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[LV] Remove assertions in IV overflow check #115705

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merged 4 commits into from
Nov 14, 2024
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[LV] Remove assertions in IV overflow check #115705

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13feed4
[LV] Use SCEV to check if IV overflow check is known
lukel97 Nov 11, 2024
4ba9c49
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lukel97 Nov 11, 2024
e3c2509
Rework to just remove the assert and not try to infer anything from S…
lukel97 Nov 12, 2024
4fed4aa
Use CreateStep
lukel97 Nov 14, 2024
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9 changes: 0 additions & 9 deletions llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2491,15 +2491,6 @@ void InnerLoopVectorizer::emitIterationCountCheck(BasicBlock *Bypass) {
Value *LHS = Builder.CreateSub(MaxUIntTripCount, Count);

Value *Step = CreateStep();
#ifndef NDEBUG
ScalarEvolution &SE = *PSE.getSE();
const SCEV *TC2OverflowSCEV = SE.applyLoopGuards(SE.getSCEV(LHS), OrigLoop);
assert(
!isIndvarOverflowCheckKnownFalse(Cost, VF * UF) &&
!SE.isKnownPredicate(CmpInst::getInversePredicate(ICmpInst::ICMP_ULT),
TC2OverflowSCEV, SE.getSCEV(Step)) &&
"unexpectedly proved overflow check to be known");
#endif
// Don't execute the vector loop if (UMax - n) < (VF * UF).
CheckMinIters = Builder.CreateICmp(ICmpInst::ICMP_ULT, LHS, Step);
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Suggested change
CheckMinIters = Builder.CreateICmp(ICmpInst::ICMP_ULT, LHS, Step);
CheckMinIters = Builder.CreateICmp(ICmpInst::ICMP_ULT, LHS, CreateStep());

}
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241 changes: 241 additions & 0 deletions llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-known-no-overflow.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,241 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes=loop-vectorize \
; RUN: -force-tail-folding-style=data-with-evl \
; RUN: -prefer-predicate-over-epilogue=predicate-dont-vectorize \
; RUN: -mtriple=riscv64 -mattr=+v -S < %s | FileCheck %s

; TODO: We know the IV will never overflow here so we can skip the overflow
; check

define void @trip_count_max_1024(ptr %p, i64 %tc) vscale_range(2, 1024) {
; CHECK-LABEL: define void @trip_count_max_1024(
; CHECK-SAME: ptr [[P:%.*]], i64 [[TC:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[GUARD:%.*]] = icmp ugt i64 [[TC]], 1024
; CHECK-NEXT: br i1 [[GUARD]], label %[[EXIT:.*]], label %[[LOOP_PREHEADER:.*]]
; CHECK: [[LOOP_PREHEADER]]:
; CHECK-NEXT: [[UMAX:%.*]] = call i64 @llvm.umax.i64(i64 [[TC]], i64 1)
; CHECK-NEXT: [[TMP0:%.*]] = sub i64 -1, [[UMAX]]
; CHECK-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP2:%.*]] = mul i64 [[TMP1]], 2
; CHECK-NEXT: [[TMP3:%.*]] = icmp ult i64 [[TMP0]], [[TMP2]]
; CHECK-NEXT: br i1 [[TMP3]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP5:%.*]] = mul i64 [[TMP4]], 2
; CHECK-NEXT: [[TMP6:%.*]] = sub i64 [[TMP5]], 1
; CHECK-NEXT: [[N_RND_UP:%.*]] = add i64 [[UMAX]], [[TMP6]]
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP5]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP8:%.*]] = mul i64 [[TMP7]], 2
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[EVL_BASED_IV:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[AVL:%.*]] = sub i64 [[UMAX]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[TMP9:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 2, i1 true)
; CHECK-NEXT: [[TMP10:%.*]] = add i64 [[EVL_BASED_IV]], 0
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr i64, ptr [[P]], i64 [[TMP10]]
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr i64, ptr [[TMP11]], i32 0
; CHECK-NEXT: [[VP_OP_LOAD:%.*]] = call <vscale x 2 x i64> @llvm.vp.load.nxv2i64.p0(ptr align 8 [[TMP12]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: [[VP_OP:%.*]] = call <vscale x 2 x i64> @llvm.vp.add.nxv2i64(<vscale x 2 x i64> [[VP_OP_LOAD]], <vscale x 2 x i64> shufflevector (<vscale x 2 x i64> insertelement (<vscale x 2 x i64> poison, i64 1, i64 0), <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer), <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: call void @llvm.vp.store.nxv2i64.p0(<vscale x 2 x i64> [[VP_OP]], ptr align 8 [[TMP12]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: [[TMP13:%.*]] = zext i32 [[TMP9]] to i64
; CHECK-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP13]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], [[TMP8]]
; CHECK-NEXT: [[TMP14:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP14]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 true, label %[[EXIT_LOOPEXIT:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[LOOP_PREHEADER]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i64, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[GEP]], align 8
; CHECK-NEXT: [[Y:%.*]] = add i64 [[X]], 1
; CHECK-NEXT: store i64 [[Y]], ptr [[GEP]], align 8
; CHECK-NEXT: [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT: [[DONE:%.*]] = icmp uge i64 [[I_NEXT]], [[TC]]
; CHECK-NEXT: br i1 [[DONE]], label %[[EXIT_LOOPEXIT]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK: [[EXIT_LOOPEXIT]]:
; CHECK-NEXT: br label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
%guard = icmp ugt i64 %tc, 1024
br i1 %guard, label %exit, label %loop
loop:
%i = phi i64 [%i.next, %loop], [0, %entry]
%gep = getelementptr i64, ptr %p, i64 %i
%x = load i64, ptr %gep
%y = add i64 %x, 1
store i64 %y, ptr %gep
%i.next = add i64 %i, 1
%done = icmp uge i64 %i.next, %tc
br i1 %done, label %exit, label %loop
exit:
ret void
}

; If %tc = 0 the IV will overflow, so we need to emit an overflow check
; FIXME: The check still allows %tc =0

define void @overflow_at_0(ptr %p, i64 %tc) vscale_range(2, 1024) {
; CHECK-LABEL: define void @overflow_at_0(
; CHECK-SAME: ptr [[P:%.*]], i64 [[TC:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[GUARD:%.*]] = icmp ugt i64 [[TC]], 1024
; CHECK-NEXT: br i1 [[GUARD]], label %[[EXIT:.*]], label %[[LOOP_PREHEADER:.*]]
; CHECK: [[LOOP_PREHEADER]]:
; CHECK-NEXT: [[TMP0:%.*]] = sub i64 -1, [[TC]]
; CHECK-NEXT: [[TMP1:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP2:%.*]] = mul i64 [[TMP1]], 2
; CHECK-NEXT: [[TMP3:%.*]] = icmp ult i64 [[TMP0]], [[TMP2]]
; CHECK-NEXT: br i1 [[TMP3]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP5:%.*]] = mul i64 [[TMP4]], 2
; CHECK-NEXT: [[TMP6:%.*]] = sub i64 [[TMP5]], 1
; CHECK-NEXT: [[N_RND_UP:%.*]] = add i64 [[TC]], [[TMP6]]
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP5]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP8:%.*]] = mul i64 [[TMP7]], 2
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[EVL_BASED_IV:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[AVL:%.*]] = sub i64 [[TC]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[TMP9:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 2, i1 true)
; CHECK-NEXT: [[TMP10:%.*]] = add i64 [[EVL_BASED_IV]], 0
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr i64, ptr [[P]], i64 [[TMP10]]
; CHECK-NEXT: [[TMP12:%.*]] = getelementptr i64, ptr [[TMP11]], i32 0
; CHECK-NEXT: [[VP_OP_LOAD:%.*]] = call <vscale x 2 x i64> @llvm.vp.load.nxv2i64.p0(ptr align 8 [[TMP12]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: [[VP_OP:%.*]] = call <vscale x 2 x i64> @llvm.vp.add.nxv2i64(<vscale x 2 x i64> [[VP_OP_LOAD]], <vscale x 2 x i64> shufflevector (<vscale x 2 x i64> insertelement (<vscale x 2 x i64> poison, i64 1, i64 0), <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer), <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: call void @llvm.vp.store.nxv2i64.p0(<vscale x 2 x i64> [[VP_OP]], ptr align 8 [[TMP12]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP9]])
; CHECK-NEXT: [[TMP13:%.*]] = zext i32 [[TMP9]] to i64
; CHECK-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP13]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], [[TMP8]]
; CHECK-NEXT: [[TMP14:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP14]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 true, label %[[EXIT_LOOPEXIT:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[LOOP_PREHEADER]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i64, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[GEP]], align 8
; CHECK-NEXT: [[Y:%.*]] = add i64 [[X]], 1
; CHECK-NEXT: store i64 [[Y]], ptr [[GEP]], align 8
; CHECK-NEXT: [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[TC]]
; CHECK-NEXT: br i1 [[DONE]], label %[[EXIT_LOOPEXIT]], label %[[LOOP]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK: [[EXIT_LOOPEXIT]]:
; CHECK-NEXT: br label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
%guard = icmp ugt i64 %tc, 1024
br i1 %guard, label %exit, label %loop
loop:
%i = phi i64 [%i.next, %loop], [0, %entry]
%gep = getelementptr i64, ptr %p, i64 %i
%x = load i64, ptr %gep
%y = add i64 %x, 1
store i64 %y, ptr %gep
%i.next = add i64 %i, 1
%done = icmp eq i64 %i.next, %tc
br i1 %done, label %exit, label %loop
exit:
ret void
}

; %tc won't = 0 so the IV won't overflow

define void @no_overflow_at_0(ptr %p, i64 %tc) vscale_range(2, 1024) {
; CHECK-LABEL: define void @no_overflow_at_0(
; CHECK-SAME: ptr [[P:%.*]], i64 [[TC:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TC_ADD:%.*]] = add i64 [[TC]], 1
; CHECK-NEXT: [[GUARD:%.*]] = icmp ugt i64 [[TC]], 1024
; CHECK-NEXT: br i1 [[GUARD]], label %[[EXIT:.*]], label %[[LOOP_PREHEADER:.*]]
; CHECK: [[LOOP_PREHEADER]]:
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP1:%.*]] = mul i64 [[TMP0]], 2
; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[TMP1]], 1
; CHECK-NEXT: [[N_RND_UP:%.*]] = add i64 [[TC_ADD]], [[TMP2]]
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP1]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP3:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP4:%.*]] = mul i64 [[TMP3]], 2
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[EVL_BASED_IV:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[AVL:%.*]] = sub i64 [[TC_ADD]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[TMP5:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 2, i1 true)
; CHECK-NEXT: [[TMP6:%.*]] = add i64 [[EVL_BASED_IV]], 0
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr i64, ptr [[P]], i64 [[TMP6]]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr i64, ptr [[TMP7]], i32 0
; CHECK-NEXT: [[VP_OP_LOAD:%.*]] = call <vscale x 2 x i64> @llvm.vp.load.nxv2i64.p0(ptr align 8 [[TMP8]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP5]])
; CHECK-NEXT: [[VP_OP:%.*]] = call <vscale x 2 x i64> @llvm.vp.add.nxv2i64(<vscale x 2 x i64> [[VP_OP_LOAD]], <vscale x 2 x i64> shufflevector (<vscale x 2 x i64> insertelement (<vscale x 2 x i64> poison, i64 1, i64 0), <vscale x 2 x i64> poison, <vscale x 2 x i32> zeroinitializer), <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP5]])
; CHECK-NEXT: call void @llvm.vp.store.nxv2i64.p0(<vscale x 2 x i64> [[VP_OP]], ptr align 8 [[TMP8]], <vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), i32 [[TMP5]])
; CHECK-NEXT: [[TMP9:%.*]] = zext i32 [[TMP5]] to i64
; CHECK-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP9]], [[EVL_BASED_IV]]
; CHECK-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], [[TMP4]]
; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP10]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
; CHECK-NEXT: br i1 true, label %[[EXIT_LOOPEXIT:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[LOOP_PREHEADER]] ]
; CHECK-NEXT: br label %[[LOOP:.*]]
; CHECK: [[LOOP]]:
; CHECK-NEXT: [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
; CHECK-NEXT: [[GEP:%.*]] = getelementptr i64, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[X:%.*]] = load i64, ptr [[GEP]], align 8
; CHECK-NEXT: [[Y:%.*]] = add i64 [[X]], 1
; CHECK-NEXT: store i64 [[Y]], ptr [[GEP]], align 8
; CHECK-NEXT: [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[TC_ADD]]
; CHECK-NEXT: br i1 [[DONE]], label %[[EXIT_LOOPEXIT]], label %[[LOOP]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK: [[EXIT_LOOPEXIT]]:
; CHECK-NEXT: br label %[[EXIT]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: ret void
;
entry:
%tc.add = add nuw i64 %tc, 1
%guard = icmp ugt i64 %tc, 1024
br i1 %guard, label %exit, label %loop
loop:
%i = phi i64 [%i.next, %loop], [0, %entry]
%gep = getelementptr i64, ptr %p, i64 %i
%x = load i64, ptr %gep
%y = add i64 %x, 1
store i64 %y, ptr %gep
%i.next = add i64 %i, 1
%done = icmp eq i64 %i.next, %tc.add
br i1 %done, label %exit, label %loop
exit:
ret void
}
;.
; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META2]], [[META1]]}
; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
; CHECK: [[LOOP5]] = distinct !{[[LOOP5]], [[META2]], [[META1]]}
; CHECK: [[LOOP6]] = distinct !{[[LOOP6]], [[META1]], [[META2]]}
; CHECK: [[LOOP7]] = distinct !{[[LOOP7]], [[META2]], [[META1]]}
;.
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