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VirtRegRewriter assertion fix.

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Apparently it's ok for multiple operands to "kill" the same register.
Fixes PR9237.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126190 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-02-22 06:52:56 +00:00
parent 4ecc82e592
commit fcfcdbc86a
2 changed files with 54 additions and 2 deletions
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6
lib/CodeGen/VirtRegRewriter.cpp
View File

@ -478,7 +478,8 @@ static void ResurrectConfirmedKill(unsigned Reg, const TargetRegisterInfo* TRI,
if (!RegKills[KReg]) if (!RegKills[KReg])
return; return;
assert(KillOps[KReg] == KillOp && "invalid superreg kill flags"); assert(KillOps[KReg]->getParent() == KillOp->getParent() &&
"invalid superreg kill flags");
KillOps[KReg] = NULL; KillOps[KReg] = NULL;
RegKills.reset(KReg); RegKills.reset(KReg);
@ -487,7 +488,8 @@ static void ResurrectConfirmedKill(unsigned Reg, const TargetRegisterInfo* TRI,
for (const unsigned *SR = TRI->getSubRegisters(KReg); *SR; ++SR) { for (const unsigned *SR = TRI->getSubRegisters(KReg); *SR; ++SR) {
DEBUG(dbgs() << " Resurrect subreg " << TRI->getName(*SR) << "\n"); DEBUG(dbgs() << " Resurrect subreg " << TRI->getName(*SR) << "\n");
assert(KillOps[*SR] == KillOp && "invalid subreg kill flags"); assert(KillOps[*SR]->getParent() == KillOp->getParent() &&
"invalid subreg kill flags");
KillOps[*SR] = NULL; KillOps[*SR] = NULL;
RegKills.reset(*SR); RegKills.reset(*SR);
} }

50
test/CodeGen/X86/2011-02-21-VirtRegRewriter-KillSubReg.ll Normal file
View File

@ -0,0 +1,50 @@
; RUN: llc < %s -O2 -march=x86 -mtriple=i386-pc-linux-gnu -relocation-model=pic | FileCheck %s
; PR9237: Assertion in VirtRegRewriter.cpp, ResurrectConfirmedKill
; `KillOps[*SR] == KillOp && "invalid subreg kill flags"'
%t = type { i32 }
define i32 @foo(%t* %s) nounwind {
entry:
br label %if.then735
if.then735:
%call747 = call i32 undef(%t* %s, i8* null, i8* undef, i32 128, i8* undef, i32 516) nounwind
br i1 undef, label %if.then751, label %if.then758
if.then751:
unreachable
if.then758:
%add761 = add i32 %call747, 4
%add763 = add i32 %add761, %call747
%add.ptr768 = getelementptr inbounds [516 x i8]* null, i32 0, i32 %add761
br i1 undef, label %cond.false783, label %cond.true771
cond.true771:
%call782 = call i8* @__memmove_chk(i8* %add.ptr768, i8* undef, i32 %call747, i32 undef)
br label %cond.end791
; CHECK: calll __memmove_chk
cond.false783:
%call.i1035 = call i8* @__memmove_chk(i8* %add.ptr768, i8* undef, i32 %call747, i32 undef) nounwind
br label %cond.end791
cond.end791:
%conv801 = trunc i32 %call747 to i8
%add.ptr822.sum = add i32 %call747, 3
%arrayidx833 = getelementptr inbounds [516 x i8]* null, i32 0, i32 %add.ptr822.sum
store i8 %conv801, i8* %arrayidx833, align 1
%cmp841 = icmp eq i8* undef, null
br i1 %cmp841, label %if.end849, label %if.then843
if.then843:
unreachable
if.end849:
%call921 = call i32 undef(%t* %s, i8* undef, i8* undef, i32 %add763) nounwind
unreachable
}
declare i8* @__memmove_chk(i8*, i8*, i32, i32) nounwind