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Teach ComputeMaskedBits about nsw on add. I don't think there's anything we can

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do with nuw here, but sub and mul should be given similar treatment.
Fixes PR9343 #15!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-03-11 09:00:19 +00:00
parent 6fd2472b1b
commit b69050a94c
2 changed files with 24 additions and 0 deletions
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10
test/Transforms/InstSimplify/compare.ll
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@@ -261,6 +261,16 @@ define i1 @srem1(i32 %X) {
; CHECK: ret i1 false
}
; PR9343 #15
; CHECK: @srem2
; CHECK: ret i1 false
define i1 @srem2(i16 %X, i32 %Y) {
%A = zext i16 %X to i32
%B = add nsw i32 %A, 1
%C = srem i32 %B, %Y
%D = icmp slt i32 %C, 0
ret i1 %D
}
define i1 @udiv1(i32 %X) {
; CHECK: @udiv1
%A = udiv i32 %X, 1000000