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47 lines
1.5 KiB
47 lines
1.5 KiB
4 months ago
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; RUN: opt < %s -indvars -S -o - | FileCheck %s
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; When eliminating the overflow intrinsic the indvars pass would incorrectly
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; return a false Modified status. This was caught by the pass return
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; status check that is hidden under EXPENSIVE_CHECKS.
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; CHECK-LABEL: for.body:
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; CHECK-NEXT: %0 = phi i16 [ %1, %for.body ], [ undef, %for.body.preheader ]
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; CHECK-NEXT: %1 = add nsw i16 %0, -1
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; CHECK-NEXT: %cmp = icmp sgt i16 %1, 0
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; CHECK-NEXT: call void @llvm.assume(i1 %cmp)
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; Function Attrs: nounwind
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define void @foo() #0 {
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entry:
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%cmp1 = icmp sgt i16 undef, 0
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br i1 %cmp1, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %entry
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%0 = phi i16 [ %2, %for.body ], [ undef, %for.body.preheader ]
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%1 = call { i16, i1 } @llvm.sadd.with.overflow.i16(i16 %0, i16 -1)
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%2 = extractvalue { i16, i1 } %1, 0
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%cmp = icmp sgt i16 %2, 0
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call void @llvm.assume(i1 %cmp)
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br label %for.body
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for.end: ; preds = %entry
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ret void
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare { i16, i1 } @llvm.sadd.with.overflow.i16(i16, i16) #1
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; Function Attrs: nounwind willreturn
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declare void @llvm.assume(i1) #2
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone speculatable willreturn }
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attributes #2 = { nounwind willreturn }
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!llvm.ident = !{!0}
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!0 = !{!"clang version 12.0.0"}
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