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When LiveVariables is adding implicit-def to model "partial dead", add the earlyclobber marker if the superreg def has it.

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llvm-svn: 84153
This commit is contained in:
Evan Cheng 2009-10-14 23:39:27 +00:00
parent f57950d75b
commit f46b194f84
2 changed files with 27 additions and 1 deletions
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13
lib/CodeGen/LiveVariables.cpp
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@ -323,10 +323,21 @@ bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *MI) {
// The last partial def kills the register.
LastPartDef->addOperand(MachineOperand::CreateReg(Reg, false/*IsDef*/,
true/*IsImp*/, true/*IsKill*/));
else
else {
MachineOperand *MO =
LastRefOrPartRef->findRegisterDefOperand(Reg, false, TRI);
bool NeedEC = MO->isEarlyClobber() && MO->getReg() != Reg;
// If the last reference is the last def, then it's not used at all.
// That is, unless we are currently processing the last reference itself.
LastRefOrPartRef->addRegisterDead(Reg, TRI, true);
if (NeedEC) {
// If we are adding a subreg def and the superreg def is marked early
// clobber, add an early clobber marker to the subreg def.
MO = LastRefOrPartRef->findRegisterDefOperand(Reg);
if (MO)
MO->setIsEarlyClobber();
}
}
} else if (!PhysRegUse[Reg]) {
// Partial uses. Mark register def dead and add implicit def of
// sub-registers which are used.

15
test/CodeGen/X86/2009-10-14-LiveVariablesBug.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llc < %s -mtriple=i386-apple-darwin
; rdar://7299435
@i = internal global i32 0 ; <i32*> [#uses=1]
@llvm.used = appending global [1 x i8*] [i8* bitcast (void (i16)* @foo to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
define void @foo(i16 signext %source) nounwind ssp {
entry:
%source_addr = alloca i16, align 2 ; <i16*> [#uses=2]
store i16 %source, i16* %source_addr
store i32 4, i32* @i, align 4
call void asm sideeffect "# top of block", "~{dirflag},~{fpsr},~{flags},~{edi},~{esi},~{edx},~{ecx},~{eax}"() nounwind
%asmtmp = call i16 asm sideeffect "movw $1, $0", "=={ax},*m,~{dirflag},~{fpsr},~{flags},~{memory}"(i16* %source_addr) nounwind ; <i16> [#uses=0]
ret void
}