forked from OSchip/llvm-project
[InstCombine] add tests for bswap disguised as shuffle; NFC
Somewhat motivating case In PR43146: https://bugs.llvm.org/show_bug.cgi?id=43146 But that's a lot more complicated. llvm-svn: 370381
This commit is contained in:
Sanjay Patel
parent
b8b23a1648
commit
63411910a2
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@ -1,10 +1,11 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; 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: [[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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@ -21,7 +22,7 @@ define i32 @test1(i32 %i) {
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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: [[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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@ -38,7 +39,7 @@ define i32 @test2(i32 %arg) {
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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: [[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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@ -49,7 +50,7 @@ define i16 @test3(i16 %s) {
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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: [[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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@ -60,7 +61,7 @@ define i16 @test4(i16 %s) {
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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: [[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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@ -80,7 +81,7 @@ define i16 @test5(i16 %a) {
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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: [[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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@ -102,7 +103,7 @@ declare void @extra_use(i32)
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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: [[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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@ -122,11 +123,11 @@ define i32 @bswap32_and_first(i32 %x) {
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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: [[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: [[BSWAP:%.*]] = call i32 @llvm.bswap.i32(i32 %x)
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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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@ -148,7 +149,7 @@ define i32 @bswap32_and_first_extra_use(i32 %x) {
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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: [[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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@ -168,11 +169,11 @@ define i32 @bswap32_shl_first(i32 %x) {
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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: [[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: [[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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@ -190,7 +191,7 @@ define i32 @bswap32_shl_first_extra_use(i32 %x) {
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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: [[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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@ -204,7 +205,7 @@ define i16 @test8(i16 %a) {
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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: [[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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@ -217,7 +218,7 @@ define i16 @test9(i16 %a) {
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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: [[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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@ -230,3 +231,65 @@ define i16 @test10(i32 %a) {
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ret i16 %conv
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}
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define i32 @shuf_4bytes(<4 x i8> %x) {
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; CHECK-LABEL: @shuf_4bytes(
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; CHECK-NEXT: [[BSWAP:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[BSWAP]] to i32
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; CHECK-NEXT: ret i32 [[CAST]]
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;
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%bswap = shufflevector <4 x i8> %x, <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
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%cast = bitcast <4 x i8> %bswap to i32
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ret i32 %cast
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}
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define i32 @shuf_load_4bytes(<4 x i8>* %p) {
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; CHECK-LABEL: @shuf_load_4bytes(
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; CHECK-NEXT: [[X:%.*]] = load <4 x i8>, <4 x i8>* [[P:%.*]], align 4
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; CHECK-NEXT: [[BSWAP:%.*]] = shufflevector <4 x i8> [[X]], <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 undef, i32 0>
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[BSWAP]] to i32
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; CHECK-NEXT: ret i32 [[CAST]]
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;
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%x = load <4 x i8>, <4 x i8>* %p
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%bswap = shufflevector <4 x i8> %x, <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 undef, i32 0>
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%cast = bitcast <4 x i8> %bswap to i32
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ret i32 %cast
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}
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define i32 @shuf_bitcast_twice_4bytes(i32 %x) {
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; CHECK-LABEL: @shuf_bitcast_twice_4bytes(
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; CHECK-NEXT: [[CAST1:%.*]] = bitcast i32 [[X:%.*]] to <4 x i8>
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; CHECK-NEXT: [[BSWAP:%.*]] = shufflevector <4 x i8> [[CAST1]], <4 x i8> undef, <4 x i32> <i32 undef, i32 2, i32 1, i32 0>
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; CHECK-NEXT: [[CAST2:%.*]] = bitcast <4 x i8> [[BSWAP]] to i32
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; CHECK-NEXT: ret i32 [[CAST2]]
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;
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%cast1 = bitcast i32 %x to <4 x i8>
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%bswap = shufflevector <4 x i8> %cast1, <4 x i8> undef, <4 x i32> <i32 undef, i32 2, i32 1, i32 0>
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%cast2 = bitcast <4 x i8> %bswap to i32
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ret i32 %cast2
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}
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declare void @use(<4 x i8>)
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define i32 @shuf_4bytes_extra_use(<4 x i8> %x) {
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; CHECK-LABEL: @shuf_4bytes_extra_use(
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; CHECK-NEXT: [[BSWAP:%.*]] = shufflevector <4 x i8> [[X:%.*]], <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
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; CHECK-NEXT: call void @use(<4 x i8> [[BSWAP]])
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <4 x i8> [[BSWAP]] to i32
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; CHECK-NEXT: ret i32 [[CAST]]
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;
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%bswap = shufflevector <4 x i8> %x, <4 x i8> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
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call void @use(<4 x i8> %bswap)
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%cast = bitcast <4 x i8> %bswap to i32
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ret i32 %cast
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}
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define i128 @shuf_load_16bytes(<16 x i8> %x) {
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; CHECK-LABEL: @shuf_load_16bytes(
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; CHECK-NEXT: [[BSWAP:%.*]] = shufflevector <16 x i8> [[X:%.*]], <16 x i8> undef, <16 x i32> <i32 15, i32 14, i32 13, i32 12, i32 11, i32 10, i32 9, i32 8, i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
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; CHECK-NEXT: [[CAST:%.*]] = bitcast <16 x i8> [[BSWAP]] to i128
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; CHECK-NEXT: ret i128 [[CAST]]
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;
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%bswap = shufflevector <16 x i8> %x, <16 x i8> undef, <16 x i32> <i32 15, i32 14, i32 13, i32 12, i32 11, i32 10, i32 9, i32 8, i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
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%cast = bitcast <16 x i8> %bswap to i128
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ret i128 %cast
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}
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