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