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clang-p2996/llvm/test/Transforms/LoopVectorize/X86/parallel-loops.ll
Sanjay Patel cc88445a91 [InstCombine] canonicalize 'icmp (trunc X), C' to 'icmp (X & Mask), C' 
I looked at canonicalizing in the other direction, but that causes
many potential regressions and infinite loops because we already
(possibly wrongly) canonicalize "trunc X to i1" into an and+icmp.

This has a data layout restriction to avoid creating illegal
mask instructions, but we could remove that if we can show
that the backend can undo this when needed.

The motivating example from issue #56119 is modeled by the
PhaseOrdering test.
2022-06-30 15:51:39 -04:00

210 lines
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; A tricky loop:
;
; void loop(int *a, int *b) {
; for (int i = 0; i < 512; ++i) {
; a[a[i]] = b[i];
; a[i] = b[i+1];
; }
;}
define void @loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
; CHECK-LABEL: @loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[IDXPROM3:%.*]] = sext i32 [[TMP1]] to i64
; CHECK-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[IDXPROM3]]
; CHECK-NEXT: store i32 [[TMP0]], i32* [[ARRAYIDX4]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[B]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
; CHECK-NEXT: store i32 [[TMP2]], i32* [[ARRAYIDX2]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = and i64 [[INDVARS_IV_NEXT]], 4294967295
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[TMP3]], 512
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
%0 = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
%1 = load i32, i32* %arrayidx2, align 4
%idxprom3 = sext i32 %1 to i64
%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
store i32 %0, i32* %arrayidx4, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
%2 = load i32, i32* %arrayidx6, align 4
store i32 %2, i32* %arrayidx2, align 4
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, 512
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; The same loop with parallel loop metadata added to the loop branch
; and the memory instructions.
define void @parallel_loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
; CHECK-LABEL: @parallel_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = or i64 [[INDEX]], 1
; CHECK-NEXT: [[TMP1:%.*]] = or i64 [[INDEX]], 2
; CHECK-NEXT: [[TMP2:%.*]] = or i64 [[INDEX]], 3
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP4:%.*]] = bitcast i32* [[TMP3]] to <4 x i32>*
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, <4 x i32>* [[TMP4]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP0]]
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP1]]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP2]]
; CHECK-NEXT: [[TMP9:%.*]] = load i32, i32* [[TMP5]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP10:%.*]] = load i32, i32* [[TMP6]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP11:%.*]] = load i32, i32* [[TMP7]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP12:%.*]] = load i32, i32* [[TMP8]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP13:%.*]] = sext i32 [[TMP9]] to i64
; CHECK-NEXT: [[TMP14:%.*]] = sext i32 [[TMP10]] to i64
; CHECK-NEXT: [[TMP15:%.*]] = sext i32 [[TMP11]] to i64
; CHECK-NEXT: [[TMP16:%.*]] = sext i32 [[TMP12]] to i64
; CHECK-NEXT: [[TMP17:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP13]]
; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP14]]
; CHECK-NEXT: [[TMP19:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP15]]
; CHECK-NEXT: [[TMP20:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP16]]
; CHECK-NEXT: [[TMP21:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i64 0
; CHECK-NEXT: store i32 [[TMP21]], i32* [[TMP17]], align 4, !llvm.access.group !1
; CHECK-NEXT: [[TMP22:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i64 1
; CHECK-NEXT: store i32 [[TMP22]], i32* [[TMP18]], align 4, !llvm.access.group !1
; CHECK-NEXT: [[TMP23:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i64 2
; CHECK-NEXT: store i32 [[TMP23]], i32* [[TMP19]], align 4, !llvm.access.group !1
; CHECK-NEXT: [[TMP24:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i64 3
; CHECK-NEXT: store i32 [[TMP24]], i32* [[TMP20]], align 4, !llvm.access.group !1
; CHECK-NEXT: [[TMP25:%.*]] = or i64 [[INDEX]], 1
; CHECK-NEXT: [[TMP26:%.*]] = getelementptr inbounds i32, i32* [[B]], i64 [[TMP25]]
; CHECK-NEXT: [[TMP27:%.*]] = bitcast i32* [[TMP26]] to <4 x i32>*
; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <4 x i32>, <4 x i32>* [[TMP27]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[TMP28:%.*]] = bitcast i32* [[TMP5]] to <4 x i32>*
; CHECK-NEXT: store <4 x i32> [[WIDE_LOAD1]], <4 x i32>* [[TMP28]], align 4, !llvm.access.group !0
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP29:%.*]] = icmp eq i64 [[INDEX_NEXT]], 512
; CHECK-NEXT: br i1 [[TMP29]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP2:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: br i1 undef, label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
%0 = load i32, i32* %arrayidx, align 4, !llvm.access.group !13
%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
%1 = load i32, i32* %arrayidx2, align 4, !llvm.access.group !13
%idxprom3 = sext i32 %1 to i64
%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
; This store might have originated from inlining a function with a parallel
; loop. Refers to a list with the "original loop reference" (!4) also included.
store i32 %0, i32* %arrayidx4, align 4, !llvm.access.group !15
%indvars.iv.next = add i64 %indvars.iv, 1
%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
%2 = load i32, i32* %arrayidx6, align 4, !llvm.access.group !13
store i32 %2, i32* %arrayidx2, align 4, !llvm.access.group !13
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, 512
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3
for.end: ; preds = %for.body
ret void
}
; The same loop with an illegal parallel loop metadata: the memory
; accesses refer to a different loop's identifier.
define void @mixed_metadata(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
; CHECK-LABEL: @mixed_metadata(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[ARRAYIDX]], align 4, !llvm.access.group !7
; CHECK-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4, !llvm.access.group !7
; CHECK-NEXT: [[IDXPROM3:%.*]] = sext i32 [[TMP1]] to i64
; CHECK-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[IDXPROM3]]
; CHECK-NEXT: store i32 [[TMP0]], i32* [[ARRAYIDX4]], align 4, !llvm.access.group !8
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[B]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4, !llvm.access.group !7
; CHECK-NEXT: store i32 [[TMP2]], i32* [[ARRAYIDX2]], align 4, !llvm.access.group !7
; CHECK-NEXT: [[TMP3:%.*]] = and i64 [[INDVARS_IV_NEXT]], 4294967295
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[TMP3]], 512
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END:%.*]], label [[FOR_BODY]], !llvm.loop [[LOOP9:![0-9]+]]
; CHECK: for.end:
; CHECK-NEXT: ret void
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
%0 = load i32, i32* %arrayidx, align 4, !llvm.access.group !16
%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
%1 = load i32, i32* %arrayidx2, align 4, !llvm.access.group !16
%idxprom3 = sext i32 %1 to i64
%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
; This refers to the loop marked with !7 which we are not in at the moment.
; It should prevent detecting as a parallel loop.
store i32 %0, i32* %arrayidx4, align 4, !llvm.access.group !17
%indvars.iv.next = add i64 %indvars.iv, 1
%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
%2 = load i32, i32* %arrayidx6, align 4, !llvm.access.group !16
store i32 %2, i32* %arrayidx2, align 4, !llvm.access.group !16
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, 512
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !6
for.end: ; preds = %for.body
ret void
}
!3 = !{!3, !{!"llvm.loop.parallel_accesses", !13, !15}}
!4 = !{!4, !{!"llvm.loop.parallel_accesses", !14, !15}}
!6 = !{!6, !{!"llvm.loop.parallel_accesses", !16}}
!7 = !{!7, !{!"llvm.loop.parallel_accesses", !17}}
!13 = distinct !{}
!14 = distinct !{}
!15 = distinct !{}
!16 = distinct !{}
!17 = distinct !{}
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