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[InstCombine][test] add test for potential miscompile with constant expression; NFC (PR50906)

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This commit is contained in:
Sanjay Patel 2021-06-28 15:57:38 -04:00
parent 520d135b42
commit 3442700c7c
1 changed files with 29 additions and 0 deletions
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29
test/Transforms/InstCombine/indexed-gep-compares.ll
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@ -249,6 +249,35 @@ bb10:
ret i1 %cmp
}
; FIXME:
; It is not generally safe to hoist an expression (sdiv) that may trap.
define i1 @PR50906() {
; CHECK-LABEL: @PR50906(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[CMP:%.*]] = phi i1 [ icmp sgt (i32 sdiv (i32 7, i32 ptrtoint (i1 ()* @PR50906 to i32)), i32 1), [[NEXT:%.*]] ], [ icmp sgt (i32 sdiv (i32 7, i32 ptrtoint (i1 ()* @PR50906 to i32)), i32 0), [[ENTRY:%.*]] ]
; CHECK-NEXT: br label [[NEXT]]
; CHECK: next:
; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i1 [[CMP]]
;
entry:
br label %loop
loop:
%phi = phi i32 [ 0, %entry ], [ 1, %next ]
br label %next
next:
%cmp = icmp sgt i32 sdiv (i32 7, i32 ptrtoint (i1 ()* @PR50906 to i32)), %phi
br i1 %cmp, label %exit, label %loop
exit:
ret i1 %cmp
}
declare i32 @__gxx_personality_v0(...)