forked from OSchip/llvm-project
236 lines
6.6 KiB
LLVM
236 lines
6.6 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
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define i32 @test1(i32 %i) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[TMP12:%.*]] = call i32 @llvm.bswap.i32(i32 %i)
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; CHECK-NEXT: ret i32 [[TMP12]]
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;
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%tmp1 = lshr i32 %i, 24
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%tmp3 = lshr i32 %i, 8
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%tmp4 = and i32 %tmp3, 65280
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%tmp5 = or i32 %tmp1, %tmp4
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%tmp7 = shl i32 %i, 8
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%tmp8 = and i32 %tmp7, 16711680
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%tmp9 = or i32 %tmp5, %tmp8
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%tmp11 = shl i32 %i, 24
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%tmp12 = or i32 %tmp9, %tmp11
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ret i32 %tmp12
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}
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define i32 @test2(i32 %arg) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[TMP14:%.*]] = call i32 @llvm.bswap.i32(i32 %arg)
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; CHECK-NEXT: ret i32 [[TMP14]]
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;
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%tmp2 = shl i32 %arg, 24
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%tmp4 = shl i32 %arg, 8
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%tmp5 = and i32 %tmp4, 16711680
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%tmp6 = or i32 %tmp2, %tmp5
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%tmp8 = lshr i32 %arg, 8
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%tmp9 = and i32 %tmp8, 65280
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%tmp10 = or i32 %tmp6, %tmp9
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%tmp12 = lshr i32 %arg, 24
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%tmp14 = or i32 %tmp10, %tmp12
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ret i32 %tmp14
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}
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define i16 @test3(i16 %s) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[TMP5:%.*]] = call i16 @llvm.bswap.i16(i16 %s)
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; CHECK-NEXT: ret i16 [[TMP5]]
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;
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%tmp2 = lshr i16 %s, 8
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%tmp4 = shl i16 %s, 8
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%tmp5 = or i16 %tmp2, %tmp4
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ret i16 %tmp5
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}
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define i16 @test4(i16 %s) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[TMP5:%.*]] = call i16 @llvm.bswap.i16(i16 %s)
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; CHECK-NEXT: ret i16 [[TMP5]]
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;
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%tmp2 = lshr i16 %s, 8
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%tmp4 = shl i16 %s, 8
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%tmp5 = or i16 %tmp4, %tmp2
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ret i16 %tmp5
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}
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define i16 @test5(i16 %a) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[TMP_UPGRD_3:%.*]] = call i16 @llvm.bswap.i16(i16 %a)
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; CHECK-NEXT: ret i16 [[TMP_UPGRD_3]]
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;
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%tmp = zext i16 %a to i32
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%tmp1 = and i32 %tmp, 65280
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%tmp2 = ashr i32 %tmp1, 8
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%tmp2.upgrd.1 = trunc i32 %tmp2 to i16
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%tmp4 = and i32 %tmp, 255
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%tmp5 = shl i32 %tmp4, 8
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%tmp5.upgrd.2 = trunc i32 %tmp5 to i16
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%tmp.upgrd.3 = or i16 %tmp2.upgrd.1, %tmp5.upgrd.2
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%tmp6 = bitcast i16 %tmp.upgrd.3 to i16
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%tmp6.upgrd.4 = zext i16 %tmp6 to i32
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%retval = trunc i32 %tmp6.upgrd.4 to i16
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ret i16 %retval
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}
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; PR2842
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define i32 @test6(i32 %x) nounwind readnone {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[TMP7:%.*]] = call i32 @llvm.bswap.i32(i32 %x)
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; CHECK-NEXT: ret i32 [[TMP7]]
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;
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%tmp = shl i32 %x, 16
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%x.mask = and i32 %x, 65280
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%tmp1 = lshr i32 %x, 16
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%tmp2 = and i32 %tmp1, 255
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%tmp3 = or i32 %x.mask, %tmp
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%tmp4 = or i32 %tmp3, %tmp2
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%tmp5 = shl i32 %tmp4, 8
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%tmp6 = lshr i32 %x, 24
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%tmp7 = or i32 %tmp5, %tmp6
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ret i32 %tmp7
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}
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declare void @extra_use(i32)
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; swaphalf = (x << 16 | x >> 16)
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; ((swaphalf & 0x00ff00ff) << 8) | ((swaphalf >> 8) & 0x00ff00ff)
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define i32 @bswap32_and_first(i32 %x) {
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; CHECK-LABEL: @bswap32_and_first(
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; CHECK-NEXT: [[BSWAP:%.*]] = call i32 @llvm.bswap.i32(i32 %x)
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; CHECK-NEXT: ret i32 [[BSWAP]]
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;
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%shl = shl i32 %x, 16
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%shr = lshr i32 %x, 16
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%swaphalf = or i32 %shl, %shr
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%t = and i32 %swaphalf, 16711935
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%tshl = shl nuw i32 %t, 8
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%b = lshr i32 %swaphalf, 8
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%band = and i32 %b, 16711935
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%bswap = or i32 %tshl, %band
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ret i32 %bswap
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}
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; FIXME: Extra use should not prevent matching to bswap.
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; swaphalf = (x << 16 | x >> 16)
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; ((swaphalf & 0x00ff00ff) << 8) | ((swaphalf >> 8) & 0x00ff00ff)
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define i32 @bswap32_and_first_extra_use(i32 %x) {
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; CHECK-LABEL: @bswap32_and_first_extra_use(
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; CHECK-NEXT: [[SHL:%.*]] = shl i32 %x, 16
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; CHECK-NEXT: [[SHR:%.*]] = lshr i32 %x, 16
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; CHECK-NEXT: [[SWAPHALF:%.*]] = or i32 [[SHL]], [[SHR]]
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; CHECK-NEXT: [[T:%.*]] = and i32 [[SWAPHALF]], 16711935
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; CHECK-NEXT: [[TSHL:%.*]] = shl nuw i32 [[T]], 8
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; CHECK-NEXT: [[B:%.*]] = lshr i32 [[SWAPHALF]], 8
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; CHECK-NEXT: [[BAND:%.*]] = and i32 [[B]], 16711935
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; CHECK-NEXT: [[BSWAP:%.*]] = or i32 [[TSHL]], [[BAND]]
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; CHECK-NEXT: call void @extra_use(i32 [[T]])
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; CHECK-NEXT: ret i32 [[BSWAP]]
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;
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%shl = shl i32 %x, 16
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%shr = lshr i32 %x, 16
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%swaphalf = or i32 %shl, %shr
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%t = and i32 %swaphalf, 16711935
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%tshl = shl nuw i32 %t, 8
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%b = lshr i32 %swaphalf, 8
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%band = and i32 %b, 16711935
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%bswap = or i32 %tshl, %band
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call void @extra_use(i32 %t)
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ret i32 %bswap
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}
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; swaphalf = (x << 16 | x >> 16)
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; ((swaphalf << 8) & 0xff00ff00) | ((swaphalf >> 8) & 0x00ff00ff)
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; PR23863
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define i32 @bswap32_shl_first(i32 %x) {
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; CHECK-LABEL: @bswap32_shl_first(
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; CHECK-NEXT: [[BSWAP:%.*]] = call i32 @llvm.bswap.i32(i32 %x)
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; CHECK-NEXT: ret i32 [[BSWAP]]
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;
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%shl = shl i32 %x, 16
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%shr = lshr i32 %x, 16
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%swaphalf = or i32 %shl, %shr
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%t = shl i32 %swaphalf, 8
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%tand = and i32 %t, -16711936
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%b = lshr i32 %swaphalf, 8
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%band = and i32 %b, 16711935
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%bswap = or i32 %tand, %band
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ret i32 %bswap
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}
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; Extra use should not prevent matching to bswap.
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; swaphalf = (x << 16 | x >> 16)
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; ((swaphalf << 8) & 0xff00ff00) | ((swaphalf >> 8) & 0x00ff00ff)
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define i32 @bswap32_shl_first_extra_use(i32 %x) {
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; CHECK-LABEL: @bswap32_shl_first_extra_use(
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; CHECK-NEXT: [[SHL:%.*]] = shl i32 %x, 16
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; CHECK-NEXT: [[SHR:%.*]] = lshr i32 %x, 16
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; CHECK-NEXT: [[SWAPHALF:%.*]] = or i32 [[SHL]], [[SHR]]
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; CHECK-NEXT: [[T:%.*]] = shl i32 [[SWAPHALF]], 8
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; CHECK-NEXT: [[BSWAP:%.*]] = call i32 @llvm.bswap.i32(i32 %x)
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; CHECK-NEXT: call void @extra_use(i32 [[T]])
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; CHECK-NEXT: ret i32 [[BSWAP]]
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;
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%shl = shl i32 %x, 16
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%shr = lshr i32 %x, 16
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%swaphalf = or i32 %shl, %shr
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%t = shl i32 %swaphalf, 8
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%tand = and i32 %t, -16711936
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%b = lshr i32 %swaphalf, 8
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%band = and i32 %b, 16711935
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%bswap = or i32 %tand, %band
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call void @extra_use(i32 %t)
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ret i32 %bswap
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}
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define i16 @test8(i16 %a) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: [[REV:%.*]] = call i16 @llvm.bswap.i16(i16 %a)
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; CHECK-NEXT: ret i16 [[REV]]
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;
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%conv = zext i16 %a to i32
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%shr = lshr i16 %a, 8
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%shl = shl i32 %conv, 8
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%conv1 = zext i16 %shr to i32
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%or = or i32 %conv1, %shl
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%conv2 = trunc i32 %or to i16
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ret i16 %conv2
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}
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define i16 @test9(i16 %a) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: [[REV:%.*]] = call i16 @llvm.bswap.i16(i16 %a)
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; CHECK-NEXT: ret i16 [[REV]]
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;
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%conv = zext i16 %a to i32
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%shr = lshr i32 %conv, 8
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%shl = shl i32 %conv, 8
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%or = or i32 %shr, %shl
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%conv2 = trunc i32 %or to i16
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ret i16 %conv2
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}
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define i16 @test10(i32 %a) {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[TRUNC:%.*]] = trunc i32 %a to i16
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; CHECK-NEXT: [[REV:%.*]] = call i16 @llvm.bswap.i16(i16 [[TRUNC]])
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; CHECK-NEXT: ret i16 [[REV]]
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;
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%shr1 = lshr i32 %a, 8
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%and1 = and i32 %shr1, 255
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%and2 = shl i32 %a, 8
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%shl1 = and i32 %and2, 65280
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%or = or i32 %and1, %shl1
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%conv = trunc i32 %or to i16
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ret i16 %conv
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}
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