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InstSimplify: X >> X -> 0

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185973 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2013-07-09 22:01:22 +00:00
parent e4e742a62d
commit 8c5c6f0e09
3 changed files with 27 additions and 3 deletions
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6
test/Transforms/InstCombine/div-shift.ll
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@@ -54,9 +54,9 @@ define i32 @t5(i1 %x, i1 %y, i32 %V) nounwind {
; CHECK: t5
; CHECK-NOT: udiv
; CHECK-NEXT: [[SEL1:%.*]] = select i1 %x, i32 5, i32 6
; CHECK-NEXT: [[SEL2:%.*]] = select i1 %y, i32 [[SEL1]], i32 %V
; CHECK-NEXT: [[LSHR:%.*]] = lshr i32 %V, [[SEL2]]
; CHECK-NEXT: ret i32 [[LSHR]]
; CHECK-NEXT: [[LSHR:%.*]] = lshr i32 %V, [[SEL1]]
; CHECK-NEXT: [[SEL2:%.*]] = select i1 %y, i32 [[LSHR]], i32 0
; CHECK-NEXT: ret i32 [[SEL2]]
%1 = shl i32 1, %V
%2 = select i1 %x, i32 32, i32 64
%3 = select i1 %y, i32 %2, i32 %1