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[RegisterCoalescer] Reset VNInfo def when copying segments over 

llvm-svn: 339788
This commit is contained in:
Krzysztof Parzyszek 2018-08-15 16:21:53 +00:00
parent 43ccc1c63d
commit 88d267d094
2 changed files with 57 additions and 2 deletions
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8
llvm/lib/CodeGen/RegisterCoalescer.cpp
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@ -686,13 +686,16 @@ bool RegisterCoalescer::hasOtherReachingDefs(LiveInterval &IntA,
/// Copy segments with value number @p SrcValNo from liverange @p Src to live
/// range @Dst and use value number @p DstValNo there.
static void addSegmentsWithValNo(LiveRange &Dst, VNInfo *DstValNo,
static bool addSegmentsWithValNo(LiveRange &Dst, VNInfo *DstValNo,
const LiveRange &Src, const VNInfo *SrcValNo) {
bool Changed = false;
for (const LiveRange::Segment &S : Src.segments) {
if (S.valno != SrcValNo)
continue;
Dst.addSegment(LiveRange::Segment(S.start, S.end, DstValNo));
Changed = true;
}
return Changed;
}
bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
@ -889,7 +892,8 @@ bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
? SR.getNextValue(CopyIdx, Allocator)
: SR.getVNInfoAt(CopyIdx);
assert(BSubValNo != nullptr);
addSegmentsWithValNo(SR, BSubValNo, SA, ASubValNo);
if (addSegmentsWithValNo(SR, BSubValNo, SA, ASubValNo))
BSubValNo->def = ASubValNo->def;
});
}
}

51
llvm/test/CodeGen/SystemZ/subregliveness-03.ll Normal file
View File

@ -0,0 +1,51 @@
; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -systemz-subreg-liveness < %s | FileCheck %s
; Check for successful compilation.
; CHECK: aghi %r15, -160
target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"
target triple = "s390x-ibm-linux"
%0 = type { i8*, i32, i32 }
declare i8* @Perl_sv_grow(%0*, i64) #0
; Function Attrs: nounwind
define signext i32 @Perl_yylex() #1 {
bb:
br label %bb1
bb1: ; preds = %bb3, %bb
%tmp = phi i8* [ %tmp8, %bb3 ], [ undef, %bb ]
%tmp2 = icmp eq i8 undef, 0
br i1 %tmp2, label %bb9, label %bb3
bb3: ; preds = %bb1
%tmp4 = ptrtoint i8* %tmp to i64
%tmp5 = sub i64 %tmp4, 0
%tmp6 = shl i64 %tmp5, 32
%tmp7 = ashr exact i64 %tmp6, 32
%tmp8 = getelementptr inbounds i8, i8* null, i64 %tmp7
br label %bb1
bb9: ; preds = %bb1
br i1 undef, label %bb10, label %bb15
bb10: ; preds = %bb9
%tmp11 = ptrtoint i8* %tmp to i64
%tmp12 = sub i64 %tmp11, 0
%tmp13 = call i8* @Perl_sv_grow(%0* nonnull undef, i64 undef) #2
%tmp14 = getelementptr inbounds i8, i8* %tmp13, i64 %tmp12
br label %bb15
bb15: ; preds = %bb10, %bb9
%tmp16 = phi i8* [ %tmp14, %bb10 ], [ %tmp, %bb9 ]
%tmp17 = call i8* @Perl_uvuni_to_utf8(i8* %tmp16, i64 undef) #2
unreachable
}
declare i8* @Perl_uvuni_to_utf8(i8*, i64) #0
attributes #0 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="z13" "target-features"="+transactional-execution,+vector" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="z13" "target-features"="+transactional-execution,+vector" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind }