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Fixed deadstoreelimination bug where negative indices were incorrectly causing the optimisation to occur
Turns out long long + unsigned long long is unsigned. Doh! Fixes http://llvm.org/bugs/show_bug.cgi?id=11455 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145731 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -416,7 +416,7 @@ static OverwriteResult isOverwrite(const AliasAnalysis::Location &Later,
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// writes to addresses which will definitely be overwritten later
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if (LaterOff > EarlierOff &&
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LaterOff < int64_t(EarlierOff + Earlier.Size) &&
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LaterOff + Later.Size >= EarlierOff + Earlier.Size)
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int64_t(LaterOff + Later.Size) >= int64_t(EarlierOff + Earlier.Size))
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return OverwriteEnd;
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// Otherwise, they don't completely overlap.
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@ -76,3 +76,20 @@ entry:
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
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%struct.trapframe = type { i64, i64, i64 }
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; bugzilla 11455 - make sure negative GEP's don't break this optimisation
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; CHECK: @cpu_lwp_fork
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define void @cpu_lwp_fork(%struct.trapframe* %md_regs, i64 %pcb_rsp0) nounwind uwtable noinline ssp {
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entry:
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%0 = inttoptr i64 %pcb_rsp0 to %struct.trapframe*
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%add.ptr = getelementptr inbounds %struct.trapframe* %0, i64 -1
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%1 = bitcast %struct.trapframe* %add.ptr to i8*
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%2 = bitcast %struct.trapframe* %md_regs to i8*
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 24, i32 1, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 24, i32 1, i1 false)
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%tf_trapno = getelementptr inbounds %struct.trapframe* %0, i64 -1, i32 1
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store i64 3, i64* %tf_trapno, align 8
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ret void
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}
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