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[NFC][SLP] Add test case for issue #69670. #70088

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Oct 24, 2023
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[NFC][SLP] Add test case for issue #69670. #70088

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59 changes: 59 additions & 0 deletions llvm/test/Transforms/SLPVectorizer/X86/delayed-gather-emission.ll
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Original file line number Diff line number Diff line change
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -passes=slp-vectorizer -mtriple=x86_64 -mattr=+avx2 -S < %s | FileCheck %s

; Test case for issue #69670.

; #69392 uncovered a problem with delayed gather nodes emission, specifically
; when the node is a PHI operand, which depends on another gathered node,
; also an operand of a PHI (in another block).

define void @test() {
; CHECK-LABEL: define void @test(
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[DOTPRE_PRE:%.*]] = load float, ptr poison, align 4
; CHECK-NEXT: [[TMP0:%.*]] = insertelement <2 x float> <float poison, float undef>, float [[DOTPRE_PRE]], i32 0
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP1:%.*]] = phi <2 x float> [ [[TMP0]], [[ENTRY:%.*]] ], [ [[TMP10:%.*]], [[BB2:%.*]] ]
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: [[TMP2:%.*]] = phi <2 x float> [ [[TMP1]], [[BB1]] ], [ [[TMP9:%.*]], [[BB2]] ]
; CHECK-NEXT: [[I1:%.*]] = load float, ptr poison, align 4
; CHECK-NEXT: [[TMP3:%.*]] = shufflevector <2 x float> [[TMP2]], <2 x float> poison, <2 x i32> <i32 1, i32 poison>
; CHECK-NEXT: [[TMP4:%.*]] = insertelement <2 x float> [[TMP3]], float [[I1]], i32 1
; CHECK-NEXT: [[TMP5:%.*]] = fdiv <2 x float> [[TMP2]], [[TMP4]]
; CHECK-NEXT: [[TMP6:%.*]] = extractelement <2 x float> [[TMP5]], i32 0
; CHECK-NEXT: [[TMP7:%.*]] = extractelement <2 x float> [[TMP5]], i32 1
; CHECK-NEXT: [[MUL:%.*]] = fmul float [[TMP6]], [[TMP7]]
; CHECK-NEXT: tail call void @foo(float [[MUL]])
; CHECK-NEXT: [[I2:%.*]] = load float, ptr poison, align 4
; CHECK-NEXT: [[TOBOOL:%.*]] = fcmp une float [[I2]], 0.000000e+00
; CHECK-NEXT: [[TMP8:%.*]] = insertelement <2 x float> poison, float [[I2]], i32 0
; CHECK-NEXT: [[TMP9]] = shufflevector <2 x float> [[TMP8]], <2 x float> [[TMP5]], <2 x i32> <i32 0, i32 2>
; CHECK-NEXT: [[TMP10]] = shufflevector <2 x float> [[TMP8]], <2 x float> [[TMP2]], <2 x i32> <i32 0, i32 3>
; CHECK-NEXT: br i1 [[TOBOOL]], label [[BB1]], label [[BB2]]
;
entry:
%.pre.pre = load float, ptr poison, align 4
br label %bb1

bb1: ; preds = %bb2, %entry
%.pre = phi float [ %.pre.pre, %entry ], [ %i2, %bb2 ]
%foxtrot.0 = phi float [ undef, %entry ], [ %gulf.0, %bb2 ]
br label %bb2

bb2: ; preds = %bb2, %bb1
%i = phi float [ %.pre, %bb1 ], [ %i2, %bb2 ]
%gulf.0 = phi float [ %foxtrot.0, %bb1 ], [ %div, %bb2 ]
%div = fdiv float %i, %gulf.0
%i1 = load float, ptr poison, align 4
%div1 = fdiv float %gulf.0, %i1
%mul = fmul float %div, %div1
tail call void @foo(float %mul)
%i2 = load float, ptr poison, align 4
%tobool = fcmp une float %i2, 0.000000e+00
br i1 %tobool, label %bb1, label %bb2
}

declare void @foo(float)