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[VectorCombine][X86] Add tests showing failure to push a shuffle through a fma with multiple constants #170458

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Merged
RKSimon merged 1 commit into from
Dec 3, 2025
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[VectorCombine][X86] Add tests showing failure to push a shuffle through a fma with multiple constants #170458

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49 changes: 49 additions & 0 deletions llvm/test/Transforms/VectorCombine/X86/shuffle-of-fma-const.ll
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; 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-- -mcpu=x86-64 | FileCheck %s --check-prefixes=CHECK,SSE
; RUN: opt < %s -passes=vector-combine -S -mtriple=x86_64-- -mcpu=x86-64-v3 | FileCheck %s --check-prefixes=CHECK,AVX

define <4 x float> @shuffle_fma_const_chain(<4 x float> %a0) {
; CHECK-LABEL: define <4 x float> @shuffle_fma_const_chain(
; CHECK-SAME: <4 x float> [[A0:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[F:%.*]] = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> [[A0]], <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
; CHECK-NEXT: [[RES:%.*]] = shufflevector <4 x float> [[F]], <4 x float> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT: ret <4 x float> [[RES]]
;
%f = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> %a0, <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
%res = shufflevector <4 x float> %f, <4 x float> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
ret <4 x float> %res
}

define <8 x float> @concat_fma_const_chain(<4 x float> %a0, <4 x float> %a1) {
; SSE-LABEL: define <8 x float> @concat_fma_const_chain(
; SSE-SAME: <4 x float> [[A0:%.*]], <4 x float> [[A1:%.*]]) #[[ATTR0]] {
; SSE-NEXT: [[TMP1:%.*]] = shufflevector <4 x float> [[A0]], <4 x float> [[A1]], <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; SSE-NEXT: [[RES:%.*]] = call <8 x float> @llvm.fma.v8f32(<8 x float> [[TMP1]], <8 x float> splat (float 0x3F8DE8D040000000), <8 x float> splat (float 0xBFB3715EE0000000))
; SSE-NEXT: ret <8 x float> [[RES]]
;
; AVX-LABEL: define <8 x float> @concat_fma_const_chain(
; AVX-SAME: <4 x float> [[A0:%.*]], <4 x float> [[A1:%.*]]) #[[ATTR0]] {
; AVX-NEXT: [[L:%.*]] = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> [[A0]], <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
; AVX-NEXT: [[H:%.*]] = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> [[A1]], <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
; AVX-NEXT: [[RES:%.*]] = shufflevector <4 x float> [[L]], <4 x float> [[H]], <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
; AVX-NEXT: ret <8 x float> [[RES]]
;
%l = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> %a0, <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
%h = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> %a1, <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
%res = shufflevector <4 x float> %l, <4 x float> %h, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
ret <8 x float> %res
}

define <8 x float> @interleave_fma_const_chain(<4 x float> %a0, <4 x float> %a1) {
; CHECK-LABEL: define <8 x float> @interleave_fma_const_chain(
; CHECK-SAME: <4 x float> [[A0:%.*]], <4 x float> [[A1:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[L:%.*]] = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> [[A0]], <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
; CHECK-NEXT: [[H:%.*]] = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> [[A1]], <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
; CHECK-NEXT: [[RES:%.*]] = shufflevector <4 x float> [[L]], <4 x float> [[H]], <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
; CHECK-NEXT: ret <8 x float> [[RES]]
;
%l = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> %a0, <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
%h = tail call noundef <4 x float> @llvm.fma.v4f32(<4 x float> %a1, <4 x float> splat (float 0x3F8DE8D040000000), <4 x float> splat (float 0xBFB3715EE0000000))
%res = shufflevector <4 x float> %l, <4 x float> %h, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
ret <8 x float> %res
}
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