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Do not try to optimize a copy that has already been marked for deletion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102027 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-04-21 20:57:54 +00:00
parent 708e474c2f
commit e3dd8550c6
2 changed files with 17 additions and 1 deletions
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3
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -804,7 +804,8 @@ SimpleRegisterCoalescing::UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg,
CopySrcReg == SrcReg && CopyDstReg != UseDstReg) {
// If the use is a copy and it won't be coalesced away, and its source
// is defined by a trivial computation, try to rematerialize it instead.
if (ReMaterializeTrivialDef(li_->getInterval(SrcReg), CopyDstReg,
if (!JoinedCopies.count(UseMI) &&
ReMaterializeTrivialDef(li_->getInterval(SrcReg), CopyDstReg,
CopyDstSubIdx, UseMI))
continue;
}

15
test/CodeGen/X86/2010-04-21-CoalescerBug.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin
; rdar://7886733
%struct.CMTime = type <{ i64, i32, i32, i64 }>
%struct.CMTimeMapping = type { %struct.CMTimeRange, %struct.CMTimeRange }
%struct.CMTimeRange = type { %struct.CMTime, %struct.CMTime }
define void @t(%struct.CMTimeMapping* noalias nocapture sret %agg.result) nounwind optsize ssp {
entry:
%agg.result1 = bitcast %struct.CMTimeMapping* %agg.result to i8* ; <i8*> [#uses=1]
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %agg.result1, i8* null, i64 96, i32 4, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind