variant is using a single cycle on ExePort.
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def : WriteRes<SchedRW, [ExePort]> { let Latency = Lat; }
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// Memory variant also uses a cycle on JLAGU and adds 3 cycles to the
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// latency.
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def : WriteRes<SchedRW.Folded, [JLAGU, ExePort]> {
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let Latency = !add(Lat, 3);
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}
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}
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multiclass JWriteResFpuPair<X86FoldableSchedWrite SchedRW,
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ProcResourceKind ExePort,
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int Lat> {
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// Register variant is using a single cycle on ExePort.
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def : WriteRes<SchedRW, [ExePort]> { let Latency = Lat; }
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// Memory variant also uses a cycle on JLAGU and adds 5 cycles to the
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// latency.
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def : WriteRes<SchedRW.Folded, [JLAGU, ExePort]> {
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let Latency = !add(Lat, 5);
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}
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}
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// A folded store needs a cycle on the SAGU for the store data.
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def : WriteRes<WriteRMW, [JSAGU]>;
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////////////////////////////////////////////////////////////////////////////////
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// Arithmetic.
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////////////////////////////////////////////////////////////////////////////////
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defm : JWriteResIntPair<WriteALU, JALU01, 1>;
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defm : JWriteResIntPair<WriteIMul, JALU1, 3>;
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def : WriteRes<WriteIMulH, [JALU1]> {
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let Latency = 6;
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let ResourceCycles = [4];
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}
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// FIXME 8/16 bit divisions
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def : WriteRes<WriteIDiv, [JALU1, JDiv]> {
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let Latency = 25;
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let ResourceCycles = [1, 25];
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}
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def : WriteRes<WriteIDivLd, [JALU1, JLAGU, JDiv]> {
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let Latency = 41;
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let ResourceCycles = [1, 1, 25];
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}
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// This is for simple LEAs with one or two input operands.
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// FIXME: SAGU 3-operand LEA
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def : WriteRes<WriteLEA, [JALU01]>;
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////////////////////////////////////////////////////////////////////////////////
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// Integer shifts and rotates.
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////////////////////////////////////////////////////////////////////////////////
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defm : JWriteResIntPair<WriteShift, JALU01, 1>;
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////////////////////////////////////////////////////////////////////////////////
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// Loads, stores, and moves, not folded with other operations.
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// FIXME: Split x86 and SSE load/store/moves
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////////////////////////////////////////////////////////////////////////////////
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def : WriteRes<WriteLoad, [JLAGU]> { let Latency = 5; }
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def : WriteRes<WriteStore, [JSAGU]>;
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def : WriteRes<WriteMove, [JAny]>;
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////////////////////////////////////////////////////////////////////////////////
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// Idioms that clear a register, like xorps %xmm0, %xmm0.
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// These can often bypass execution ports completely.
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////////////////////////////////////////////////////////////////////////////////
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def : WriteRes<WriteZero, []>;
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////////////////////////////////////////////////////////////////////////////////
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// Branches don't produce values, so they have no latency, but they still
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// consume resources. Indirect branches can fold loads.
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////////////////////////////////////////////////////////////////////////////////
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defm : JWriteResIntPair<WriteJump, JALU01, 1>;
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////////////////////////////////////////////////////////////////////////////////
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// Floating point. This covers both scalar and vector operations.
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// FIXME: should we bother splitting JFPU pipe + unit stages for fast instructions?
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// FIXME: Double precision latencies
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// FIXME: SS vs PS latencies
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// FIXME: ymm latencies
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////////////////////////////////////////////////////////////////////////////////
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defm : JWriteResFpuPair<WriteFAdd, JFPU0, 3>;
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defm : JWriteResFpuPair<WriteFMul, JFPU1, 2>;
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defm : JWriteResFpuPair<WriteFRcp, JFPU1, 2>;
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defm : JWriteResFpuPair<WriteFRsqrt, JFPU1, 2>;
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defm : JWriteResFpuPair<WriteFShuffle, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteFBlend, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteFShuffle256, JFPU01, 1>;
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def : WriteRes<WriteFSqrt, [JFPU1, JLAGU, JFPM]> {
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let Latency = 21;
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let ResourceCycles = [1, 1, 21];
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}
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def : WriteRes<WriteFSqrtLd, [JFPU1, JLAGU, JFPM]> {
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let Latency = 26;
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let ResourceCycles = [1, 1, 21];
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}
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def : WriteRes<WriteFDiv, [JFPU1, JLAGU, JFPM]> {
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let Latency = 19;
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let ResourceCycles = [1, 1, 19];
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}
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def : WriteRes<WriteFDivLd, [JFPU1, JLAGU, JFPM]> {
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let Latency = 24;
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let ResourceCycles = [1, 1, 19];
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}
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// FIXME: integer pipes
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defm : JWriteResFpuPair<WriteCvtF2I, JFPU1, 3>; // Float -> Integer.
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defm : JWriteResFpuPair<WriteCvtI2F, JFPU1, 3>; // Integer -> Float.
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defm : JWriteResFpuPair<WriteCvtF2F, JFPU1, 3>; // Float -> Float size conversion.
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def : WriteRes<WriteFVarBlend, [JFPU01]> {
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let Latency = 2;
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let ResourceCycles = [2];
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}
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def : WriteRes<WriteFVarBlendLd, [JLAGU, JFPU01]> {
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let Latency = 7;
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let ResourceCycles = [1, 2];
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}
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// Vector integer operations.
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defm : JWriteResFpuPair<WriteVecALU, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteVecShift, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteVecIMul, JFPU0, 2>;
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defm : JWriteResFpuPair<WriteShuffle, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteBlend, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteVecLogic, JFPU01, 1>;
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defm : JWriteResFpuPair<WriteShuffle256, JFPU01, 1>;
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def : WriteRes<WriteVarBlend, [JFPU01]> {
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let Latency = 2;
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let ResourceCycles = [2];
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}
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def : WriteRes<WriteVarBlendLd, [JLAGU, JFPU01]> {
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let Latency = 7;
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let ResourceCycles = [1, 2];
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}
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// FIXME: why do we need to define AVX2 resource on CPU that doesn't have AVX2?
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def : WriteRes<WriteVarVecShift, [JFPU01]> {
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let Latency = 1;
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let ResourceCycles = [1];
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}
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def : WriteRes<WriteVarVecShiftLd, [JLAGU, JFPU01]> {
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let Latency = 6;
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let ResourceCycles = [1, 1];
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}
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def : WriteRes<WriteMPSAD, [JFPU0]> {
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let Latency = 3;
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let ResourceCycles = [2];
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}
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def : WriteRes<WriteMPSADLd, [JLAGU, JFPU0]> {
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let Latency = 8;
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let ResourceCycles = [1, 2];
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}
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////////////////////////////////////////////////////////////////////////////////
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// String instructions.
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// Packed Compare Implicit Length Strings, Return Mask
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// FIXME: approximate latencies + pipe dependencies
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////////////////////////////////////////////////////////////////////////////////
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def : WriteRes<WritePCmpIStrM, [JFPU01]> {
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let Latency = 7;
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let ResourceCycles = [2];
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}
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def : WriteRes<WritePCmpIStrMLd, [JLAGU, JFPU01]> {
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let Latency = 12;
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let ResourceCycles = [1, 2];
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}
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// Packed Compare Explicit Length Strings, Return Mask
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def : WriteRes<WritePCmpEStrM, [JFPU01]> {
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let Latency = 13;
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let ResourceCycles = [5];
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}
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def : WriteRes<WritePCmpEStrMLd, [JLAGU, JFPU01]> {
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let Latency = 18;
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let ResourceCycles = [1, 5];
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}
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// Packed Compare Implicit Length Strings, Return Index
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def : WriteRes<WritePCmpIStrI, [JFPU01]> {
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let Latency = 6;
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let ResourceCycles = [2];
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}
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def : WriteRes<WritePCmpIStrILd, [JLAGU, JFPU01]> {
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let Latency = 11;
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let ResourceCycles = [1, 2];
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}
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// Packed Compare Explicit Length Strings, Return Index
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def : WriteRes<WritePCmpEStrI, [JFPU01]> {
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let Latency = 13;
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let ResourceCycles = [5];
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}
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def : WriteRes<WritePCmpEStrILd, [JLAGU, JFPU01]> {
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let Latency = 18;
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let ResourceCycles = [1, 5];
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}
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////////////////////////////////////////////////////////////////////////////////
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// AES Instructions.
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////////////////////////////////////////////////////////////////////////////////
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def : WriteRes<WriteAESDecEnc, [JFPU01, JVIMUL]> {
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let Latency = 3;
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let ResourceCycles = [1, 1];
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}
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def : WriteRes<WriteAESDecEncLd, [JFPU01, JLAGU, JVIMUL]> {
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let Latency = 8;
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let ResourceCycles = [1, 1, 1];
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}
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def : WriteRes<WriteAESIMC, [JVIMUL]> {
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let Latency = 2;
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let ResourceCycles = [1];
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}
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def : WriteRes<WriteAESIMCLd, [JLAGU, JVIMUL]> {
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let Latency = 7;
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let ResourceCycles = [1, 1];
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}
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def : WriteRes<WriteAESKeyGen, [JVIMUL]> {
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let Latency = 2;
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let ResourceCycles = [1];
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}
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def : WriteRes<WriteAESKeyGenLd, [JLAGU, JVIMUL]> {
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let Latency = 7;
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let ResourceCycles = [1, 1];
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}
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////////////////////////////////////////////////////////////////////////////////
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// Carry-less multiplication instructions.
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////////////////////////////////////////////////////////////////////////////////
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def : WriteRes<WriteCLMul, [JVIMUL]> {
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let Latency = 2;
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let ResourceCycles = [1];
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}
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def : WriteRes<WriteCLMulLd, [JLAGU, JVIMUL]> {
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let Latency = 7;
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let ResourceCycles = [1, 1];
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}
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// FIXME: pipe for system/microcode?
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def : WriteRes<WriteSystem, [JAny]> { let Latency = 100; }
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def : WriteRes<WriteMicrocoded, [JAny]> { let Latency = 100; }
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def : WriteRes<WriteFence, [JSAGU]>;
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def : WriteRes<WriteNop, []>;
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} // SchedModel
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