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[InstSimplify] Add test for PR61312 (NFC)

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This commit is contained in:
Nikita Popov 2023-03-10 10:29:28 +01:00
parent 421c098b32
commit 8bcdc503eb
1 changed files with 32 additions and 0 deletions
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32
llvm/test/Transforms/InstSimplify/phi.ll
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@ -152,3 +152,35 @@ EXIT:
%r = phi i8 [poison, %A], [poison, %B]
ret i8 %r
}
; FIXME: This is a miscompile.
define i32 @pr61312() {
; CHECK-LABEL: @pr61312(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[A_0:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ [[DEC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i32 [[A_0]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_INC]], label [[FOR_END:%.*]]
; CHECK: for.inc:
; CHECK-NEXT: [[DEC]] = add nsw i32 [[A_0]], -1
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.end:
; CHECK-NEXT: ret i32 -1
;
entry:
br label %for.cond
for.cond:
%a.0 = phi i32 [ 2, %entry ], [ %dec, %for.inc ]
%cmp = icmp sge i32 %a.0, 0
br i1 %cmp, label %for.inc, label %for.end
for.inc:
%dec = add nsw i32 %a.0, -1
br label %for.cond
for.end:
%rem = srem i32 -1, %a.0
ret i32 %rem
}