1 ; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -mcpu=core-avx2 | FileCheck %s
3 ; Test that we correctly fold a shuffle that performs a swizzle of another
4 ; shuffle node according to the rule
5 ; shuffle (shuffle (x, undef, M0), undef, M1) -> shuffle(x, undef, M2)
7 ; We only do this if the resulting mask is legal to avoid introducing an
8 ; illegal shuffle that is expanded into a sub-optimal sequence of instructions
9 ; during lowering stage.
11 ; Check that we produce a single vector permute / shuffle in all cases.
13 define <8 x i32> @swizzle_1(<8 x i32> %v) {
14 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 3, i32 1, i32 2, i32 0, i32 7, i32 5, i32 6, i32 4>
15 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 1, i32 0, i32 2, i32 3, i32 7, i32 5, i32 6, i32 4>
18 ; CHECK-LABEL: swizzle_1
24 define <8 x i32> @swizzle_2(<8 x i32> %v) {
25 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 6, i32 7, i32 4, i32 5, i32 0, i32 1, i32 2, i32 3>
26 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 6, i32 7, i32 4, i32 5, i32 0, i32 1, i32 2, i32 3>
29 ; CHECK-LABEL: swizzle_2
36 define <8 x i32> @swizzle_3(<8 x i32> %v) {
37 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 2, i32 3, i32 0, i32 1>
38 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 2, i32 3, i32 0, i32 1>
41 ; CHECK-LABEL: swizzle_3
48 define <8 x i32> @swizzle_4(<8 x i32> %v) {
49 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 4, i32 7, i32 5, i32 6, i32 3, i32 2, i32 0, i32 1>
50 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 4, i32 7, i32 5, i32 6, i32 3, i32 2, i32 0, i32 1>
53 ; CHECK-LABEL: swizzle_4
59 define <8 x i32> @swizzle_5(<8 x i32> %v) {
60 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 7, i32 4, i32 6, i32 5, i32 0, i32 2, i32 1, i32 3>
61 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 7, i32 4, i32 6, i32 5, i32 0, i32 2, i32 1, i32 3>
64 ; CHECK-LABEL: swizzle_5
70 define <8 x i32> @swizzle_6(<8 x i32> %v) {
71 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 2, i32 1, i32 3, i32 0, i32 4, i32 7, i32 6, i32 5>
72 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 2, i32 1, i32 3, i32 0, i32 4, i32 7, i32 6, i32 5>
75 ; CHECK-LABEL: swizzle_6
81 define <8 x i32> @swizzle_7(<8 x i32> %v) {
82 %1 = shufflevector <8 x i32> %v, <8 x i32> undef, <8 x i32> <i32 0, i32 3, i32 1, i32 2, i32 5, i32 4, i32 6, i32 7>
83 %2 = shufflevector <8 x i32> %1, <8 x i32> undef, <8 x i32> <i32 0, i32 3, i32 1, i32 2, i32 5, i32 4, i32 6, i32 7>
86 ; CHECK-LABEL: swizzle_7