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https://github.com/c64scene-ar/llvm-6502.git
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7aeb9b5e4c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83828 91177308-0d34-0410-b5e6-96231b3b80d8
37 lines
1.4 KiB
LLVM
37 lines
1.4 KiB
LLVM
; Tests to make sure elimination of casts is working correctly
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; RUN: opt < %s -instcombine -S | FileCheck %s
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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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; CHECK: %tmp.upgrd.32 = call i16 @llvm.bswap.i16(i16 %a)
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; CHECK: ret i16 %tmp.upgrd.32
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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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; CHECK: %tmp21 = lshr i16 %a, 9
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; CHECK: %tmp5 = shl i16 %a, 8
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; CHECK: %tmp.upgrd.32 = or i16 %tmp21, %tmp5
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; CHECK: ret i16 %tmp.upgrd.32
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}
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; PR1263
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define i32* @test3(i32* %tmp1) {
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%tmp64 = bitcast i32* %tmp1 to { i32 }* ; <{ i32 }*> [#uses=1]
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%tmp65 = getelementptr { i32 }* %tmp64, i32 0, i32 0 ; <i32*> [#uses=1]
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ret i32* %tmp65
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; CHECK: ret i32* %tmp1
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}
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