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df772f257f
zext(icmp). It may be able to optimize that away. This fixes one of the cases in PR5438. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88830 91177308-0d34-0410-b5e6-96231b3b80d8
29 lines
866 B
LLVM
29 lines
866 B
LLVM
; RUN: opt %S -instcombine -S | FileCheck %S
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; PR5438
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; TODO: This should also optimize down.
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;define i32 @bar(i32 %a, i32 %b) nounwind readnone {
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;entry:
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; %0 = icmp sgt i32 %a, -1 ; <i1> [#uses=1]
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; %1 = icmp slt i32 %b, 0 ; <i1> [#uses=1]
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; %2 = xor i1 %1, %0 ; <i1> [#uses=1]
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; %3 = zext i1 %2 to i32 ; <i32> [#uses=1]
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; ret i32 %3
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;}
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define i32 @qaz(i32 %a, i32 %b) nounwind readnone {
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; CHECK: @qaz
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entry:
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; CHECK: xor i32 %a, %b
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; CHECK; lshr i32 %0, 31
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; CHECK: xor i32 %1, 1
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%0 = lshr i32 %a, 31 ; <i32> [#uses=1]
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%1 = lshr i32 %b, 31 ; <i32> [#uses=1]
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%2 = icmp eq i32 %0, %1 ; <i1> [#uses=1]
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%3 = zext i1 %2 to i32 ; <i32> [#uses=1]
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ret i32 %3
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; CHECK-NOT: icmp
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; CHECK-NOT: zext
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; CHECK: ret i32 %2
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}
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