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MachineBasicBlock::canFallThrough(), which is target-independent and more thorough. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90634 91177308-0d34-0410-b5e6-96231b3b80d8
614 lines
19 KiB
C++
614 lines
19 KiB
C++
//===- SPUInstrInfo.cpp - Cell SPU Instruction Information ----------------===//
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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 contains the Cell SPU implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "SPURegisterNames.h"
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#include "SPUInstrInfo.h"
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#include "SPUInstrBuilder.h"
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#include "SPUTargetMachine.h"
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#include "SPUGenInstrInfo.inc"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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//! Predicate for an unconditional branch instruction
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inline bool isUncondBranch(const MachineInstr *I) {
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unsigned opc = I->getOpcode();
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return (opc == SPU::BR
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|| opc == SPU::BRA
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|| opc == SPU::BI);
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}
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//! Predicate for a conditional branch instruction
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inline bool isCondBranch(const MachineInstr *I) {
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unsigned opc = I->getOpcode();
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return (opc == SPU::BRNZr32
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|| opc == SPU::BRNZv4i32
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|| opc == SPU::BRZr32
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|| opc == SPU::BRZv4i32
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|| opc == SPU::BRHNZr16
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|| opc == SPU::BRHNZv8i16
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|| opc == SPU::BRHZr16
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|| opc == SPU::BRHZv8i16);
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}
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}
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SPUInstrInfo::SPUInstrInfo(SPUTargetMachine &tm)
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: TargetInstrInfoImpl(SPUInsts, sizeof(SPUInsts)/sizeof(SPUInsts[0])),
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TM(tm),
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RI(*TM.getSubtargetImpl(), *this)
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{ /* NOP */ }
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bool
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SPUInstrInfo::isMoveInstr(const MachineInstr& MI,
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unsigned& sourceReg,
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unsigned& destReg,
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unsigned& SrcSR, unsigned& DstSR) const {
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SrcSR = DstSR = 0; // No sub-registers.
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switch (MI.getOpcode()) {
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default:
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break;
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case SPU::ORIv4i32:
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case SPU::ORIr32:
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case SPU::ORHIv8i16:
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case SPU::ORHIr16:
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case SPU::ORHIi8i16:
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case SPU::ORBIv16i8:
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case SPU::ORBIr8:
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case SPU::ORIi16i32:
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case SPU::ORIi8i32:
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case SPU::AHIvec:
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case SPU::AHIr16:
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case SPU::AIv4i32:
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isReg() &&
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MI.getOperand(1).isReg() &&
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MI.getOperand(2).isImm() &&
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"invalid SPU ORI/ORHI/ORBI/AHI/AI/SFI/SFHI instruction!");
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if (MI.getOperand(2).getImm() == 0) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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break;
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case SPU::AIr32:
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assert(MI.getNumOperands() == 3 &&
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"wrong number of operands to AIr32");
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if (MI.getOperand(0).isReg() &&
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MI.getOperand(1).isReg() &&
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(MI.getOperand(2).isImm() &&
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MI.getOperand(2).getImm() == 0)) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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break;
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case SPU::LRr8:
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case SPU::LRr16:
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case SPU::LRr32:
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case SPU::LRf32:
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case SPU::LRr64:
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case SPU::LRf64:
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case SPU::LRr128:
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case SPU::LRv16i8:
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case SPU::LRv8i16:
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case SPU::LRv4i32:
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case SPU::LRv4f32:
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case SPU::LRv2i64:
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case SPU::LRv2f64:
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case SPU::ORv16i8_i8:
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case SPU::ORv8i16_i16:
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case SPU::ORv4i32_i32:
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case SPU::ORv2i64_i64:
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case SPU::ORv4f32_f32:
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case SPU::ORv2f64_f64:
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case SPU::ORi8_v16i8:
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case SPU::ORi16_v8i16:
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case SPU::ORi32_v4i32:
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case SPU::ORi64_v2i64:
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case SPU::ORf32_v4f32:
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case SPU::ORf64_v2f64:
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/*
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case SPU::ORi128_r64:
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case SPU::ORi128_f64:
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case SPU::ORi128_r32:
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case SPU::ORi128_f32:
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case SPU::ORi128_r16:
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case SPU::ORi128_r8:
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*/
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case SPU::ORi128_vec:
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/*
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case SPU::ORr64_i128:
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case SPU::ORf64_i128:
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case SPU::ORr32_i128:
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case SPU::ORf32_i128:
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case SPU::ORr16_i128:
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case SPU::ORr8_i128:
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*/
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case SPU::ORvec_i128:
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/*
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case SPU::ORr16_r32:
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case SPU::ORr8_r32:
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case SPU::ORf32_r32:
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case SPU::ORr32_f32:
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case SPU::ORr32_r16:
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case SPU::ORr32_r8:
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case SPU::ORr16_r64:
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case SPU::ORr8_r64:
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case SPU::ORr64_r16:
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case SPU::ORr64_r8:
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*/
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case SPU::ORr64_r32:
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case SPU::ORr32_r64:
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case SPU::ORf32_r32:
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case SPU::ORr32_f32:
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case SPU::ORf64_r64:
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case SPU::ORr64_f64: {
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assert(MI.getNumOperands() == 2 &&
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MI.getOperand(0).isReg() &&
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MI.getOperand(1).isReg() &&
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"invalid SPU OR<type>_<vec> or LR instruction!");
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if (MI.getOperand(0).getReg() == MI.getOperand(1).getReg()) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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break;
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}
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case SPU::ORv16i8:
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case SPU::ORv8i16:
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case SPU::ORv4i32:
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case SPU::ORv2i64:
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case SPU::ORr8:
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case SPU::ORr16:
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case SPU::ORr32:
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case SPU::ORr64:
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case SPU::ORr128:
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case SPU::ORf32:
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case SPU::ORf64:
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isReg() &&
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MI.getOperand(1).isReg() &&
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MI.getOperand(2).isReg() &&
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"invalid SPU OR(vec|r32|r64|gprc) instruction!");
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if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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break;
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}
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return false;
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}
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unsigned
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SPUInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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switch (MI->getOpcode()) {
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default: break;
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case SPU::LQDv16i8:
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case SPU::LQDv8i16:
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case SPU::LQDv4i32:
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case SPU::LQDv4f32:
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case SPU::LQDv2f64:
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case SPU::LQDr128:
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case SPU::LQDr64:
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case SPU::LQDr32:
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case SPU::LQDr16: {
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const MachineOperand MOp1 = MI->getOperand(1);
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const MachineOperand MOp2 = MI->getOperand(2);
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if (MOp1.isImm() && MOp2.isFI()) {
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FrameIndex = MOp2.getIndex();
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return MI->getOperand(0).getReg();
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}
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break;
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}
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}
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return 0;
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}
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unsigned
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SPUInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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switch (MI->getOpcode()) {
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default: break;
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case SPU::STQDv16i8:
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case SPU::STQDv8i16:
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case SPU::STQDv4i32:
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case SPU::STQDv4f32:
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case SPU::STQDv2f64:
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case SPU::STQDr128:
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case SPU::STQDr64:
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case SPU::STQDr32:
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case SPU::STQDr16:
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case SPU::STQDr8: {
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const MachineOperand MOp1 = MI->getOperand(1);
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const MachineOperand MOp2 = MI->getOperand(2);
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if (MOp1.isImm() && MOp2.isFI()) {
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FrameIndex = MOp2.getIndex();
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return MI->getOperand(0).getReg();
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}
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break;
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}
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}
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return 0;
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}
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bool SPUInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, unsigned SrcReg,
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const TargetRegisterClass *DestRC,
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const TargetRegisterClass *SrcRC) const
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{
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// We support cross register class moves for our aliases, such as R3 in any
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// reg class to any other reg class containing R3. This is required because
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// we instruction select bitconvert i64 -> f64 as a noop for example, so our
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// types have no specific meaning.
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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if (DestRC == SPU::R8CRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRr8), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::R16CRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRr16), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::R32CRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRr32), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::R32FPRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRf32), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::R64CRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRr64), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::R64FPRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRf64), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::GPRCRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRr128), DestReg).addReg(SrcReg);
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} else if (DestRC == SPU::VECREGRegisterClass) {
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BuildMI(MBB, MI, DL, get(SPU::LRv16i8), DestReg).addReg(SrcReg);
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} else {
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// Attempt to copy unknown/unsupported register class!
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return false;
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}
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return true;
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}
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void
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SPUInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned SrcReg, bool isKill, int FrameIdx,
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const TargetRegisterClass *RC) const
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{
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unsigned opc;
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bool isValidFrameIdx = (FrameIdx < SPUFrameInfo::maxFrameOffset());
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if (RC == SPU::GPRCRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr128 : SPU::STQXr128);
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} else if (RC == SPU::R64CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64);
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} else if (RC == SPU::R64FPRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr64 : SPU::STQXr64);
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} else if (RC == SPU::R32CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32);
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} else if (RC == SPU::R32FPRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr32 : SPU::STQXr32);
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} else if (RC == SPU::R16CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr16 : SPU::STQXr16);
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} else if (RC == SPU::R8CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::STQDr8 : SPU::STQXr8);
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} else if (RC == SPU::VECREGRegisterClass) {
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opc = (isValidFrameIdx) ? SPU::STQDv16i8 : SPU::STQXv16i8;
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} else {
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llvm_unreachable("Unknown regclass!");
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}
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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addFrameReference(BuildMI(MBB, MI, DL, get(opc))
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.addReg(SrcReg, getKillRegState(isKill)), FrameIdx);
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}
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void
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SPUInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, int FrameIdx,
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const TargetRegisterClass *RC) const
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{
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unsigned opc;
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bool isValidFrameIdx = (FrameIdx < SPUFrameInfo::maxFrameOffset());
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if (RC == SPU::GPRCRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr128 : SPU::LQXr128);
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} else if (RC == SPU::R64CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64);
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} else if (RC == SPU::R64FPRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr64 : SPU::LQXr64);
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} else if (RC == SPU::R32CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32);
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} else if (RC == SPU::R32FPRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr32 : SPU::LQXr32);
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} else if (RC == SPU::R16CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr16 : SPU::LQXr16);
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} else if (RC == SPU::R8CRegisterClass) {
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opc = (isValidFrameIdx ? SPU::LQDr8 : SPU::LQXr8);
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} else if (RC == SPU::VECREGRegisterClass) {
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opc = (isValidFrameIdx) ? SPU::LQDv16i8 : SPU::LQXv16i8;
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} else {
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llvm_unreachable("Unknown regclass in loadRegFromStackSlot!");
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}
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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addFrameReference(BuildMI(MBB, MI, DL, get(opc), DestReg), FrameIdx);
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}
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//! Return true if the specified load or store can be folded
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bool
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SPUInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
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const SmallVectorImpl<unsigned> &Ops) const {
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if (Ops.size() != 1) return false;
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// Make sure this is a reg-reg copy.
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unsigned Opc = MI->getOpcode();
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switch (Opc) {
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case SPU::ORv16i8:
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case SPU::ORv8i16:
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case SPU::ORv4i32:
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case SPU::ORv2i64:
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case SPU::ORr8:
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case SPU::ORr16:
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case SPU::ORr32:
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case SPU::ORr64:
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case SPU::ORf32:
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case SPU::ORf64:
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if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg())
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return true;
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break;
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}
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return false;
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}
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/// foldMemoryOperand - SPU, like PPC, can only fold spills into
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/// copy instructions, turning them into load/store instructions.
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MachineInstr *
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SPUInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
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MachineInstr *MI,
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const SmallVectorImpl<unsigned> &Ops,
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int FrameIndex) const
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{
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if (Ops.size() != 1) return 0;
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unsigned OpNum = Ops[0];
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unsigned Opc = MI->getOpcode();
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MachineInstr *NewMI = 0;
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switch (Opc) {
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case SPU::ORv16i8:
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case SPU::ORv8i16:
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case SPU::ORv4i32:
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case SPU::ORv2i64:
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case SPU::ORr8:
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case SPU::ORr16:
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case SPU::ORr32:
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case SPU::ORr64:
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case SPU::ORf32:
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case SPU::ORf64:
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if (OpNum == 0) { // move -> store
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unsigned InReg = MI->getOperand(1).getReg();
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bool isKill = MI->getOperand(1).isKill();
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bool isUndef = MI->getOperand(1).isUndef();
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if (FrameIndex < SPUFrameInfo::maxFrameOffset()) {
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MachineInstrBuilder MIB = BuildMI(MF, MI->getDebugLoc(),
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get(SPU::STQDr32));
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MIB.addReg(InReg, getKillRegState(isKill) | getUndefRegState(isUndef));
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NewMI = addFrameReference(MIB, FrameIndex);
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}
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} else { // move -> load
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unsigned OutReg = MI->getOperand(0).getReg();
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bool isDead = MI->getOperand(0).isDead();
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bool isUndef = MI->getOperand(0).isUndef();
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MachineInstrBuilder MIB = BuildMI(MF, MI->getDebugLoc(), get(Opc));
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MIB.addReg(OutReg, RegState::Define | getDeadRegState(isDead) |
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getUndefRegState(isUndef));
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Opc = (FrameIndex < SPUFrameInfo::maxFrameOffset())
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? SPU::STQDr32 : SPU::STQXr32;
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NewMI = addFrameReference(MIB, FrameIndex);
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break;
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}
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}
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return NewMI;
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}
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//! Branch analysis
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/*!
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\note This code was kiped from PPC. There may be more branch analysis for
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CellSPU than what's currently done here.
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*/
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bool
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SPUInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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SmallVectorImpl<MachineOperand> &Cond,
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bool AllowModify) const {
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// If the block has no terminators, it just falls into the block after it.
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MachineBasicBlock::iterator I = MBB.end();
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if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
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return false;
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|
|
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// Get the last instruction in the block.
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MachineInstr *LastInst = I;
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|
|
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// If there is only one terminator instruction, process it.
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if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
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if (isUncondBranch(LastInst)) {
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TBB = LastInst->getOperand(0).getMBB();
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return false;
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} else if (isCondBranch(LastInst)) {
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// Block ends with fall-through condbranch.
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TBB = LastInst->getOperand(1).getMBB();
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DEBUG(errs() << "Pushing LastInst: ");
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DEBUG(LastInst->dump());
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Cond.push_back(MachineOperand::CreateImm(LastInst->getOpcode()));
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Cond.push_back(LastInst->getOperand(0));
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return false;
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|
}
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|
// Otherwise, don't know what this is.
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return true;
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|
}
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|
|
|
// Get the instruction before it if it's a terminator.
|
|
MachineInstr *SecondLastInst = I;
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|
|
|
// If there are three terminators, we don't know what sort of block this is.
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if (SecondLastInst && I != MBB.begin() &&
|
|
isUnpredicatedTerminator(--I))
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return true;
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|
|
|
// If the block ends with a conditional and unconditional branch, handle it.
|
|
if (isCondBranch(SecondLastInst) && isUncondBranch(LastInst)) {
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TBB = SecondLastInst->getOperand(1).getMBB();
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|
DEBUG(errs() << "Pushing SecondLastInst: ");
|
|
DEBUG(SecondLastInst->dump());
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|
Cond.push_back(MachineOperand::CreateImm(SecondLastInst->getOpcode()));
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|
Cond.push_back(SecondLastInst->getOperand(0));
|
|
FBB = LastInst->getOperand(0).getMBB();
|
|
return false;
|
|
}
|
|
|
|
// If the block ends with two unconditional branches, handle it. The second
|
|
// one is not executed, so remove it.
|
|
if (isUncondBranch(SecondLastInst) && isUncondBranch(LastInst)) {
|
|
TBB = SecondLastInst->getOperand(0).getMBB();
|
|
I = LastInst;
|
|
if (AllowModify)
|
|
I->eraseFromParent();
|
|
return false;
|
|
}
|
|
|
|
// Otherwise, can't handle this.
|
|
return true;
|
|
}
|
|
|
|
unsigned
|
|
SPUInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
|
|
MachineBasicBlock::iterator I = MBB.end();
|
|
if (I == MBB.begin())
|
|
return 0;
|
|
--I;
|
|
if (!isCondBranch(I) && !isUncondBranch(I))
|
|
return 0;
|
|
|
|
// Remove the first branch.
|
|
DEBUG(errs() << "Removing branch: ");
|
|
DEBUG(I->dump());
|
|
I->eraseFromParent();
|
|
I = MBB.end();
|
|
if (I == MBB.begin())
|
|
return 1;
|
|
|
|
--I;
|
|
if (!(isCondBranch(I) || isUncondBranch(I)))
|
|
return 1;
|
|
|
|
// Remove the second branch.
|
|
DEBUG(errs() << "Removing second branch: ");
|
|
DEBUG(I->dump());
|
|
I->eraseFromParent();
|
|
return 2;
|
|
}
|
|
|
|
unsigned
|
|
SPUInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
|
|
MachineBasicBlock *FBB,
|
|
const SmallVectorImpl<MachineOperand> &Cond) const {
|
|
// FIXME this should probably have a DebugLoc argument
|
|
DebugLoc dl = DebugLoc::getUnknownLoc();
|
|
// Shouldn't be a fall through.
|
|
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
|
|
assert((Cond.size() == 2 || Cond.size() == 0) &&
|
|
"SPU branch conditions have two components!");
|
|
|
|
// One-way branch.
|
|
if (FBB == 0) {
|
|
if (Cond.empty()) {
|
|
// Unconditional branch
|
|
MachineInstrBuilder MIB = BuildMI(&MBB, dl, get(SPU::BR));
|
|
MIB.addMBB(TBB);
|
|
|
|
DEBUG(errs() << "Inserted one-way uncond branch: ");
|
|
DEBUG((*MIB).dump());
|
|
} else {
|
|
// Conditional branch
|
|
MachineInstrBuilder MIB = BuildMI(&MBB, dl, get(Cond[0].getImm()));
|
|
MIB.addReg(Cond[1].getReg()).addMBB(TBB);
|
|
|
|
DEBUG(errs() << "Inserted one-way cond branch: ");
|
|
DEBUG((*MIB).dump());
|
|
}
|
|
return 1;
|
|
} else {
|
|
MachineInstrBuilder MIB = BuildMI(&MBB, dl, get(Cond[0].getImm()));
|
|
MachineInstrBuilder MIB2 = BuildMI(&MBB, dl, get(SPU::BR));
|
|
|
|
// Two-way Conditional Branch.
|
|
MIB.addReg(Cond[1].getReg()).addMBB(TBB);
|
|
MIB2.addMBB(FBB);
|
|
|
|
DEBUG(errs() << "Inserted conditional branch: ");
|
|
DEBUG((*MIB).dump());
|
|
DEBUG(errs() << "part 2: ");
|
|
DEBUG((*MIB2).dump());
|
|
return 2;
|
|
}
|
|
}
|
|
|
|
//! Reverses a branch's condition, returning false on success.
|
|
bool
|
|
SPUInstrInfo::ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond)
|
|
const {
|
|
// Pretty brainless way of inverting the condition, but it works, considering
|
|
// there are only two conditions...
|
|
static struct {
|
|
unsigned Opc; //! The incoming opcode
|
|
unsigned RevCondOpc; //! The reversed condition opcode
|
|
} revconds[] = {
|
|
{ SPU::BRNZr32, SPU::BRZr32 },
|
|
{ SPU::BRNZv4i32, SPU::BRZv4i32 },
|
|
{ SPU::BRZr32, SPU::BRNZr32 },
|
|
{ SPU::BRZv4i32, SPU::BRNZv4i32 },
|
|
{ SPU::BRHNZr16, SPU::BRHZr16 },
|
|
{ SPU::BRHNZv8i16, SPU::BRHZv8i16 },
|
|
{ SPU::BRHZr16, SPU::BRHNZr16 },
|
|
{ SPU::BRHZv8i16, SPU::BRHNZv8i16 }
|
|
};
|
|
|
|
unsigned Opc = unsigned(Cond[0].getImm());
|
|
// Pretty dull mapping between the two conditions that SPU can generate:
|
|
for (int i = sizeof(revconds)/sizeof(revconds[0]) - 1; i >= 0; --i) {
|
|
if (revconds[i].Opc == Opc) {
|
|
Cond[0].setImm(revconds[i].RevCondOpc);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|