99d6c6d936
This patch moves branch condition creation to enter the scalar epilogue loop to VPlan. Modeling the branch in the middle block also requires modeling the successor blocks. This is done using the recently introduced VPIRBasicBlock. Note that the middle.block is still created as part of the skeleton and then patched in during VPlan execution. Unfortunately the skeleton needs to create the middle.block early on, as it is also used for induction resume value creation and is also needed to properly update the dominator tree during skeleton creation. After this patch lands, I plan to move induction resume value and phi node creation in the scalar preheader to VPlan. Once that is done, we should be able to create the middle.block in VPlan directly. This is a re-worked version based on the earlier https://reviews.llvm.org/D150398 and the main change is the use of VPIRBasicBlock. Depends on https://github.com/llvm/llvm-project/pull/92525 PR: https://github.com/llvm/llvm-project/pull/92651
102 lines
5.9 KiB
LLVM
102 lines
5.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=loop-vectorize -mtriple=s390x-ibm-linux -mcpu=z13 -force-vector-width=2 -S %s | FileCheck %s
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; Test case from PR44020.
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; In func_21, %rec forms a first order recurrence and we predicate to avoid
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; scalar iteration overhead for a low trip count loop. Make sure we pick
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; the correct insertion point when fixing first order recurrences.
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@A = external dso_local global [5 x i32], align 4
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@B = external dso_local global [5 x i32], align 4
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define void @func_21() {
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; CHECK-LABEL: @func_21(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE4:%.*]] ]
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; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <2 x i32> [ <i32 poison, i32 0>, [[VECTOR_PH]] ], [ [[TMP12:%.*]], [[PRED_STORE_CONTINUE4]] ]
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; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[PRED_STORE_CONTINUE4]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
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; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[INDEX]], 1
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; CHECK-NEXT: [[TMP2:%.*]] = icmp ule <2 x i64> [[VEC_IND]], <i64 4, i64 4>
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <2 x i1> [[TMP2]], i32 0
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; CHECK-NEXT: br i1 [[TMP3]], label [[PRED_LOAD_IF:%.*]], label [[PRED_LOAD_CONTINUE:%.*]]
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; CHECK: pred.load.if:
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds [5 x i32], ptr @A, i64 0, i64 [[TMP0]]
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; CHECK-NEXT: [[TMP5:%.*]] = load i32, ptr [[TMP4]], align 4
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; CHECK-NEXT: [[TMP6:%.*]] = insertelement <2 x i32> poison, i32 [[TMP5]], i32 0
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; CHECK-NEXT: br label [[PRED_LOAD_CONTINUE]]
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; CHECK: pred.load.continue:
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; CHECK-NEXT: [[TMP7:%.*]] = phi <2 x i32> [ poison, [[VECTOR_BODY]] ], [ [[TMP6]], [[PRED_LOAD_IF]] ]
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; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i1> [[TMP2]], i32 1
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; CHECK-NEXT: br i1 [[TMP8]], label [[PRED_LOAD_IF1:%.*]], label [[PRED_LOAD_CONTINUE2:%.*]]
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; CHECK: pred.load.if1:
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; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds [5 x i32], ptr @A, i64 0, i64 [[TMP1]]
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; CHECK-NEXT: [[TMP10:%.*]] = load i32, ptr [[TMP9]], align 4
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; CHECK-NEXT: [[TMP11:%.*]] = insertelement <2 x i32> [[TMP7]], i32 [[TMP10]], i32 1
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; CHECK-NEXT: br label [[PRED_LOAD_CONTINUE2]]
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; CHECK: pred.load.continue2:
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; CHECK-NEXT: [[TMP12]] = phi <2 x i32> [ [[TMP7]], [[PRED_LOAD_CONTINUE]] ], [ [[TMP11]], [[PRED_LOAD_IF1]] ]
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; CHECK-NEXT: [[TMP13:%.*]] = shufflevector <2 x i32> [[VECTOR_RECUR]], <2 x i32> [[TMP12]], <2 x i32> <i32 1, i32 2>
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; CHECK-NEXT: [[TMP14:%.*]] = extractelement <2 x i1> [[TMP2]], i32 0
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; CHECK-NEXT: br i1 [[TMP14]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
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; CHECK: pred.store.if:
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; CHECK-NEXT: [[TMP15:%.*]] = getelementptr inbounds [5 x i32], ptr @B, i64 0, i64 [[TMP0]]
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; CHECK-NEXT: [[TMP16:%.*]] = extractelement <2 x i32> [[TMP13]], i32 0
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; CHECK-NEXT: store i32 [[TMP16]], ptr [[TMP15]], align 4
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE]]
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; CHECK: pred.store.continue:
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; CHECK-NEXT: [[TMP17:%.*]] = extractelement <2 x i1> [[TMP2]], i32 1
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; CHECK-NEXT: br i1 [[TMP17]], label [[PRED_STORE_IF3:%.*]], label [[PRED_STORE_CONTINUE4]]
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; CHECK: pred.store.if3:
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; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds [5 x i32], ptr @B, i64 0, i64 [[TMP1]]
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; CHECK-NEXT: [[TMP19:%.*]] = extractelement <2 x i32> [[TMP13]], i32 1
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; CHECK-NEXT: store i32 [[TMP19]], ptr [[TMP18]], align 4
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE4]]
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; CHECK: pred.store.continue4:
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; CHECK-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], 2
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <2 x i64> [[VEC_IND]], <i64 2, i64 2>
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; CHECK-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], 6
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; CHECK-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <2 x i32> [[TMP12]], i32 1
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; CHECK-NEXT: br i1 true, label [[EXIT:%.*]], label [[SCALAR_PH]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i32 [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 6, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i32 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[LV:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[A_PTR:%.*]] = getelementptr inbounds [5 x i32], ptr @A, i64 0, i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[LV]] = load i32, ptr [[A_PTR]], align 4
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; CHECK-NEXT: [[B_PTR:%.*]] = getelementptr inbounds [5 x i32], ptr @B, i64 0, i64 [[INDVARS_IV]]
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; CHECK-NEXT: store i32 [[SCALAR_RECUR]], ptr [[B_PTR]], align 4
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 5
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT]], label [[LOOP]], [[LOOP2:!llvm.loop !.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop: ; preds = %loop, %entry
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%rec = phi i32 [ 0, %entry], [ %lv, %loop ]
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%indvars.iv = phi i64 [ 0, %entry], [ %indvars.iv.next, %loop ]
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%A.ptr= getelementptr inbounds [5 x i32], ptr @A, i64 0, i64 %indvars.iv
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%lv = load i32, ptr %A.ptr, align 4
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%B.ptr = getelementptr inbounds [5 x i32], ptr @B, i64 0, i64 %indvars.iv
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store i32 %rec, ptr %B.ptr, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 5
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br i1 %exitcond, label %exit, label %loop
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exit: ; preds = %loop
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ret void
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}
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