[llvm-branch-commits] [llvm] 643f8c2 - Revert "[LV] Handle chained selects/blends when creating new rdx chain. (#199…"
via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Sun May 24 16:38:30 PDT 2026
Author: Thurston Dang
Date: 2026-05-24T16:38:26-07:00
New Revision: 643f8c2ee196ac7f6d1c28f3ea2c6dd2f3a6cdc3
URL: https://github.com/llvm/llvm-project/commit/643f8c2ee196ac7f6d1c28f3ea2c6dd2f3a6cdc3
DIFF: https://github.com/llvm/llvm-project/commit/643f8c2ee196ac7f6d1c28f3ea2c6dd2f3a6cdc3.diff
LOG: Revert "[LV] Handle chained selects/blends when creating new rdx chain. (#199…"
This reverts commit 3f561eab147abf17c1838b4e3dc19837837a9740.
Added:
Modified:
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
Removed:
llvm/test/Transforms/LoopVectorize/select-cmp-blend-chain.ll
################################################################################
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index adb6de57f029d..40e3eaf319bde 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -7081,35 +7081,34 @@ void LoopVectorizationPlanner::addReductionResultComputation(
NewPhiR->insertBefore(PhiR);
VPValue *NewExiting = Builder.createOr(NewPhiR, Cmp);
- // The exiting value may flow through a chain of VPBlendRecipe and/or
- // VPInstruction::Select recipes before reaching OrigExitingVPV. Clone
- // each chain link in topological order so each clone refers to the
- // already-rewritten i1 operands via Substitutions.
+ // The exiting value may flow through a VPBlendRecipe and/or a wrapping
+ // VPInstruction::Select before reaching OrigExitingVPV. Clone each level
+ // of the chain with the i1 substitutions propagated through.
DenseMap<VPValue *, VPValue *> Substitutions = {{AnyOfSelect, NewExiting},
{PhiR, NewPhiR}};
- std::function<void(VPSingleDefRecipe *)> CloneChain =
- [&](VPSingleDefRecipe *Old) {
- if (Substitutions.contains(Old))
- return;
- SmallVector<VPValue *> NewOps;
- for (VPValue *Op : Old->operands()) {
- if (isa<VPBlendRecipe>(Op) ||
- match(Op, m_Select(m_VPValue(), m_VPValue(), m_VPValue())))
- CloneChain(cast<VPSingleDefRecipe>(Op));
- NewOps.push_back(Substitutions.lookup_or(Op, Op));
- }
- VPSingleDefRecipe *New;
- if (auto *B = dyn_cast<VPBlendRecipe>(Old))
- New = B->cloneWithOperands(NewOps);
- else
- New = cast<VPInstruction>(Old)->cloneWithOperands(NewOps);
- New->insertBefore(Old);
- Substitutions[Old] = New;
- };
+ auto CloneWithSubstitutions = [&](VPSingleDefRecipe *Old) {
+ SmallVector<VPValue *> NewOps;
+ for (VPValue *Op : Old->operands())
+ NewOps.push_back(Substitutions.lookup_or(Op, Op));
+ VPSingleDefRecipe *New;
+ if (auto *B = dyn_cast<VPBlendRecipe>(Old))
+ New = B->cloneWithOperands(NewOps);
+ else
+ New = cast<VPInstruction>(Old)->cloneWithOperands(NewOps);
+ New->insertBefore(Old);
+ NewExiting = New;
+ Substitutions[Old] = New;
+ };
+ // If there's an outer Select wrapping a Blend, clone the inner Blend
+ // first so the outer Select clone can refer to it.
if (OrigExitingVPV != AnyOfSelect) {
- CloneChain(cast<VPSingleDefRecipe>(OrigExitingVPV));
- NewExiting = Substitutions.lookup(OrigExitingVPV);
+ VPValue *Inner;
+ if (match(OrigExitingVPV,
+ m_Select(m_VPValue(), m_VPValue(Inner), m_VPValue())))
+ if (auto *InnerBlend = dyn_cast<VPBlendRecipe>(Inner))
+ CloneWithSubstitutions(InnerBlend);
+ CloneWithSubstitutions(cast<VPSingleDefRecipe>(OrigExitingVPV));
}
NewPhiR->setOperand(1, NewExiting);
PhiR->replaceAllUsesWith(
diff --git a/llvm/test/Transforms/LoopVectorize/select-cmp-blend-chain.ll b/llvm/test/Transforms/LoopVectorize/select-cmp-blend-chain.ll
deleted file mode 100644
index 7fa6b545df77c..0000000000000
--- a/llvm/test/Transforms/LoopVectorize/select-cmp-blend-chain.ll
+++ /dev/null
@@ -1,284 +0,0 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
-; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -S %s | FileCheck %s
-
-; Test case for https://github.com/llvm/llvm-project/issues/199406.
-define i32 @anyof_two_blend_chain(i1 %c0, i1 %c1, i32 %n) {
-; CHECK-LABEL: define i32 @anyof_two_blend_chain(
-; CHECK-SAME: i1 [[C0:%.*]], i1 [[C1:%.*]], i32 [[N:%.*]]) {
-; CHECK-NEXT: [[ENTRY:.*]]:
-; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[N]], i32 1)
-; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[SMAX]], 4
-; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
-; CHECK: [[VECTOR_PH]]:
-; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[SMAX]], 4
-; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[SMAX]], [[N_MOD_VF]]
-; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
-; CHECK: [[VECTOR_BODY]]:
-; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i1> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[PREDPHI1:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[TMP0:%.*]] = icmp eq <4 x i32> [[VEC_IND]], zeroinitializer
-; CHECK-NEXT: [[TMP1:%.*]] = or <4 x i1> [[VEC_PHI]], [[TMP0]]
-; CHECK-NEXT: [[PREDPHI:%.*]] = select i1 [[C1]], <4 x i1> [[VEC_PHI]], <4 x i1> [[TMP1]]
-; CHECK-NEXT: [[PREDPHI1]] = select i1 [[C0]], <4 x i1> [[VEC_PHI]], <4 x i1> [[PREDPHI]]
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
-; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
-; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[TMP2]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
-; CHECK: [[MIDDLE_BLOCK]]:
-; CHECK-NEXT: [[TMP3:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[PREDPHI1]])
-; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[SMAX]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
-; CHECK: [[SCALAR_PH]]:
-; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ 0, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
-; CHECK: [[LOOP_HEADER]]:
-; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
-; CHECK-NEXT: [[RDX:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[RDX_NEXT:%.*]], %[[LOOP_LATCH]] ]
-; CHECK-NEXT: br i1 [[C0]], label %[[LOOP_LATCH]], label %[[IF_OUTER:.*]]
-; CHECK: [[IF_OUTER]]:
-; CHECK-NEXT: br i1 [[C1]], label %[[IF_MERGE:.*]], label %[[IF_INNER:.*]]
-; CHECK: [[IF_INNER]]:
-; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], 0
-; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 0, i32 [[RDX]]
-; CHECK-NEXT: br label %[[IF_MERGE]]
-; CHECK: [[IF_MERGE]]:
-; CHECK-NEXT: [[BLEND1:%.*]] = phi i32 [ [[SEL]], %[[IF_INNER]] ], [ [[RDX]], %[[IF_OUTER]] ]
-; CHECK-NEXT: br label %[[LOOP_LATCH]]
-; CHECK: [[LOOP_LATCH]]:
-; CHECK-NEXT: [[RDX_NEXT]] = phi i32 [ [[BLEND1]], %[[IF_MERGE]] ], [ [[RDX]], %[[LOOP_HEADER]] ]
-; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
-; CHECK-NEXT: [[EC:%.*]] = icmp slt i32 [[IV_NEXT]], [[N]]
-; CHECK-NEXT: br i1 [[EC]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP3:![0-9]+]]
-; CHECK: [[EXIT]]:
-; CHECK-NEXT: [[RDX_NEXT_LCSSA:%.*]] = phi i32 [ [[RDX_NEXT]], %[[LOOP_LATCH]] ], [ 0, %[[MIDDLE_BLOCK]] ]
-; CHECK-NEXT: ret i32 [[RDX_NEXT_LCSSA]]
-;
-entry:
- br label %loop.header
-
-loop.header:
- %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
- %rdx = phi i32 [ 0, %entry ], [ %rdx.next, %loop.latch ]
- br i1 %c0, label %loop.latch, label %if.outer
-
-if.outer:
- br i1 %c1, label %if.merge, label %if.inner
-
-if.inner:
- %c = icmp eq i32 %iv, 0
- %sel = select i1 %c, i32 0, i32 %rdx
- br label %if.merge
-
-if.merge:
- %blend1 = phi i32 [ %sel, %if.inner ], [ %rdx, %if.outer ]
- br label %loop.latch
-
-loop.latch:
- %rdx.next = phi i32 [ %blend1, %if.merge ], [ %rdx, %loop.header ]
- %iv.next = add i32 %iv, 1
- %ec = icmp slt i32 %iv.next, %n
- br i1 %ec, label %loop.header, label %exit
-
-exit:
- ret i32 %rdx.next
-}
-
-define i32 @anyof_three_blend_chain(i1 %c0, i1 %c1, i1 %c2, i32 %n) {
-; CHECK-LABEL: define i32 @anyof_three_blend_chain(
-; CHECK-SAME: i1 [[C0:%.*]], i1 [[C1:%.*]], i1 [[C2:%.*]], i32 [[N:%.*]]) {
-; CHECK-NEXT: [[ENTRY:.*]]:
-; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[N]], i32 1)
-; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[SMAX]], 4
-; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
-; CHECK: [[VECTOR_PH]]:
-; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[SMAX]], 4
-; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[SMAX]], [[N_MOD_VF]]
-; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
-; CHECK: [[VECTOR_BODY]]:
-; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i1> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[PREDPHI2:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[TMP0:%.*]] = icmp eq <4 x i32> [[VEC_IND]], zeroinitializer
-; CHECK-NEXT: [[TMP1:%.*]] = or <4 x i1> [[VEC_PHI]], [[TMP0]]
-; CHECK-NEXT: [[PREDPHI:%.*]] = select i1 [[C2]], <4 x i1> [[VEC_PHI]], <4 x i1> [[TMP1]]
-; CHECK-NEXT: [[PREDPHI1:%.*]] = select i1 [[C1]], <4 x i1> [[VEC_PHI]], <4 x i1> [[PREDPHI]]
-; CHECK-NEXT: [[PREDPHI2]] = select i1 [[C0]], <4 x i1> [[VEC_PHI]], <4 x i1> [[PREDPHI1]]
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
-; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
-; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[TMP2]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
-; CHECK: [[MIDDLE_BLOCK]]:
-; CHECK-NEXT: [[TMP3:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[PREDPHI2]])
-; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[SMAX]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
-; CHECK: [[SCALAR_PH]]:
-; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ 0, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
-; CHECK: [[LOOP_HEADER]]:
-; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
-; CHECK-NEXT: [[RDX:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[RDX_NEXT:%.*]], %[[LOOP_LATCH]] ]
-; CHECK-NEXT: br i1 [[C0]], label %[[LOOP_LATCH]], label %[[IF1:.*]]
-; CHECK: [[IF1]]:
-; CHECK-NEXT: br i1 [[C1]], label %[[IF1_MERGE:.*]], label %[[IF2:.*]]
-; CHECK: [[IF2]]:
-; CHECK-NEXT: br i1 [[C2]], label %[[IF2_MERGE:.*]], label %[[IF3:.*]]
-; CHECK: [[IF3]]:
-; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], 0
-; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 0, i32 [[RDX]]
-; CHECK-NEXT: br label %[[IF2_MERGE]]
-; CHECK: [[IF2_MERGE]]:
-; CHECK-NEXT: [[BLEND1:%.*]] = phi i32 [ [[SEL]], %[[IF3]] ], [ [[RDX]], %[[IF2]] ]
-; CHECK-NEXT: br label %[[IF1_MERGE]]
-; CHECK: [[IF1_MERGE]]:
-; CHECK-NEXT: [[BLEND2:%.*]] = phi i32 [ [[BLEND1]], %[[IF2_MERGE]] ], [ [[RDX]], %[[IF1]] ]
-; CHECK-NEXT: br label %[[LOOP_LATCH]]
-; CHECK: [[LOOP_LATCH]]:
-; CHECK-NEXT: [[RDX_NEXT]] = phi i32 [ [[BLEND2]], %[[IF1_MERGE]] ], [ [[RDX]], %[[LOOP_HEADER]] ]
-; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
-; CHECK-NEXT: [[EC:%.*]] = icmp slt i32 [[IV_NEXT]], [[N]]
-; CHECK-NEXT: br i1 [[EC]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP5:![0-9]+]]
-; CHECK: [[EXIT]]:
-; CHECK-NEXT: [[RDX_NEXT_LCSSA:%.*]] = phi i32 [ [[RDX_NEXT]], %[[LOOP_LATCH]] ], [ 0, %[[MIDDLE_BLOCK]] ]
-; CHECK-NEXT: ret i32 [[RDX_NEXT_LCSSA]]
-;
-entry:
- br label %loop.header
-
-loop.header:
- %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
- %rdx = phi i32 [ 0, %entry ], [ %rdx.next, %loop.latch ]
- br i1 %c0, label %loop.latch, label %if1
-
-if1:
- br i1 %c1, label %if1.merge, label %if2
-
-if2:
- br i1 %c2, label %if2.merge, label %if3
-
-if3:
- %c = icmp eq i32 %iv, 0
- %sel = select i1 %c, i32 0, i32 %rdx
- br label %if2.merge
-
-if2.merge:
- %blend1 = phi i32 [ %sel, %if3 ], [ %rdx, %if2 ]
- br label %if1.merge
-
-if1.merge:
- %blend2 = phi i32 [ %blend1, %if2.merge ], [ %rdx, %if1 ]
- br label %loop.latch
-
-loop.latch:
- %rdx.next = phi i32 [ %blend2, %if1.merge ], [ %rdx, %loop.header ]
- %iv.next = add i32 %iv, 1
- %ec = icmp slt i32 %iv.next, %n
- br i1 %ec, label %loop.header, label %exit
-
-exit:
- ret i32 %rdx.next
-}
-
-define i32 @anyof_diamond_blend_chain(i1 %c0, i1 %c1, i32 %n) {
-; CHECK-LABEL: define i32 @anyof_diamond_blend_chain(
-; CHECK-SAME: i1 [[C0:%.*]], i1 [[C1:%.*]], i32 [[N:%.*]]) {
-; CHECK-NEXT: [[ENTRY:.*]]:
-; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[N]], i32 1)
-; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[SMAX]], 4
-; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
-; CHECK: [[VECTOR_PH]]:
-; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[SMAX]], 4
-; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[SMAX]], [[N_MOD_VF]]
-; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i1> poison, i1 [[C0]], i64 0
-; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i1> [[BROADCAST_SPLATINSERT]], <4 x i1> poison, <4 x i32> zeroinitializer
-; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <4 x i1> poison, i1 [[C1]], i64 0
-; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <4 x i1> [[BROADCAST_SPLATINSERT1]], <4 x i1> poison, <4 x i32> zeroinitializer
-; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
-; CHECK: [[VECTOR_BODY]]:
-; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i1> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[TMP0:%.*]] = icmp eq <4 x i32> [[VEC_IND]], zeroinitializer
-; CHECK-NEXT: [[TMP1:%.*]] = select <4 x i1> [[BROADCAST_SPLAT]], <4 x i1> [[TMP0]], <4 x i1> zeroinitializer
-; CHECK-NEXT: [[TMP2:%.*]] = select <4 x i1> [[BROADCAST_SPLAT2]], <4 x i1> [[TMP1]], <4 x i1> zeroinitializer
-; CHECK-NEXT: [[TMP3]] = or <4 x i1> [[VEC_PHI]], [[TMP2]]
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
-; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
-; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[TMP4]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
-; CHECK: [[MIDDLE_BLOCK]]:
-; CHECK-NEXT: [[TMP5:%.*]] = call i1 @llvm.vector.reduce.or.v4i1(<4 x i1> [[TMP3]])
-; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[SMAX]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
-; CHECK: [[SCALAR_PH]]:
-; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ 0, %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
-; CHECK: [[LOOP_HEADER]]:
-; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
-; CHECK-NEXT: [[RDX:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[RDX_NEXT:%.*]], %[[LOOP_LATCH]] ]
-; CHECK-NEXT: br i1 [[C0]], label %[[IF_TRUE:.*]], label %[[IF_FALSE:.*]]
-; CHECK: [[IF_TRUE]]:
-; CHECK-NEXT: [[C:%.*]] = icmp eq i32 [[IV]], 0
-; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 0, i32 [[RDX]]
-; CHECK-NEXT: br label %[[MERGE:.*]]
-; CHECK: [[IF_FALSE]]:
-; CHECK-NEXT: br label %[[MERGE]]
-; CHECK: [[MERGE]]:
-; CHECK-NEXT: [[BLEND:%.*]] = phi i32 [ [[SEL]], %[[IF_TRUE]] ], [ [[RDX]], %[[IF_FALSE]] ]
-; CHECK-NEXT: br i1 [[C1]], label %[[P1:.*]], label %[[P2:.*]]
-; CHECK: [[P1]]:
-; CHECK-NEXT: br label %[[FINAL_MERGE:.*]]
-; CHECK: [[P2]]:
-; CHECK-NEXT: br label %[[FINAL_MERGE]]
-; CHECK: [[FINAL_MERGE]]:
-; CHECK-NEXT: [[RDX_NEXT]] = phi i32 [ [[BLEND]], %[[P1]] ], [ [[RDX]], %[[P2]] ]
-; CHECK-NEXT: br label %[[LOOP_LATCH]]
-; CHECK: [[LOOP_LATCH]]:
-; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
-; CHECK-NEXT: [[EC:%.*]] = icmp slt i32 [[IV_NEXT]], [[N]]
-; CHECK-NEXT: br i1 [[EC]], label %[[LOOP_HEADER]], label %[[EXIT]], !llvm.loop [[LOOP7:![0-9]+]]
-; CHECK: [[EXIT]]:
-; CHECK-NEXT: [[RDX_NEXT_LCSSA:%.*]] = phi i32 [ [[RDX_NEXT]], %[[LOOP_LATCH]] ], [ 0, %[[MIDDLE_BLOCK]] ]
-; CHECK-NEXT: ret i32 [[RDX_NEXT_LCSSA]]
-;
-entry:
- br label %loop.header
-
-loop.header:
- %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
- %rdx = phi i32 [ 0, %entry ], [ %rdx.next, %loop.latch ]
- br i1 %c0, label %if.true, label %if.false
-
-if.true:
- %c = icmp eq i32 %iv, 0
- %sel = select i1 %c, i32 0, i32 %rdx
- br label %merge
-
-if.false:
- br label %merge
-
-merge:
- %blend = phi i32 [ %sel, %if.true ], [ %rdx, %if.false ]
- br i1 %c1, label %p1, label %p2
-
-p1:
- br label %final.merge
-
-p2:
- br label %final.merge
-
-final.merge:
- %rdx.next = phi i32 [ %blend, %p1 ], [ %rdx, %p2 ]
- br label %loop.latch
-
-loop.latch:
- %iv.next = add i32 %iv, 1
- %ec = icmp slt i32 %iv.next, %n
- br i1 %ec, label %loop.header, label %exit
-
-exit:
- ret i32 %rdx.next
-}
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