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Turn some insert_subreg, extract_subreg, subreg_to_reg into implicit_defs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78151 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-08-05 03:53:14 +00:00
parent aa289d5e7f
commit 6ade93bbdc
3 changed files with 28 additions and 8 deletions
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32
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -106,6 +106,23 @@ void LiveIntervals::releaseMemory() {
}
}
static bool CanTurnIntoImplicitDef(MachineInstr *MI, unsigned Reg,
const TargetInstrInfo *tii_) {
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg)
return true;
if ((MI->getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
MI->getOpcode() == TargetInstrInfo::SUBREG_TO_REG) &&
MI->getOperand(2).getReg() == Reg)
return true;
if (MI->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG &&
MI->getOperand(1).getReg() == Reg)
return true;
return false;
}
/// processImplicitDefs - Process IMPLICIT_DEF instructions and make sure
/// there is one implicit_def for each use. Add isUndef marker to
/// implicit_def defs and their uses.
@ -132,7 +149,7 @@ void LiveIntervals::processImplicitDefs() {
bool ChangedToImpDef = false;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand& MO = MI->getOperand(i);
if (!MO.isReg() || !MO.isUse())
if (!MO.isReg() || !MO.isUse() || MO.isUndef())
continue;
unsigned Reg = MO.getReg();
if (!Reg)
@ -140,9 +157,7 @@ void LiveIntervals::processImplicitDefs() {
if (!ImpDefRegs.count(Reg))
continue;
// Use is a copy, just turn it into an implicit_def.
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) &&
Reg == SrcReg) {
if (CanTurnIntoImplicitDef(MI, Reg, tii_)) {
bool isKill = MO.isKill();
MI->setDesc(tii_->get(TargetInstrInfo::IMPLICIT_DEF));
for (int j = MI->getNumOperands() - 1, ee = 0; j > ee; --j)
@ -154,9 +169,16 @@ void LiveIntervals::processImplicitDefs() {
}
MO.setIsUndef();
if (MO.isKill() || MI->isRegTiedToDefOperand(i))
if (MO.isKill() || MI->isRegTiedToDefOperand(i)) {
// Make sure other uses of
for (unsigned j = i+1; j != e; ++j) {
MachineOperand &MOJ = MI->getOperand(j);
if (MOJ.isReg() && MOJ.isUse() && MOJ.getReg() == Reg)
MOJ.setIsUndef();
}
ImpDefRegs.erase(Reg);
}
}
if (ChangedToImpDef) {
// Backtrack to process this new implicit_def.

1
lib/CodeGen/LowerSubregs.cpp
View File

@ -119,6 +119,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
"Extract supperg source must be a physical register");
assert(TargetRegisterInfo::isPhysicalRegister(DstReg) &&
"Extract destination must be in a physical register");
assert(SrcReg && "invalid subregister index for register");
DOUT << "subreg: CONVERTING: " << *MI;

3
test/CodeGen/Blackfin/printf2.ll
View File

@ -1,7 +1,4 @@
; RUN: llvm-as < %s | llc -march=bfin
; XFAIL: *
; Assertion failed: (isUsed(Reg) && "Using an undefined register!"),
; function forward, file RegisterScavenging.cpp, line 182.
declare i32 @printf(i8*, ...)