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llvm-6502/test/CodeGen/X86/combine-vec-shuffle-3.ll
Andrea Di Biagio 35f6e97777 [X86] Add a check for 'isMOVHLPSMask' within method 'isShuffleMaskLegal'. 
Before this change, method 'isShuffleMaskLegal' didn't know that shuffles
implementing a 'movhlps' operation were perfectly legal for SSE targets.

This patch adds the missing check for 'isMOVHLPSMask' inside method
'isShuffleMaskLegal' to fix the problem.

The reason why it is important to do this is because the DAGCombiner
conservatively avoids combining a pair of shuffles if the resulting shuffle
node has an illegal mask. Before this patch, shuffles with a MOVHLPS mask were
wrongly considered not to be legal. This was the root cause of some poor-code
generation bugs.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213137 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-16 11:29:39 +00:00

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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 | FileCheck %s
define <4 x float> @test1(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
ret <4 x float> %2
}
; CHECK-LABEL: test1
; Mask: [0,1,2,3]
; CHECK: movaps
; CHECK: ret
define <4 x float> @test2(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 6, i32 3>
ret <4 x float> %2
}
; CHECK-LABEL: test2
; Mask: [0,5,6,7]
; CHECK: movss
; CHECK: ret
define <4 x float> @test3(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 1, i32 7>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 2, i32 4, i32 1>
ret <4 x float> %2
}
; CHECK-LABEL: test3
; Mask: [0,1,4,5]
; CHECK: movlhps
; CHECK: ret
define <4 x float> @test4(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 2, i32 3, i32 5, i32 5>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
ret <4 x float> %2
}
; CHECK-LABEL: test4
; Mask: [6,7,2,3]
; CHECK: movhlps
; CHECK-NEXT: ret
define <4 x float> @test5(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
ret <4 x float> %2
}
; CHECK-LABEL: test5
; Mask: [4,1,6,7]
; CHECK: blendps $13
; CHECK: ret
define <4 x i32> @test6(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
ret <4 x i32> %2
}
; CHECK-LABEL: test6
; Mask: [4,5,6,7]
; CHECK: movaps
; CHECK: ret
define <4 x i32> @test7(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 0, i32 1, i32 6, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test7
; Mask: [0,5,6,7]
; CHECK: movss
; CHECK: ret
define <4 x i32> @test8(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 0, i32 5, i32 1, i32 7>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 0, i32 2, i32 4, i32 1>
ret <4 x i32> %2
}
; CHECK-LABEL: test8
; Mask: [0,1,4,5]
; CHECK: movlhps
; CHECK: ret
define <4 x i32> @test9(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 2, i32 3, i32 5, i32 5>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
ret <4 x i32> %2
}
; CHECK-LABEL: test9
; Mask: [6,7,2,3]
; CHECK: movhlps
; CHECK-NEXT: ret
define <4 x i32> @test10(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
ret <4 x i32> %2
}
; CHECK-LABEL: test10
; Mask: [4,1,6,7]
; CHECK: blendps
; CHECK: ret
define <4 x float> @test11(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %a, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
ret <4 x float> %2
}
; CHECK-LABEL: test11
; Mask: [0,1,2,3]
; CHECK-NOT: movaps
; CHECK-NOT: blendps
; CHECK: ret
define <4 x float> @test12(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 6, i32 7>
%2 = shufflevector <4 x float> %1, <4 x float> %a, <4 x i32> <i32 4, i32 1, i32 2, i32 3>
ret <4 x float> %2
}
; CHECK-LABEL: test12
; Mask: [0,5,6,7]
; CHECK: movss
; CHECK: ret
define <4 x float> @test13(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 4, i32 5>
%2 = shufflevector <4 x float> %1, <4 x float> %a, <4 x i32> <i32 4, i32 5, i32 2, i32 3>
ret <4 x float> %2
}
; CHECK-LABEL: test13
; Mask: [0,1,4,5]
; CHECK: movlhps
; CHECK: ret
define <4 x float> @test14(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 6, i32 7, i32 5, i32 5>
%2 = shufflevector <4 x float> %1, <4 x float> %a, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
ret <4 x float> %2
}
; CHECK-LABEL: test14
; Mask: [6,7,2,3]
; CHECK: movhlps
; CHECK: ret
define <4 x float> @test15(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 7>
%2 = shufflevector <4 x float> %1, <4 x float> %a, <4 x i32> <i32 0, i32 5, i32 2, i32 3>
ret <4 x float> %2
}
; CHECK-LABEL: test15
; Mask: [4,1,6,7]
; CHECK: blendps $13
; CHECK: ret
define <4 x i32> @test16(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x i32> %1, <4 x i32> %a, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test16
; Mask: [0,1,2,3]
; CHECK-NOT: movaps
; CHECK-NOT: blendps
; CHECK: ret
define <4 x i32> @test17(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 0, i32 5, i32 6, i32 7>
%2 = shufflevector <4 x i32> %1, <4 x i32> %a, <4 x i32> <i32 4, i32 1, i32 2, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test17
; Mask: [0,5,6,7]
; CHECK: movss
; CHECK: ret
define <4 x i32> @test18(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 0, i32 1, i32 4, i32 5>
%2 = shufflevector <4 x i32> %1, <4 x i32> %a, <4 x i32> <i32 4, i32 5, i32 2, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test18
; Mask: [0,1,4,5]
; CHECK: movlhps
; CHECK: ret
define <4 x i32> @test19(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 6, i32 7, i32 5, i32 5>
%2 = shufflevector <4 x i32> %1, <4 x i32> %a, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
ret <4 x i32> %2
}
; CHECK-LABEL: test19
; Mask: [6,7,2,3]
; CHECK: movhlps
; CHECK: ret
define <4 x i32> @test20(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 7>
%2 = shufflevector <4 x i32> %1, <4 x i32> %a, <4 x i32> <i32 0, i32 5, i32 2, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test20
; Mask: [4,1,6,7]
; CHECK: blendps $13
; CHECK: ret
; Check some negative cases.
define <4 x float> @test1b(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 0>
ret <4 x float> %2
}
; CHECK-LABEL: test1b
; CHECK: shufps
; CHECK: shufps
; CHECK: ret
define <4 x float> @test2b(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 0, i32 5>
ret <4 x float> %2
}
; CHECK-LABEL: test2b
; CHECK: shufps
; CHECK: pshufd
; CHECK: ret
define <4 x float> @test3b(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 0, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 0, i32 7, i32 2, i32 7>
ret <4 x float> %2
}
; CHECK-LABEL: test3b
; CHECK: shufps
; CHECK: shufps
; CHECK: ret
define <4 x float> @test4b(<4 x float> %a, <4 x float> %b) {
%1 = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x float> %1, <4 x float> %b, <4 x i32> <i32 5, i32 5, i32 2, i32 7>
ret <4 x float> %2
}
; CHECK-LABEL: test4b
; CHECK: shufps
; CHECK: shufps
; CHECK: ret
; Verify that we correctly fold shuffles even when we use illegal vector types.
define <4 x i8> @test1c(<4 x i8>* %a, <4 x i8>* %b) {
%A = load <4 x i8>* %a
%B = load <4 x i8>* %b
%1 = shufflevector <4 x i8> %A, <4 x i8> %B, <4 x i32> <i32 0, i32 5, i32 2, i32 7>
%2 = shufflevector <4 x i8> %1, <4 x i8> %B, <4 x i32> <i32 0, i32 1, i32 6, i32 3>
ret <4 x i8> %2
}
; CHECK-LABEL: test1c
; Mask: [0,5,6,7]
; CHECK: movss
; CHECK-NEXT: ret
define <4 x i8> @test2c(<4 x i8>* %a, <4 x i8>* %b) {
%A = load <4 x i8>* %a
%B = load <4 x i8>* %b
%1 = shufflevector <4 x i8> %A, <4 x i8> %B, <4 x i32> <i32 0, i32 5, i32 1, i32 5>
%2 = shufflevector <4 x i8> %1, <4 x i8> %B, <4 x i32> <i32 0, i32 2, i32 4, i32 1>
ret <4 x i8> %2
}
; CHECK-LABEL: test2c
; Mask: [0,1,4,5]
; CHECK: movlhps
; CHECK-NEXT: ret
define <4 x i8> @test3c(<4 x i8>* %a, <4 x i8>* %b) {
%A = load <4 x i8>* %a
%B = load <4 x i8>* %b
%1 = shufflevector <4 x i8> %A, <4 x i8> %B, <4 x i32> <i32 0, i32 1, i32 5, i32 5>
%2 = shufflevector <4 x i8> %1, <4 x i8> %B, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
ret <4 x i8> %2
}
; FIXME: this should be lowered as a single movhlps. However, the backend
; wrongly thinks that shuffle mask [6,7,2,3] is not legal. Therefore, we end up
; with a sub-optimal sequence of 'shufps+palignr'.
; CHECK-LABEL: test3c
; Mask: [6,7,2,3]
; CHECK: shufps $84
; CHECK: palignr $8
; CHECK: ret
define <4 x i8> @test4c(<4 x i8>* %a, <4 x i8>* %b) {
%A = load <4 x i8>* %a
%B = load <4 x i8>* %b
%1 = shufflevector <4 x i8> %A, <4 x i8> %B, <4 x i32> <i32 4, i32 1, i32 6, i32 3>
%2 = shufflevector <4 x i8> %1, <4 x i8> %B, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
ret <4 x i8> %2
}
; CHECK-LABEL: test4c
; Mask: [4,1,6,7]
; CHECK: blendps $13
; CHECK: ret
; The following test cases are generated from this C++ code
;
;__m128 blend_01(__m128 a, __m128 b)
;{
; __m128 s = a;
; s = _mm_blend_ps( s, b, 1<<0 );
; s = _mm_blend_ps( s, b, 1<<1 );
; return s;
;}
;
;__m128 blend_02(__m128 a, __m128 b)
;{
; __m128 s = a;
; s = _mm_blend_ps( s, b, 1<<0 );
; s = _mm_blend_ps( s, b, 1<<2 );
; return s;
;}
;
;__m128 blend_123(__m128 a, __m128 b)
;{
; __m128 s = a;
; s = _mm_blend_ps( s, b, 1<<1 );
; s = _mm_blend_ps( s, b, 1<<2 );
; s = _mm_blend_ps( s, b, 1<<3 );
; return s;
;}
; Ideally, we should collapse the following shuffles into a single one.
define <4 x float> @blend_01(<4 x float> %a, <4 x float> %b) {
%shuffle = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 undef, i32 2, i32 3>
%shuffle6 = shufflevector <4 x float> %shuffle, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 2, i32 3>
ret <4 x float> %shuffle6
}
; CHECK-LABEL: blend_01
; CHECK: movsd
; CHECK-NEXT: ret
define <4 x float> @blend_02(<4 x float> %a, <4 x float> %b) {
%shuffle = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 4, i32 1, i32 undef, i32 3>
%shuffle6 = shufflevector <4 x float> %shuffle, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 6, i32 3>
ret <4 x float> %shuffle6
}
; CHECK-LABEL: blend_02
; CHECK: blendps $5
; CHECK-NEXT: ret
define <4 x float> @blend_123(<4 x float> %a, <4 x float> %b) {
%shuffle = shufflevector <4 x float> %a, <4 x float> %b, <4 x i32> <i32 0, i32 5, i32 undef, i32 undef>
%shuffle6 = shufflevector <4 x float> %shuffle, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 6, i32 undef>
%shuffle12 = shufflevector <4 x float> %shuffle6, <4 x float> %b, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
ret <4 x float> %shuffle12
}
; CHECK-LABEL: blend_123
; CHECK: movss
; CHECK: ret
define <4 x i32> @test_movhl_1(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 2, i32 7, i32 5, i32 3>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 6, i32 1, i32 0, i32 3>
ret <4 x i32> %2
}
; CHECK-LABEL: test_movhl_1
; CHECK: movhlps
; CHECK-NEXT: ret
define <4 x i32> @test_movhl_2(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 2, i32 0, i32 3, i32 6>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 3, i32 7, i32 0, i32 2>
ret <4 x i32> %2
}
; CHECK-LABEL: test_movhl_2
; CHECK: movhlps
; CHECK-NEXT: ret
define <4 x i32> @test_movhl_3(<4 x i32> %a, <4 x i32> %b) {
%1 = shufflevector <4 x i32> %a, <4 x i32> %b, <4 x i32> <i32 7, i32 6, i32 3, i32 2>
%2 = shufflevector <4 x i32> %1, <4 x i32> %b, <4 x i32> <i32 6, i32 0, i32 3, i32 2>
ret <4 x i32> %2
}
; CHECK-LABEL: test_movhl_3
; CHECK: movhlps
; CHECK-NEXT: ret
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