1 ; RUN: llc -mtriple=thumb-eabi -mattr=+v6 %s -o - | FileCheck %s 2 3 define i32 @test1(i32 %X) nounwind { 4 ; CHECK: test1 5 ; CHECK: rev16 r0, r0 6 %tmp1 = lshr i32 %X, 8 7 %X15 = bitcast i32 %X to i32 8 %tmp4 = shl i32 %X15, 8 9 %tmp2 = and i32 %tmp1, 16711680 10 %tmp5 = and i32 %tmp4, -16777216 11 %tmp9 = and i32 %tmp1, 255 12 %tmp13 = and i32 %tmp4, 65280 13 %tmp6 = or i32 %tmp5, %tmp2 14 %tmp10 = or i32 %tmp6, %tmp13 15 %tmp14 = or i32 %tmp10, %tmp9 16 ret i32 %tmp14 17 } 18 19 define i32 @test2(i32 %X) nounwind { 20 ; CHECK: test2 21 ; CHECK: revsh r0, r0 22 %tmp1 = lshr i32 %X, 8 23 %tmp1.upgrd.1 = trunc i32 %tmp1 to i16 24 %tmp3 = trunc i32 %X to i16 25 %tmp2 = and i16 %tmp1.upgrd.1, 255 26 %tmp4 = shl i16 %tmp3, 8 27 %tmp5 = or i16 %tmp2, %tmp4 28 %tmp5.upgrd.2 = sext i16 %tmp5 to i32 29 ret i32 %tmp5.upgrd.2 30 } 31 32 ; rdar://9147637 33 define i32 @test3(i16 zeroext %a) nounwind { 34 entry: 35 ; CHECK-LABEL: test3: 36 ; CHECK: revsh r0, r0 37 %0 = tail call i16 @llvm.bswap.i16(i16 %a) 38 %1 = sext i16 %0 to i32 39 ret i32 %1 40 } 41 42 declare i16 @llvm.bswap.i16(i16) nounwind readnone 43 44 define i32 @test4(i16 zeroext %a) nounwind { 45 entry: 46 ; CHECK-LABEL: test4: 47 ; CHECK: revsh r0, r0 48 %conv = zext i16 %a to i32 49 %shr9 = lshr i16 %a, 8 50 %conv2 = zext i16 %shr9 to i32 51 %shl = shl nuw nsw i32 %conv, 8 52 %or = or i32 %conv2, %shl 53 %sext = shl i32 %or, 16 54 %conv8 = ashr exact i32 %sext, 16 55 ret i32 %conv8 56 } 57
