Doomhowl-Interactive/llvm-project
0
0
Fork 0
Code Issues Pull Requests Actions 5 Packages Projects Releases Wiki Activity
Files
81f445b7df94de485240b21034682f22432729c4
llvm-project/llvm/test/Transforms/LoopVectorize/forked-pointers.ll
Florian Hahn 2dcf858ba0 [LAA] Use SCEVPtrToAddr in tryToCreateDiffChecks. (#178861) 
The checks created by LAA only compute a pointer difference and do not
need to capture provenance. Use SCEVPtrToAddr instead of SCEVPtrToInt
for computations.

To avoid regressions while parts of SCEV are migrated to use PtrToAddr
this adds logic to rewrite all PtrToInt to PtrToAddr if possible in the
created expressions. This is needed to avoid regressions.

Similarly, if in the original IR we have a PtrToInt, SCEVExpander tries
to re-use it if possible when expanding PtrToAddr.

Depends on https://github.com/llvm/llvm-project/pull/178727.

Fixes https://github.com/llvm/llvm-project/issues/156978.

PR: https://github.com/llvm/llvm-project/pull/178861
2026-02-11 11:51:51 +00:00

175 lines
9.6 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize,instcombine -force-vector-width=4 -S < %s 2>&1 | FileCheck %s
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
;;;; Derived from the following C code
;; void forked_ptrs_different_base_same_offset(ptr A, ptr B, ptr C, int *D) {
;; for (int i=0; i<100; i++) {
;; if (D[i] != 0) {
;; C[i] = A[i];
;; } else {
;; C[i] = B[i];
;; }
;; }
;; }
define dso_local void @forked_ptrs_different_base_same_offset(ptr nocapture readonly %Base1, ptr nocapture readonly %Base2, ptr nocapture %Dest, ptr nocapture readonly %Preds) {
; CHECK-LABEL: @forked_ptrs_different_base_same_offset(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[BASE1:%.*]] = freeze ptr [[BASE3:%.*]]
; CHECK-NEXT: [[BASE2:%.*]] = freeze ptr [[BASE4:%.*]]
; CHECK-NEXT: [[DEST:%.*]] = freeze ptr [[DEST2:%.*]]
; CHECK-NEXT: br label [[VECTOR_MEMCHECK:%.*]]
; CHECK: vector.memcheck:
; CHECK-NEXT: [[DEST1:%.*]] = ptrtoaddr ptr [[DEST]] to i64
; CHECK-NEXT: [[PREDS2:%.*]] = ptrtoaddr ptr [[PREDS:%.*]] to i64
; CHECK-NEXT: [[BASE23:%.*]] = ptrtoaddr ptr [[BASE2]] to i64
; CHECK-NEXT: [[BASE15:%.*]] = ptrtoaddr ptr [[BASE1]] to i64
; CHECK-NEXT: [[TMP0:%.*]] = sub i64 [[DEST1]], [[PREDS2]]
; CHECK-NEXT: [[DIFF_CHECK:%.*]] = icmp ult i64 [[TMP0]], 16
; CHECK-NEXT: [[TMP1:%.*]] = sub i64 [[DEST1]], [[BASE23]]
; CHECK-NEXT: [[DIFF_CHECK4:%.*]] = icmp ult i64 [[TMP1]], 16
; CHECK-NEXT: [[CONFLICT_RDX:%.*]] = or i1 [[DIFF_CHECK]], [[DIFF_CHECK4]]
; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[DEST1]], [[BASE15]]
; CHECK-NEXT: [[DIFF_CHECK6:%.*]] = icmp ult i64 [[TMP2]], 16
; CHECK-NEXT: [[CONFLICT_RDX7:%.*]] = or i1 [[CONFLICT_RDX]], [[DIFF_CHECK6]]
; CHECK-NEXT: br i1 [[CONFLICT_RDX7]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x ptr> poison, ptr [[BASE2]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x ptr> [[BROADCAST_SPLATINSERT]], <4 x ptr> poison, <4 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT8:%.*]] = insertelement <4 x ptr> poison, ptr [[BASE1]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT9:%.*]] = shufflevector <4 x ptr> [[BROADCAST_SPLATINSERT8]], <4 x ptr> poison, <4 x i32> zeroinitializer
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[PREDS]], i64 [[INDEX]]
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP6]], align 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp eq <4 x i32> [[WIDE_LOAD]], zeroinitializer
; CHECK-NEXT: [[TMP8:%.*]] = select <4 x i1> [[TMP7]], <4 x ptr> [[BROADCAST_SPLAT]], <4 x ptr> [[BROADCAST_SPLAT9]]
; CHECK-NEXT: [[TMP9:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 0
; CHECK-NEXT: [[TMP11:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 1
; CHECK-NEXT: [[TMP13:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 2
; CHECK-NEXT: [[TMP15:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 3
; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds float, ptr [[TMP9]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP29:%.*]] = getelementptr float, ptr [[TMP11]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr i8, ptr [[TMP29]], i64 4
; CHECK-NEXT: [[TMP30:%.*]] = getelementptr float, ptr [[TMP13]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[TMP30]], i64 8
; CHECK-NEXT: [[TMP31:%.*]] = getelementptr float, ptr [[TMP15]], i64 [[INDEX]]
; CHECK-NEXT: [[TMP16:%.*]] = getelementptr i8, ptr [[TMP31]], i64 12
; CHECK-NEXT: [[TMP17:%.*]] = load float, ptr [[TMP10]], align 4
; CHECK-NEXT: [[TMP18:%.*]] = load float, ptr [[TMP12]], align 4
; CHECK-NEXT: [[TMP19:%.*]] = load float, ptr [[TMP14]], align 4
; CHECK-NEXT: [[TMP20:%.*]] = load float, ptr [[TMP16]], align 4
; CHECK-NEXT: [[TMP21:%.*]] = insertelement <4 x float> poison, float [[TMP17]], i64 0
; CHECK-NEXT: [[TMP22:%.*]] = insertelement <4 x float> [[TMP21]], float [[TMP18]], i64 1
; CHECK-NEXT: [[TMP23:%.*]] = insertelement <4 x float> [[TMP22]], float [[TMP19]], i64 2
; CHECK-NEXT: [[TMP24:%.*]] = insertelement <4 x float> [[TMP23]], float [[TMP20]], i64 3
; CHECK-NEXT: [[TMP25:%.*]] = getelementptr inbounds float, ptr [[DEST]], i64 [[INDEX]]
; CHECK-NEXT: store <4 x float> [[TMP24]], ptr [[TMP25]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP26:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT: br i1 [[TMP26]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: br label [[FOR_COND_CLEANUP:%.*]]
; CHECK: scalar.ph:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw i32, ptr [[PREDS]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP27:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; CHECK-NEXT: [[CMP1_NOT:%.*]] = icmp eq i32 [[TMP27]], 0
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[CMP1_NOT]], ptr [[BASE2]], ptr [[BASE1]]
; CHECK-NEXT: [[DOTSINK_IN:%.*]] = getelementptr inbounds nuw float, ptr [[SPEC_SELECT]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[DOTSINK:%.*]] = load float, ptr [[DOTSINK_IN]], align 4
; CHECK-NEXT: [[TMP28:%.*]] = getelementptr inbounds nuw float, ptr [[DEST]], i64 [[INDVARS_IV]]
; CHECK-NEXT: store float [[DOTSINK]], ptr [[TMP28]], align 4
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 100
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
;
entry:
br label %for.body
for.cond.cleanup:
ret void
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %Preds, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%cmp1.not = icmp eq i32 %0, 0
%spec.select = select i1 %cmp1.not, ptr %Base2, ptr %Base1
%.sink.in = getelementptr inbounds float, ptr %spec.select, i64 %indvars.iv
%.sink = load float, ptr %.sink.in, align 4
%1 = getelementptr inbounds float, ptr %Dest, i64 %indvars.iv
store float %.sink, ptr %1, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond.not = icmp eq i64 %indvars.iv.next, 100
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}
;;;; Derived from the following C code
;; void forked_ptrs_same_base_different_offset(ptr A, ptr B, int *C) {
;; int offset;
;; for (int i = 0; i < 100; i++) {
;; if (C[i] != 0)
;; offset = i;
;; else
;; offset = i+1;
;; B[i] = A[offset];
;; }
;; }
define dso_local void @forked_ptrs_same_base_different_offset(ptr nocapture readonly %Base, ptr nocapture %Dest, ptr nocapture readonly %Preds) {
; CHECK-LABEL: @forked_ptrs_same_base_different_offset(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[I_014:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[ADD:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw i32, ptr [[PREDS:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; CHECK-NEXT: [[CMP1_NOT:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[I_014]], 1
; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT: [[OFFSET_0:%.*]] = select i1 [[CMP1_NOT]], i32 [[ADD]], i32 [[TMP1]]
; CHECK-NEXT: [[IDXPROM213:%.*]] = zext i32 [[OFFSET_0]] to i64
; CHECK-NEXT: [[ARRAYIDX3:%.*]] = getelementptr inbounds nuw float, ptr [[BASE:%.*]], i64 [[IDXPROM213]]
; CHECK-NEXT: [[TMP2:%.*]] = load float, ptr [[ARRAYIDX3]], align 4
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds nuw float, ptr [[DEST:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT: store float [[TMP2]], ptr [[ARRAYIDX5]], align 4
; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 100
; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
;
entry:
br label %for.body
for.cond.cleanup: ; preds = %for.body
ret void
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%i.014 = phi i32 [ 0, %entry ], [ %add, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %Preds, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%cmp1.not = icmp eq i32 %0, 0
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%add = add nuw nsw i32 %i.014, 1
%1 = trunc i64 %indvars.iv to i32
%offset.0 = select i1 %cmp1.not, i32 %add, i32 %1
%idxprom213 = zext i32 %offset.0 to i64
%arrayidx3 = getelementptr inbounds float, ptr %Base, i64 %idxprom213
%2 = load float, ptr %arrayidx3, align 4
%arrayidx5 = getelementptr inbounds float, ptr %Dest, i64 %indvars.iv
store float %2, ptr %arrayidx5, align 4
%exitcond.not = icmp eq i64 %indvars.iv.next, 100
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}
Reference in New Issue View Git Blame Copy Permalink