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cc08feb999
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34869 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
996 B
LLVM
25 lines
996 B
LLVM
; Tests to make sure elimination of casts is working correctly
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; RUN: llvm-as < %s | opt -instcombine -disable-output &&
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | notcast
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define i16 @test1(i16 %a) {
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%tmp = zext i16 %a to i32 ; <i32> [#uses=2]
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%tmp21 = lshr i32 %tmp, 8 ; <i32> [#uses=1]
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%tmp5 = shl i32 %tmp, 8 ; <i32> [#uses=1]
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%tmp.upgrd.32 = or i32 %tmp21, %tmp5 ; <i32> [#uses=1]
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%tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16 ; <i16> [#uses=1]
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ret i16 %tmp.upgrd.3
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}
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define i16 @test2(i16 %a) {
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%tmp = zext i16 %a to i32 ; <i32> [#uses=2]
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%tmp21 = lshr i32 %tmp, 9 ; <i32> [#uses=1]
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%tmp5 = shl i32 %tmp, 8 ; <i32> [#uses=1]
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%tmp.upgrd.32 = or i32 %tmp21, %tmp5 ; <i32> [#uses=1]
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%tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16 ; <i16> [#uses=1]
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ret i16 %tmp.upgrd.3
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}
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