llvm/test/Transforms/LoopVectorize/multiple-strides-vectorization.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -hoist-runtime-checks=false -S < %s | FileCheck %s --check-prefix=CHECK
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -S < %s | FileCheck %s --check-prefix=CHECK-HOIST

; This is the test case from PR26314.
; When we were retrying dependence checking with memchecks only,
; the loop-invariant access in the inner loop was incorrectly determined to be wrapping
; because it was not strided in the inner loop.
; Improved wrapping detection allows vectorization in the following case.

; #define Z 32
; typedef struct s {
;       int v1[Z];
;       int v2[Z];
;       int v3[Z][Z];
; } s;
;
; void slow_function (s* const obj, int z) {
;    for (int j=0; j<Z; j++) {
;        for (int k=0; k<z; k++) {
;            int x = obj->v1[k] + obj->v2[j];
;            obj->v3[j][k] += x;
;        }
;    }
; }

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"

%struct.s = type { [32 x i32], [32 x i32], [32 x [32 x i32]] }

define void @Test(ptr nocapture %obj, i64 %z) #0 {
; CHECK-LABEL: @Test(
; CHECK-NEXT:    [[TMP1:%.*]] = shl i64 [[Z:%.*]], 2
; CHECK-NEXT:    [[TMP2:%.*]] = add i64 [[TMP1]], 256
; CHECK-NEXT:    [[SCEVGEP2:%.*]] = getelementptr i8, ptr [[OBJ:%.*]], i64 [[TMP1]]
; CHECK-NEXT:    br label [[DOTOUTER_PREHEADER:%.*]]
; CHECK:       .outer.preheader:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, [[TMP0:%.*]] ], [ [[I_NEXT:%.*]], [[DOTOUTER:%.*]] ]
; CHECK-NEXT:    [[TMP3:%.*]] = shl nuw nsw i64 [[I]], 7
; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[TMP3]], 256
; CHECK-NEXT:    [[SCEVGEP:%.*]] = getelementptr nuw i8, ptr [[OBJ]], i64 [[TMP4]]
; CHECK-NEXT:    [[TMP5:%.*]] = add i64 [[TMP2]], [[TMP3]]
; CHECK-NEXT:    [[SCEVGEP1:%.*]] = getelementptr i8, ptr [[OBJ]], i64 [[TMP5]]
; CHECK-NEXT:    [[TMP6:%.*]] = shl nuw nsw i64 [[I]], 2
; CHECK-NEXT:    [[TMP7:%.*]] = add i64 [[TMP6]], 128
; CHECK-NEXT:    [[SCEVGEP3:%.*]] = getelementptr nuw i8, ptr [[OBJ]], i64 [[TMP7]]
; CHECK-NEXT:    [[TMP8:%.*]] = add i64 [[TMP6]], 132
; CHECK-NEXT:    [[SCEVGEP4:%.*]] = getelementptr i8, ptr [[OBJ]], i64 [[TMP8]]
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds [[STRUCT_S:%.*]], ptr [[OBJ]], i64 0, i32 1, i64 [[I]]
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[Z]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_MEMCHECK:%.*]]
; CHECK:       vector.memcheck:
; CHECK-NEXT:    [[BOUND0:%.*]] = icmp ult ptr [[SCEVGEP]], [[SCEVGEP2]]
; CHECK-NEXT:    [[BOUND1:%.*]] = icmp ult ptr [[OBJ]], [[SCEVGEP1]]
; CHECK-NEXT:    [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
; CHECK-NEXT:    [[BOUND05:%.*]] = icmp ult ptr [[SCEVGEP]], [[SCEVGEP4]]
; CHECK-NEXT:    [[BOUND16:%.*]] = icmp ult ptr [[SCEVGEP3]], [[SCEVGEP1]]
; CHECK-NEXT:    [[FOUND_CONFLICT7:%.*]] = and i1 [[BOUND05]], [[BOUND16]]
; CHECK-NEXT:    [[CONFLICT_RDX:%.*]] = or i1 [[FOUND_CONFLICT]], [[FOUND_CONFLICT7]]
; CHECK-NEXT:    br i1 [[CONFLICT_RDX]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[Z]], 4
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[Z]], [[N_MOD_VF]]
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP11:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 0, i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP11]], align 4, !alias.scope [[META0:![0-9]+]]
; CHECK-NEXT:    [[TMP13:%.*]] = load i32, ptr [[TMP9]], align 4, !alias.scope [[META3:![0-9]+]]
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TMP13]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[TMP14:%.*]] = add nsw <4 x i32> [[BROADCAST_SPLAT]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 2, i64 [[I]], i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD8:%.*]] = load <4 x i32>, ptr [[TMP15]], align 4, !alias.scope [[META5:![0-9]+]], !noalias [[META7:![0-9]+]]
; CHECK-NEXT:    [[TMP17:%.*]] = add nsw <4 x i32> [[TMP14]], [[WIDE_LOAD8]]
; CHECK-NEXT:    store <4 x i32> [[TMP17]], ptr [[TMP15]], align 4, !alias.scope [[META5]], !noalias [[META7]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP18]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[Z]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label [[DOTOUTER]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[DOTOUTER_PREHEADER]] ], [ 0, [[VECTOR_MEMCHECK]] ]
; CHECK-NEXT:    br label [[DOTINNER:%.*]]
; CHECK:       .exit:
; CHECK-NEXT:    ret void
; CHECK:       .outer:
; CHECK-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT:    [[EXITCOND_OUTER:%.*]] = icmp eq i64 [[I_NEXT]], 32
; CHECK-NEXT:    br i1 [[EXITCOND_OUTER]], label [[DOTEXIT:%.*]], label [[DOTOUTER_PREHEADER]]
; CHECK:       .inner:
; CHECK-NEXT:    [[J:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[J_NEXT:%.*]], [[DOTINNER]] ]
; CHECK-NEXT:    [[TMP19:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 0, i64 [[J]]
; CHECK-NEXT:    [[TMP20:%.*]] = load i32, ptr [[TMP19]], align 4
; CHECK-NEXT:    [[TMP21:%.*]] = load i32, ptr [[TMP9]], align 4
; CHECK-NEXT:    [[TMP22:%.*]] = add nsw i32 [[TMP21]], [[TMP20]]
; CHECK-NEXT:    [[TMP23:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 2, i64 [[I]], i64 [[J]]
; CHECK-NEXT:    [[TMP24:%.*]] = load i32, ptr [[TMP23]], align 4
; CHECK-NEXT:    [[TMP25:%.*]] = add nsw i32 [[TMP22]], [[TMP24]]
; CHECK-NEXT:    store i32 [[TMP25]], ptr [[TMP23]], align 4
; CHECK-NEXT:    [[J_NEXT]] = add nuw nsw i64 [[J]], 1
; CHECK-NEXT:    [[EXITCOND_INNER:%.*]] = icmp eq i64 [[J_NEXT]], [[Z]]
; CHECK-NEXT:    br i1 [[EXITCOND_INNER]], label [[DOTOUTER]], label [[DOTINNER]], !llvm.loop [[LOOP11:![0-9]+]]
;
; CHECK-HOIST-LABEL: @Test(
; CHECK-HOIST-NEXT:    [[SCEVGEP:%.*]] = getelementptr nuw i8, ptr [[OBJ:%.*]], i64 256
; CHECK-HOIST-NEXT:    [[TMP1:%.*]] = shl i64 [[Z:%.*]], 2
; CHECK-HOIST-NEXT:    [[TMP2:%.*]] = add i64 [[TMP1]], 4224
; CHECK-HOIST-NEXT:    [[SCEVGEP1:%.*]] = getelementptr i8, ptr [[OBJ]], i64 [[TMP2]]
; CHECK-HOIST-NEXT:    [[SCEVGEP2:%.*]] = getelementptr i8, ptr [[OBJ]], i64 [[TMP1]]
; CHECK-HOIST-NEXT:    [[SCEVGEP3:%.*]] = getelementptr nuw i8, ptr [[OBJ]], i64 128
; CHECK-HOIST-NEXT:    br label [[DOTOUTER_PREHEADER:%.*]]
; CHECK-HOIST:       .outer.preheader:
; CHECK-HOIST-NEXT:    [[I:%.*]] = phi i64 [ 0, [[TMP0:%.*]] ], [ [[I_NEXT:%.*]], [[DOTOUTER:%.*]] ]
; CHECK-HOIST-NEXT:    [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_S:%.*]], ptr [[OBJ]], i64 0, i32 1, i64 [[I]]
; CHECK-HOIST-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[Z]], 4
; CHECK-HOIST-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_MEMCHECK:%.*]]
; CHECK-HOIST:       vector.memcheck:
; CHECK-HOIST-NEXT:    [[BOUND0:%.*]] = icmp ult ptr [[SCEVGEP]], [[SCEVGEP2]]
; CHECK-HOIST-NEXT:    [[BOUND1:%.*]] = icmp ult ptr [[OBJ]], [[SCEVGEP1]]
; CHECK-HOIST-NEXT:    [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
; CHECK-HOIST-NEXT:    [[BOUND14:%.*]] = icmp ult ptr [[SCEVGEP3]], [[SCEVGEP1]]
; CHECK-HOIST-NEXT:    br i1 [[FOUND_CONFLICT]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK-HOIST:       vector.ph:
; CHECK-HOIST-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[Z]], 4
; CHECK-HOIST-NEXT:    [[N_VEC:%.*]] = sub i64 [[Z]], [[N_MOD_VF]]
; CHECK-HOIST-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK-HOIST:       vector.body:
; CHECK-HOIST-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-HOIST-NEXT:    [[TMP5:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 0, i64 [[INDEX]]
; CHECK-HOIST-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP5]], align 4, !alias.scope [[META0:![0-9]+]]
; CHECK-HOIST-NEXT:    [[TMP7:%.*]] = load i32, ptr [[TMP3]], align 4, !alias.scope [[META3:![0-9]+]]
; CHECK-HOIST-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TMP7]], i64 0
; CHECK-HOIST-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
; CHECK-HOIST-NEXT:    [[TMP8:%.*]] = add nsw <4 x i32> [[BROADCAST_SPLAT]], [[WIDE_LOAD]]
; CHECK-HOIST-NEXT:    [[TMP9:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 2, i64 [[I]], i64 [[INDEX]]
; CHECK-HOIST-NEXT:    [[WIDE_LOAD5:%.*]] = load <4 x i32>, ptr [[TMP9]], align 4, !alias.scope [[META5:![0-9]+]], !noalias [[META7:![0-9]+]]
; CHECK-HOIST-NEXT:    [[TMP11:%.*]] = add nsw <4 x i32> [[TMP8]], [[WIDE_LOAD5]]
; CHECK-HOIST-NEXT:    store <4 x i32> [[TMP11]], ptr [[TMP9]], align 4, !alias.scope [[META5]], !noalias [[META7]]
; CHECK-HOIST-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-HOIST-NEXT:    [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-HOIST-NEXT:    br i1 [[TMP12]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; CHECK-HOIST:       middle.block:
; CHECK-HOIST-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[Z]], [[N_VEC]]
; CHECK-HOIST-NEXT:    br i1 [[CMP_N]], label [[DOTOUTER]], label [[SCALAR_PH]]
; CHECK-HOIST:       scalar.ph:
; CHECK-HOIST-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[DOTOUTER_PREHEADER]] ], [ 0, [[VECTOR_MEMCHECK]] ]
; CHECK-HOIST-NEXT:    br label [[DOTINNER:%.*]]
; CHECK-HOIST:       .exit:
; CHECK-HOIST-NEXT:    ret void
; CHECK-HOIST:       .outer:
; CHECK-HOIST-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; CHECK-HOIST-NEXT:    [[EXITCOND_OUTER:%.*]] = icmp eq i64 [[I_NEXT]], 32
; CHECK-HOIST-NEXT:    br i1 [[EXITCOND_OUTER]], label [[DOTEXIT:%.*]], label [[DOTOUTER_PREHEADER]]
; CHECK-HOIST:       .inner:
; CHECK-HOIST-NEXT:    [[J:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[J_NEXT:%.*]], [[DOTINNER]] ]
; CHECK-HOIST-NEXT:    [[TMP13:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 0, i64 [[J]]
; CHECK-HOIST-NEXT:    [[TMP14:%.*]] = load i32, ptr [[TMP13]], align 4
; CHECK-HOIST-NEXT:    [[TMP15:%.*]] = load i32, ptr [[TMP3]], align 4
; CHECK-HOIST-NEXT:    [[TMP16:%.*]] = add nsw i32 [[TMP15]], [[TMP14]]
; CHECK-HOIST-NEXT:    [[TMP17:%.*]] = getelementptr inbounds [[STRUCT_S]], ptr [[OBJ]], i64 0, i32 2, i64 [[I]], i64 [[J]]
; CHECK-HOIST-NEXT:    [[TMP18:%.*]] = load i32, ptr [[TMP17]], align 4
; CHECK-HOIST-NEXT:    [[TMP19:%.*]] = add nsw i32 [[TMP16]], [[TMP18]]
; CHECK-HOIST-NEXT:    store i32 [[TMP19]], ptr [[TMP17]], align 4
; CHECK-HOIST-NEXT:    [[J_NEXT]] = add nuw nsw i64 [[J]], 1
; CHECK-HOIST-NEXT:    [[EXITCOND_INNER:%.*]] = icmp eq i64 [[J_NEXT]], [[Z]]
; CHECK-HOIST-NEXT:    br i1 [[EXITCOND_INNER]], label [[DOTOUTER]], label [[DOTINNER]], !llvm.loop [[LOOP11:![0-9]+]]
;
  br label %.outer.preheader


.outer.preheader:
  %i = phi i64 [ 0, %0 ], [ %i.next, %.outer ]
  %1 = getelementptr inbounds %struct.s, ptr %obj, i64 0, i32 1, i64 %i
  br label %.inner

.exit:
  ret void

.outer:
  %i.next = add nuw nsw i64 %i, 1
  %exitcond.outer = icmp eq i64 %i.next, 32
  br i1 %exitcond.outer, label %.exit, label %.outer.preheader

.inner:
  %j = phi i64 [ 0, %.outer.preheader ], [ %j.next, %.inner ]
  %2 = getelementptr inbounds %struct.s, ptr %obj, i64 0, i32 0, i64 %j
  %3 = load i32, ptr %2
  %4 = load i32, ptr %1
  %5 = add nsw i32 %4, %3
  %6 = getelementptr inbounds %struct.s, ptr %obj, i64 0, i32 2, i64 %i, i64 %j
  %7 = load i32, ptr %6
  %8 = add nsw i32 %5, %7
  store i32 %8, ptr %6
  %j.next = add nuw nsw i64 %j, 1
  %exitcond.inner = icmp eq i64 %j.next, %z
  br i1 %exitcond.inner, label %.outer, label %.inner
}