57 lines
1.5 KiB
LLVM
57 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=thumb-eabi -mattr=+v6 %s -o - | FileCheck %s
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define i32 @test1(i32 %X) nounwind {
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; CHECK: test1
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; CHECK: rev16 r0, r0
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%tmp1 = lshr i32 %X, 8
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%X15 = bitcast i32 %X to i32
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%tmp4 = shl i32 %X15, 8
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%tmp2 = and i32 %tmp1, 16711680
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%tmp5 = and i32 %tmp4, -16777216
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%tmp9 = and i32 %tmp1, 255
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%tmp13 = and i32 %tmp4, 65280
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%tmp6 = or i32 %tmp5, %tmp2
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%tmp10 = or i32 %tmp6, %tmp13
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%tmp14 = or i32 %tmp10, %tmp9
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ret i32 %tmp14
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}
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define i32 @test2(i32 %X) nounwind {
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; CHECK: test2
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; CHECK: revsh r0, r0
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%tmp1 = lshr i32 %X, 8
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%tmp1.upgrd.1 = trunc i32 %tmp1 to i16
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%tmp3 = trunc i32 %X to i16
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%tmp2 = and i16 %tmp1.upgrd.1, 255
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%tmp4 = shl i16 %tmp3, 8
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%tmp5 = or i16 %tmp2, %tmp4
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%tmp5.upgrd.2 = sext i16 %tmp5 to i32
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ret i32 %tmp5.upgrd.2
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}
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; rdar://9147637
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define i32 @test3(i16 zeroext %a) nounwind {
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entry:
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; CHECK-LABEL: test3:
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; CHECK: revsh r0, r0
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%0 = tail call i16 @llvm.bswap.i16(i16 %a)
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%1 = sext i16 %0 to i32
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ret i32 %1
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}
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declare i16 @llvm.bswap.i16(i16) nounwind readnone
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define i32 @test4(i16 zeroext %a) nounwind {
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entry:
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; CHECK-LABEL: test4:
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; CHECK: revsh r0, r0
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%conv = zext i16 %a to i32
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%shr9 = lshr i16 %a, 8
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%conv2 = zext i16 %shr9 to i32
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%shl = shl nuw nsw i32 %conv, 8
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%or = or i32 %conv2, %shl
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%sext = shl i32 %or, 16
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%conv8 = ashr exact i32 %sext, 16
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ret i32 %conv8
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}
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