; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=loop-vectorize -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue < %s | FileCheck %s
; RUN: opt -S -passes=loop-vectorize < %s | FileCheck %s
; This tests should produce the same result as with default options, and when tail folding
; is preferred, because the vectorizer can't fold the tail by masking (due to an
; outside user of %incdec.ptr in %end) and should fallback to a scalar epilogue.
;
; The first test (@basic_loop) simply relies on the command-line switches.
; The second test (@metadata) specificies its tail-folding preference via metadata.
; Both tests should always generate a scalar epilogue.
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
define void @basic_loop(i8* nocapture readonly %ptr, i32 %size, i8** %pos) {
; CHECK-LABEL: @basic_loop(
; CHECK-NEXT: header:
; CHECK-NEXT: [[PTR0:%.*]] = load i8*, i8** [[POS:%.*]], align 4
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[SIZE:%.*]], 4
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[SIZE]], 4
; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[SIZE]], [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = sub i32 [[SIZE]], [[N_VEC]]
; CHECK-NEXT: [[IND_END2:%.*]] = getelementptr i8, i8* [[PTR:%.*]], i32 [[N_VEC]]
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, i8* [[PTR]], i32 [[TMP1]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP]], i32 1
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, i8* [[TMP2]], i32 0
; CHECK-NEXT: [[TMP4:%.*]] = bitcast i8* [[TMP3]] to <4 x i8>*
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i8>, <4 x i8>* [[TMP4]], align 1
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i8, i8* [[NEXT_GEP]], i32 0
; CHECK-NEXT: [[TMP6:%.*]] = bitcast i8* [[TMP5]] to <4 x i8>*
; CHECK-NEXT: store <4 x i8> [[WIDE_LOAD]], <4 x i8>* [[TMP6]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[SIZE]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label [[END:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ [[SIZE]], [[HEADER:%.*]] ]
; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi i8* [ [[IND_END2]], [[MIDDLE_BLOCK]] ], [ [[PTR]], [[HEADER]] ]
; CHECK-NEXT: br label [[BODY:%.*]]
; CHECK: body:
; CHECK-NEXT: [[DEC66:%.*]] = phi i32 [ [[DEC:%.*]], [[BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT: [[BUFF:%.*]] = phi i8* [ [[INCDEC_PTR:%.*]], [[BODY]] ], [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ]
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, i8* [[BUFF]], i32 1
; CHECK-NEXT: [[DEC]] = add nsw i32 [[DEC66]], -1
; CHECK-NEXT: [[TMP8:%.*]] = load i8, i8* [[INCDEC_PTR]], align 1
; CHECK-NEXT: store i8 [[TMP8]], i8* [[BUFF]], align 1
; CHECK-NEXT: [[TOBOOL11:%.*]] = icmp eq i32 [[DEC]], 0
; CHECK-NEXT: br i1 [[TOBOOL11]], label [[END]], label [[BODY]], !llvm.loop [[LOOP2:![0-9]+]]
; CHECK: end:
; CHECK-NEXT: [[INCDEC_PTR_LCSSA:%.*]] = phi i8* [ [[INCDEC_PTR]], [[BODY]] ], [ [[IND_END2]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: store i8* [[INCDEC_PTR_LCSSA]], i8** [[POS]], align 4
; CHECK-NEXT: ret void
;
header:
%ptr0 = load i8*, i8** %pos, align 4
br label %body
body:
%dec66 = phi i32 [ %dec, %body ], [ %size, %header ]
%buff = phi i8* [ %incdec.ptr, %body ], [ %ptr, %header ]
%incdec.ptr = getelementptr inbounds i8, i8* %buff, i32 1
%dec = add nsw i32 %dec66, -1
%0 = load i8, i8* %incdec.ptr, align 1
store i8 %0, i8* %buff, align 1
%tobool11 = icmp eq i32 %dec, 0
br i1 %tobool11, label %end, label %body
end:
store i8* %incdec.ptr, i8** %pos, align 4
ret void
}
define void @metadata(i8* nocapture readonly %ptr, i32 %size, i8** %pos) {
; CHECK-LABEL: @metadata(
; CHECK-NEXT: header:
; CHECK-NEXT: [[PTR0:%.*]] = load i8*, i8** [[POS:%.*]], align 4
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[SIZE:%.*]], 4
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[SIZE]], 4
; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[SIZE]], [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = sub i32 [[SIZE]], [[N_VEC]]
; CHECK-NEXT: [[IND_END2:%.*]] = getelementptr i8, i8* [[PTR:%.*]], i32 [[N_VEC]]
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[INDEX]], 0
; CHECK-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, i8* [[PTR]], i32 [[TMP1]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP]], i32 1
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i8, i8* [[TMP2]], i32 0
; CHECK-NEXT: [[TMP4:%.*]] = bitcast i8* [[TMP3]] to <4 x i8>*
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i8>, <4 x i8>* [[TMP4]], align 1
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i8, i8* [[NEXT_GEP]], i32 0
; CHECK-NEXT: [[TMP6:%.*]] = bitcast i8* [[TMP5]] to <4 x i8>*
; CHECK-NEXT: store <4 x i8> [[WIDE_LOAD]], <4 x i8>* [[TMP6]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[SIZE]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label [[END:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ [[SIZE]], [[HEADER:%.*]] ]
; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi i8* [ [[IND_END2]], [[MIDDLE_BLOCK]] ], [ [[PTR]], [[HEADER]] ]
; CHECK-NEXT: br label [[BODY:%.*]]
; CHECK: body:
; CHECK-NEXT: [[DEC66:%.*]] = phi i32 [ [[DEC:%.*]], [[BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT: [[BUFF:%.*]] = phi i8* [ [[INCDEC_PTR:%.*]], [[BODY]] ], [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ]
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, i8* [[BUFF]], i32 1
; CHECK-NEXT: [[DEC]] = add nsw i32 [[DEC66]], -1
; CHECK-NEXT: [[TMP8:%.*]] = load i8, i8* [[INCDEC_PTR]], align 1
; CHECK-NEXT: store i8 [[TMP8]], i8* [[BUFF]], align 1
; CHECK-NEXT: [[TOBOOL11:%.*]] = icmp eq i32 [[DEC]], 0
; CHECK-NEXT: br i1 [[TOBOOL11]], label [[END]], label [[BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: end:
; CHECK-NEXT: [[INCDEC_PTR_LCSSA:%.*]] = phi i8* [ [[INCDEC_PTR]], [[BODY]] ], [ [[IND_END2]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT: store i8* [[INCDEC_PTR_LCSSA]], i8** [[POS]], align 4
; CHECK-NEXT: ret void
;
header:
%ptr0 = load i8*, i8** %pos, align 4
br label %body
body:
%dec66 = phi i32 [ %dec, %body ], [ %size, %header ]
%buff = phi i8* [ %incdec.ptr, %body ], [ %ptr, %header ]
%incdec.ptr = getelementptr inbounds i8, i8* %buff, i32 1
%dec = add nsw i32 %dec66, -1
%0 = load i8, i8* %incdec.ptr, align 1
store i8 %0, i8* %buff, align 1
%tobool11 = icmp eq i32 %dec, 0
br i1 %tobool11, label %end, label %body, !llvm.loop !1
end:
store i8* %incdec.ptr, i8** %pos, align 4
ret void
}
!1 = distinct !{!1, !2, !3}
!2 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
!3 = !{!"llvm.loop.vectorize.enable", i1 true}