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llvm-project/llvm/test/Transforms/LoopVectorize/vectorize-force-tail-with-evl.ll
Hassnaa Hamdi 6b201d512a [LV][NFC] Rename PreferPredicateOverEpilogue to TailFoldingPolicy (#191803) 
Rename the -prefer-predicate-over-epilogue flag and its associated
enum values to use 'TailFold' terminology instead of 'Predicate'. The
term 'Predicate' is overloaded in the vectorizer context and would
cause further confusion as more tail-folding styles are added.
2026-04-20 16:29:51 +01:00

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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize \
; RUN: -force-tail-folding-style=data-with-evl \
; RUN: -tail-folding-policy=must-fold-tail \
; RUN: -force-target-supports-scalable-vectors -scalable-vectorization=on -S < %s | FileCheck --check-prefix=IF-EVL %s
; RUN: opt -passes=loop-vectorize \
; RUN: -force-tail-folding-style=none \
; RUN: -tail-folding-policy=prefer-fold-tail -force-vector-width=4 \
; RUN: -force-target-supports-scalable-vectors -scalable-vectorization=on -S < %s | FileCheck --check-prefix=NO-VP %s
; RUN: opt -passes=loop-vectorize \
; RUN: -force-tail-folding-style=none \
; RUN: -tail-folding-policy=prefer-fold-tail \
; RUN: -force-target-supports-scalable-vectors -scalable-vectorization=on -S < %s | FileCheck --check-prefix=NO-VP-DEF %s
; The target does not support predicated vectorization.
define void @foo(ptr noalias %a, ptr noalias %b, ptr noalias %c, i64 %N) {
; IF-EVL-LABEL: @foo(
; IF-EVL-NEXT: entry:
; IF-EVL-NEXT: br label [[FOR_BODY:%.*]]
; IF-EVL: for.body:
; IF-EVL-NEXT: [[IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; IF-EVL-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[B:%.*]], i64 [[IV]]
; IF-EVL-NEXT: [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; IF-EVL-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, ptr [[C:%.*]], i64 [[IV]]
; IF-EVL-NEXT: [[TMP1:%.*]] = load i32, ptr [[ARRAYIDX2]], align 4
; IF-EVL-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP1]], [[TMP0]]
; IF-EVL-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IV]]
; IF-EVL-NEXT: store i32 [[ADD]], ptr [[ARRAYIDX4]], align 4
; IF-EVL-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; IF-EVL-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N:%.*]]
; IF-EVL-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
; IF-EVL: for.cond.cleanup:
; IF-EVL-NEXT: ret void
;
; NO-VP-LABEL: @foo(
; NO-VP-NEXT: entry:
; NO-VP-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT: [[TMP8:%.*]] = shl nuw i64 [[TMP0]], 2
; NO-VP-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], [[TMP8]]
; NO-VP-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; NO-VP: vector.ph:
; NO-VP-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT: [[TMP14:%.*]] = shl nuw i64 [[TMP1]], 2
; NO-VP-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP14]]
; NO-VP-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; NO-VP-NEXT: br label [[VECTOR_BODY:%.*]]
; NO-VP: vector.body:
; NO-VP-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; NO-VP-NEXT: [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[B:%.*]], i64 [[INDEX]]
; NO-VP-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 4 x i32>, ptr [[TMP4]], align 4
; NO-VP-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[C:%.*]], i64 [[INDEX]]
; NO-VP-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 4 x i32>, ptr [[TMP6]], align 4
; NO-VP-NEXT: [[TMP16:%.*]] = add nsw <vscale x 4 x i32> [[WIDE_LOAD1]], [[WIDE_LOAD]]
; NO-VP-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDEX]]
; NO-VP-NEXT: store <vscale x 4 x i32> [[TMP16]], ptr [[TMP9]], align 4
; NO-VP-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP14]]
; NO-VP-NEXT: [[TMP11:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; NO-VP-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; NO-VP: middle.block:
; NO-VP-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; NO-VP-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; NO-VP: scalar.ph:
; NO-VP-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; NO-VP-NEXT: br label [[FOR_BODY:%.*]]
; NO-VP: for.body:
; NO-VP-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; NO-VP-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]]
; NO-VP-NEXT: [[TMP12:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; NO-VP-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]]
; NO-VP-NEXT: [[TMP13:%.*]] = load i32, ptr [[ARRAYIDX2]], align 4
; NO-VP-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP13]], [[TMP12]]
; NO-VP-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]]
; NO-VP-NEXT: store i32 [[ADD]], ptr [[ARRAYIDX4]], align 4
; NO-VP-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; NO-VP-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; NO-VP-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; NO-VP: for.cond.cleanup:
; NO-VP-NEXT: ret void
;
; NO-VP-DEF-LABEL: @foo(
; NO-VP-DEF-NEXT: entry:
; NO-VP-DEF-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-DEF-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N:%.*]], [[TMP0]]
; NO-VP-DEF-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; NO-VP-DEF: vector.ph:
; NO-VP-DEF-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-DEF-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP1]]
; NO-VP-DEF-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; NO-VP-DEF-NEXT: br label [[VECTOR_BODY:%.*]]
; NO-VP-DEF: vector.body:
; NO-VP-DEF-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; NO-VP-DEF-NEXT: [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[B:%.*]], i64 [[INDEX]]
; NO-VP-DEF-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 1 x i32>, ptr [[TMP4]], align 4
; NO-VP-DEF-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[C:%.*]], i64 [[INDEX]]
; NO-VP-DEF-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 1 x i32>, ptr [[TMP6]], align 4
; NO-VP-DEF-NEXT: [[TMP8:%.*]] = add nsw <vscale x 1 x i32> [[WIDE_LOAD1]], [[WIDE_LOAD]]
; NO-VP-DEF-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDEX]]
; NO-VP-DEF-NEXT: store <vscale x 1 x i32> [[TMP8]], ptr [[TMP9]], align 4
; NO-VP-DEF-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; NO-VP-DEF-NEXT: [[TMP11:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; NO-VP-DEF-NEXT: br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; NO-VP-DEF: middle.block:
; NO-VP-DEF-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; NO-VP-DEF-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP:%.*]], label [[SCALAR_PH]]
; NO-VP-DEF: scalar.ph:
; NO-VP-DEF-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; NO-VP-DEF-NEXT: br label [[FOR_BODY:%.*]]
; NO-VP-DEF: for.body:
; NO-VP-DEF-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; NO-VP-DEF-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[IV]]
; NO-VP-DEF-NEXT: [[TMP12:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
; NO-VP-DEF-NEXT: [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[IV]]
; NO-VP-DEF-NEXT: [[TMP13:%.*]] = load i32, ptr [[ARRAYIDX2]], align 4
; NO-VP-DEF-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP13]], [[TMP12]]
; NO-VP-DEF-NEXT: [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]]
; NO-VP-DEF-NEXT: store i32 [[ADD]], ptr [[ARRAYIDX4]], align 4
; NO-VP-DEF-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; NO-VP-DEF-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; NO-VP-DEF-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; NO-VP-DEF: for.cond.cleanup:
; NO-VP-DEF-NEXT: ret void
;
entry:
br label %for.body
for.body:
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %b, i64 %iv
%0 = load i32, ptr %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, ptr %c, i64 %iv
%1 = load i32, ptr %arrayidx2, align 4
%add = add nsw i32 %1, %0
%arrayidx4 = getelementptr inbounds i32, ptr %a, i64 %iv
store i32 %add, ptr %arrayidx4, align 4
%iv.next = add nuw nsw i64 %iv, 1
%exitcond.not = icmp eq i64 %iv.next, %N
br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
for.cond.cleanup:
ret void
}
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