llvm/test/Transforms/VectorCombine/X86/shuffle-of-shuffles.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -passes=vector-combine -S -mtriple=x86_64-- -mattr=sse2 | FileCheck %s
; RUN: opt < %s -passes=vector-combine -S -mtriple=x86_64-- -mattr=avx2 | FileCheck %s

; fold to identity

define <8 x i32> @concat_extract_subvectors(<8 x i32> %x) {
; CHECK-LABEL: define <8 x i32> @concat_extract_subvectors(
; CHECK-SAME: <8 x i32> [[X:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:    ret <8 x i32> [[X]]
;
  %lo = shufflevector <8 x i32> %x, <8 x i32> poison, <4 x i32> <i32 0, i32 1, i32 2, i32 3>
  %hi = shufflevector <8 x i32> %x, <8 x i32> poison, <4 x i32> <i32 4, i32 5, i32 6, i32 7>
  %concat = shufflevector <4 x i32> %lo, <4 x i32> %hi, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
  ret <8 x i32> %concat
}

; negative test - shuffle contains undef

define <8 x i32> @concat_extract_subvectors_undef(<8 x i32> %x) {
; CHECK-LABEL: define <8 x i32> @concat_extract_subvectors_undef(
; CHECK-SAME: <8 x i32> [[X:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:    [[LO:%.*]] = shufflevector <8 x i32> [[X]], <8 x i32> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 8>
; CHECK-NEXT:    [[HI:%.*]] = shufflevector <8 x i32> [[X]], <8 x i32> undef, <4 x i32> <i32 4, i32 5, i32 6, i32 8>
; CHECK-NEXT:    [[CONCAT:%.*]] = shufflevector <4 x i32> [[LO]], <4 x i32> [[HI]], <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; CHECK-NEXT:    ret <8 x i32> [[CONCAT]]
;
  %lo = shufflevector <8 x i32> %x, <8 x i32> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 8>
  %hi = shufflevector <8 x i32> %x, <8 x i32> undef, <4 x i32> <i32 4, i32 5, i32 6, i32 8>
  %concat = shufflevector <4 x i32> %lo, <4 x i32> %hi, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
  ret <8 x i32> %concat
}

; shuffle contains poison

define <8 x i32> @concat_extract_subvectors_poison(<8 x i32> %x) {
; CHECK-LABEL: define <8 x i32> @concat_extract_subvectors_poison(
; CHECK-SAME: <8 x i32> [[X:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:    ret <8 x i32> [[X]]
;
  %lo = shufflevector <8 x i32> %x, <8 x i32> poison, <4 x i32> <i32 0, i32 1, i32 2, i32 8>
  %hi = shufflevector <8 x i32> %x, <8 x i32> poison, <4 x i32> <i32 4, i32 5, i32 6, i32 8>
  %concat = shufflevector <4 x i32> %lo, <4 x i32> %hi, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
  ret <8 x i32> %concat
}

; broadcast loads are free on AVX (and blends are much cheap than general 2-operand shuffles)

define  <4 x double> @blend_broadcasts_v4f64(ptr %p0, ptr %p1)  {
; CHECK-LABEL: define <4 x double> @blend_broadcasts_v4f64(
; CHECK-SAME: ptr [[P0:%.*]], ptr [[P1:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:    [[LD0:%.*]] = load <4 x double>, ptr [[P0]], align 32
; CHECK-NEXT:    [[LD1:%.*]] = load <4 x double>, ptr [[P1]], align 32
; CHECK-NEXT:    [[BCST0:%.*]] = shufflevector <4 x double> [[LD0]], <4 x double> undef, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[BCST1:%.*]] = shufflevector <4 x double> [[LD1]], <4 x double> undef, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[BLEND:%.*]] = shufflevector <4 x double> [[BCST0]], <4 x double> [[BCST1]], <4 x i32> <i32 0, i32 5, i32 6, i32 3>
; CHECK-NEXT:    ret <4 x double> [[BLEND]]
;
  %ld0 = load <4 x double>, ptr %p0, align 32
  %ld1 = load <4 x double>, ptr %p1, align 32
  %bcst0 = shufflevector <4 x double> %ld0, <4 x double> undef, <4 x i32> zeroinitializer
  %bcst1 = shufflevector <4 x double> %ld1, <4 x double> undef, <4 x i32> zeroinitializer
  %blend = shufflevector <4 x double> %bcst0, <4 x double> %bcst1, <4 x i32> <i32 0, i32 5, i32 6, i32 3>
  ret <4 x double> %blend
}