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Merged
merged 8 commits into from
Aug 8, 2025
Merged

[RISCV] Enable tail folding by default #151681

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5edb5fc
[RISCV] Enable tail folding by default
lukel97 Aug 1, 2025
481c067
Merge branch 'main' of github.com:llvm/llvm-project into riscv/enable…
lukel97 Aug 6, 2025
85a7812
Merge branch 'main' of github.com:llvm/llvm-project into riscv/enable…
lukel97 Aug 7, 2025
6ed2e44
Merge branch 'main' of github.com:llvm/llvm-project into riscv/enable…
lukel97 Aug 7, 2025
08c11f6
Test interleave costs with tail folding
lukel97 Aug 7, 2025
94ed80d
Merge branch 'main' of github.com:llvm/llvm-project into riscv/enable…
lukel97 Aug 8, 2025
488e3c1
Merge branch 'main' of github.com:llvm/llvm-project into riscv/enable…
lukel97 Aug 8, 2025
c1abf58
Merge branch 'main' into riscv/enable-tail-folding
lukel97 Aug 8, 2025
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3 changes: 3 additions & 0 deletions llvm/lib/Target/RISCV/RISCVTargetTransformInfo.h
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Expand Up @@ -114,6 +114,9 @@ class RISCVTTIImpl final : public BasicTTIImplBase<RISCVTTIImpl> {
bool enableScalableVectorization() const override {
return ST->hasVInstructions();
}
bool preferPredicateOverEpilogue(TailFoldingInfo *TFI) const override {
return ST->hasVInstructions();
}
TailFoldingStyle
getPreferredTailFoldingStyle(bool IVUpdateMayOverflow) const override {
return ST->hasVInstructions() ? TailFoldingStyle::DataWithEVL
Expand Down
80 changes: 42 additions & 38 deletions llvm/test/Transforms/LoopVectorize/RISCV/bf16.ll
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@@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S | FileCheck %s -check-prefix=NO-ZVFBFMIN
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue | FileCheck %s -check-prefix=NO-ZVFBFMIN
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S -prefer-predicate-over-epilogue=scalar-epilogue | FileCheck %s -check-prefix=NO-ZVFBFMIN
; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v,+zvfbfmin -S | FileCheck %s -check-prefix=ZVFBFMIN

define void @fadd(ptr noalias %a, ptr noalias %b, i64 %n) {
Expand All @@ -25,37 +25,39 @@ define void @fadd(ptr noalias %a, ptr noalias %b, i64 %n) {
; ZVFBFMIN-LABEL: define void @fadd(
; ZVFBFMIN-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
; ZVFBFMIN-NEXT: [[ENTRY:.*]]:
; ZVFBFMIN-NEXT: [[TMP7:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP8:%.*]] = mul nuw i64 [[TMP7]], 8
; ZVFBFMIN-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], [[TMP8]]
; ZVFBFMIN-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; ZVFBFMIN-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; ZVFBFMIN: [[VECTOR_PH]]:
; ZVFBFMIN-NEXT: [[TMP9:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP10:%.*]] = mul nuw i64 [[TMP9]], 8
; ZVFBFMIN-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP10]]
; ZVFBFMIN-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; ZVFBFMIN-NEXT: [[TMP3:%.*]] = sub i64 [[TMP10]], 1
; ZVFBFMIN-NEXT: [[N_RND_UP:%.*]] = add i64 [[N]], [[TMP3]]
; ZVFBFMIN-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP10]]
; ZVFBFMIN-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; ZVFBFMIN-NEXT: [[TMP12:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP5:%.*]] = mul nuw i64 [[TMP12]], 8
; ZVFBFMIN-NEXT: br label %[[VECTOR_BODY:.*]]
; ZVFBFMIN: [[VECTOR_BODY]]:
; ZVFBFMIN-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[TMP0:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[AVL:%.*]] = phi i64 [ [[N]], %[[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[TMP6:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 8, i1 true)
; ZVFBFMIN-NEXT: [[TMP1:%.*]] = getelementptr bfloat, ptr [[A]], i64 [[TMP0]]
; ZVFBFMIN-NEXT: [[TMP2:%.*]] = getelementptr bfloat, ptr [[B]], i64 [[TMP0]]
; ZVFBFMIN-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 8 x bfloat>, ptr [[TMP1]], align 2
; ZVFBFMIN-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 8 x bfloat>, ptr [[TMP2]], align 2
; ZVFBFMIN-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 8 x bfloat> @llvm.vp.load.nxv8bf16.p0(ptr align 2 [[TMP1]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
; ZVFBFMIN-NEXT: [[WIDE_LOAD1:%.*]] = call <vscale x 8 x bfloat> @llvm.vp.load.nxv8bf16.p0(ptr align 2 [[TMP2]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
; ZVFBFMIN-NEXT: [[TMP11:%.*]] = fadd <vscale x 8 x bfloat> [[WIDE_LOAD]], [[WIDE_LOAD1]]
; ZVFBFMIN-NEXT: store <vscale x 8 x bfloat> [[TMP11]], ptr [[TMP1]], align 2
; ZVFBFMIN-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP0]], [[TMP5]]
; ZVFBFMIN-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; ZVFBFMIN-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; ZVFBFMIN-NEXT: call void @llvm.vp.store.nxv8bf16.p0(<vscale x 8 x bfloat> [[TMP11]], ptr align 2 [[TMP1]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
; ZVFBFMIN-NEXT: [[TMP13:%.*]] = zext i32 [[TMP6]] to i64
; ZVFBFMIN-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP13]], [[TMP0]]
; ZVFBFMIN-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP13]]
; ZVFBFMIN-NEXT: [[TMP14:%.*]] = icmp eq i64 [[INDEX_EVL_NEXT]], [[N]]
; ZVFBFMIN-NEXT: br i1 [[TMP14]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; ZVFBFMIN: [[MIDDLE_BLOCK]]:
; ZVFBFMIN-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; ZVFBFMIN-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
; ZVFBFMIN-NEXT: br label %[[EXIT:.*]]
; ZVFBFMIN: [[SCALAR_PH]]:
; ZVFBFMIN-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; ZVFBFMIN-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; ZVFBFMIN-NEXT: br label %[[LOOP:.*]]
; ZVFBFMIN: [[LOOP]]:
; ZVFBFMIN-NEXT: [[I:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; ZVFBFMIN-NEXT: [[I:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; ZVFBFMIN-NEXT: [[A_GEP:%.*]] = getelementptr bfloat, ptr [[A]], i64 [[I]]
; ZVFBFMIN-NEXT: [[B_GEP:%.*]] = getelementptr bfloat, ptr [[B]], i64 [[I]]
; ZVFBFMIN-NEXT: [[X:%.*]] = load bfloat, ptr [[A_GEP]], align 2
Expand All @@ -64,7 +66,7 @@ define void @fadd(ptr noalias %a, ptr noalias %b, i64 %n) {
; ZVFBFMIN-NEXT: store bfloat [[Z]], ptr [[A_GEP]], align 2
; ZVFBFMIN-NEXT: [[I_NEXT]] = add i64 [[I]], 1
; ZVFBFMIN-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[N]]
; ZVFBFMIN-NEXT: br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
; ZVFBFMIN-NEXT: br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP4:![0-9]+]]
; ZVFBFMIN: [[EXIT]]:
; ZVFBFMIN-NEXT: ret void
;
Expand Down Expand Up @@ -137,41 +139,43 @@ define void @vfwmaccbf16.vv(ptr noalias %a, ptr noalias %b, ptr noalias %c, i64
; ZVFBFMIN-LABEL: define void @vfwmaccbf16.vv(
; ZVFBFMIN-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], ptr noalias [[C:%.*]], i64 [[N:%.*]]) #[[ATTR0]] {
; ZVFBFMIN-NEXT: [[ENTRY:.*]]:
; ZVFBFMIN-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP1:%.*]] = mul nuw i64 [[TMP0]], 4
; ZVFBFMIN-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], [[TMP1]]
; ZVFBFMIN-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; ZVFBFMIN-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; ZVFBFMIN: [[VECTOR_PH]]:
; ZVFBFMIN-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 4
; ZVFBFMIN-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP3]]
; ZVFBFMIN-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; ZVFBFMIN-NEXT: [[TMP10:%.*]] = sub i64 [[TMP3]], 1
; ZVFBFMIN-NEXT: [[N_RND_UP:%.*]] = add i64 [[N]], [[TMP10]]
; ZVFBFMIN-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], [[TMP3]]
; ZVFBFMIN-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; ZVFBFMIN-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; ZVFBFMIN-NEXT: [[TMP5:%.*]] = mul nuw i64 [[TMP4]], 4
; ZVFBFMIN-NEXT: br label %[[VECTOR_BODY:.*]]
; ZVFBFMIN: [[VECTOR_BODY]]:
; ZVFBFMIN-NEXT: [[TMP6:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[TMP6:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[AVL:%.*]] = phi i64 [ [[N]], %[[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
; ZVFBFMIN-NEXT: [[TMP11:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 4, i1 true)
; ZVFBFMIN-NEXT: [[TMP7:%.*]] = getelementptr bfloat, ptr [[A]], i64 [[TMP6]]
; ZVFBFMIN-NEXT: [[TMP8:%.*]] = getelementptr bfloat, ptr [[B]], i64 [[TMP6]]
; ZVFBFMIN-NEXT: [[TMP9:%.*]] = getelementptr float, ptr [[C]], i64 [[TMP6]]
; ZVFBFMIN-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 4 x bfloat>, ptr [[TMP7]], align 2
; ZVFBFMIN-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 4 x bfloat>, ptr [[TMP8]], align 2
; ZVFBFMIN-NEXT: [[WIDE_LOAD2:%.*]] = load <vscale x 4 x float>, ptr [[TMP9]], align 4
; ZVFBFMIN-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 4 x bfloat> @llvm.vp.load.nxv4bf16.p0(ptr align 2 [[TMP7]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; ZVFBFMIN-NEXT: [[WIDE_LOAD1:%.*]] = call <vscale x 4 x bfloat> @llvm.vp.load.nxv4bf16.p0(ptr align 2 [[TMP8]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; ZVFBFMIN-NEXT: [[WIDE_LOAD2:%.*]] = call <vscale x 4 x float> @llvm.vp.load.nxv4f32.p0(ptr align 4 [[TMP9]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; ZVFBFMIN-NEXT: [[TMP13:%.*]] = fpext <vscale x 4 x bfloat> [[WIDE_LOAD]] to <vscale x 4 x float>
; ZVFBFMIN-NEXT: [[TMP14:%.*]] = fpext <vscale x 4 x bfloat> [[WIDE_LOAD1]] to <vscale x 4 x float>
; ZVFBFMIN-NEXT: [[TMP15:%.*]] = call <vscale x 4 x float> @llvm.fmuladd.nxv4f32(<vscale x 4 x float> [[TMP13]], <vscale x 4 x float> [[TMP14]], <vscale x 4 x float> [[WIDE_LOAD2]])
; ZVFBFMIN-NEXT: store <vscale x 4 x float> [[TMP15]], ptr [[TMP9]], align 4
; ZVFBFMIN-NEXT: [[INDEX_NEXT]] = add nuw i64 [[TMP6]], [[TMP5]]
; ZVFBFMIN-NEXT: [[TMP16:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; ZVFBFMIN-NEXT: br i1 [[TMP16]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; ZVFBFMIN-NEXT: call void @llvm.vp.store.nxv4f32.p0(<vscale x 4 x float> [[TMP15]], ptr align 4 [[TMP9]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP11]])
; ZVFBFMIN-NEXT: [[TMP12:%.*]] = zext i32 [[TMP11]] to i64
; ZVFBFMIN-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP12]], [[TMP6]]
; ZVFBFMIN-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP12]]
; ZVFBFMIN-NEXT: [[TMP16:%.*]] = icmp eq i64 [[INDEX_EVL_NEXT]], [[N]]
; ZVFBFMIN-NEXT: br i1 [[TMP16]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; ZVFBFMIN: [[MIDDLE_BLOCK]]:
; ZVFBFMIN-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; ZVFBFMIN-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
; ZVFBFMIN-NEXT: br label %[[EXIT:.*]]
; ZVFBFMIN: [[SCALAR_PH]]:
; ZVFBFMIN-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; ZVFBFMIN-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ]
; ZVFBFMIN-NEXT: br label %[[LOOP:.*]]
; ZVFBFMIN: [[LOOP]]:
; ZVFBFMIN-NEXT: [[I:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; ZVFBFMIN-NEXT: [[I:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; ZVFBFMIN-NEXT: [[A_GEP:%.*]] = getelementptr bfloat, ptr [[A]], i64 [[I]]
; ZVFBFMIN-NEXT: [[B_GEP:%.*]] = getelementptr bfloat, ptr [[B]], i64 [[I]]
; ZVFBFMIN-NEXT: [[C_GEP:%.*]] = getelementptr float, ptr [[C]], i64 [[I]]
Expand All @@ -184,7 +188,7 @@ define void @vfwmaccbf16.vv(ptr noalias %a, ptr noalias %b, ptr noalias %c, i64
; ZVFBFMIN-NEXT: store float [[FMULADD]], ptr [[C_GEP]], align 4
; ZVFBFMIN-NEXT: [[I_NEXT]] = add i64 [[I]], 1
; ZVFBFMIN-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[N]]
; ZVFBFMIN-NEXT: br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP5:![0-9]+]]
; ZVFBFMIN-NEXT: br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP6:![0-9]+]]
; ZVFBFMIN: [[EXIT]]:
; ZVFBFMIN-NEXT: ret void
;
Expand Down
54 changes: 4 additions & 50 deletions llvm/test/Transforms/LoopVectorize/RISCV/blend-any-of-reduction-cost.ll
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Expand Up @@ -62,50 +62,10 @@ define i32 @any_of_reduction_used_in_blend_with_multiple_phis(ptr %src, i64 %N,
; CHECK-LABEL: define i32 @any_of_reduction_used_in_blend_with_multiple_phis(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]], i1 [[C_0:%.*]], i1 [[C_1:%.*]]) #[[ATTR0]] {
; CHECK-NEXT: [[ENTRY:.*]]:
; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP1:%.*]] = mul nuw i64 [[TMP0]], 2
; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], [[TMP1]]
; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 2
; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N]], [[TMP3]]
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; CHECK-NEXT: [[TMP4:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-NEXT: [[TMP5:%.*]] = mul nuw i64 [[TMP4]], 2
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 2 x i1> poison, i1 [[C_1]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 2 x i1> [[BROADCAST_SPLATINSERT1]], <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 2 x i1> poison, i1 [[C_0]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 2 x i1> [[BROADCAST_SPLATINSERT]], <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP6:%.*]] = xor <vscale x 2 x i1> [[BROADCAST_SPLAT]], splat (i1 true)
; CHECK-NEXT: [[TMP7:%.*]] = xor <vscale x 2 x i1> [[BROADCAST_SPLAT2]], splat (i1 true)
; CHECK-NEXT: [[TMP8:%.*]] = select <vscale x 2 x i1> [[TMP6]], <vscale x 2 x i1> [[TMP7]], <vscale x 2 x i1> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 2 x ptr> poison, ptr [[SRC]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 2 x ptr> [[BROADCAST_SPLATINSERT3]], <vscale x 2 x ptr> poison, <vscale x 2 x i32> zeroinitializer
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 2 x i1> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[PREDPHI:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[WIDE_MASKED_GATHER:%.*]] = call <vscale x 2 x ptr> @llvm.masked.gather.nxv2p0.nxv2p0(<vscale x 2 x ptr> [[BROADCAST_SPLAT4]], i32 8, <vscale x 2 x i1> [[TMP8]], <vscale x 2 x ptr> poison)
; CHECK-NEXT: [[TMP9:%.*]] = icmp eq <vscale x 2 x ptr> [[WIDE_MASKED_GATHER]], zeroinitializer
; CHECK-NEXT: [[TMP10:%.*]] = or <vscale x 2 x i1> [[VEC_PHI]], [[TMP9]]
; CHECK-NEXT: [[PREDPHI]] = select <vscale x 2 x i1> [[TMP8]], <vscale x 2 x i1> [[TMP10]], <vscale x 2 x i1> [[VEC_PHI]]
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP5]]
; CHECK-NEXT: [[TMP11:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP11]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: [[MIDDLE_BLOCK]]:
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Cost model caused?

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Yeah, I've included a note about this in the PR description

; CHECK-NEXT: [[TMP12:%.*]] = call i1 @llvm.vector.reduce.or.nxv2i1(<vscale x 2 x i1> [[PREDPHI]])
; CHECK-NEXT: [[TMP13:%.*]] = freeze i1 [[TMP12]]
; CHECK-NEXT: [[RDX_SELECT:%.*]] = select i1 [[TMP13]], i32 0, i32 0
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK: [[SCALAR_PH]]:
; CHECK-NEXT: [[BC_MERGE_RDX:%.*]] = phi i32 [ [[RDX_SELECT]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT: br label %[[LOOP_HEADER:.*]]
; CHECK: [[LOOP_HEADER]]:
; CHECK-NEXT: [[ANY_OF_RED:%.*]] = phi i32 [ [[BC_MERGE_RDX]], %[[SCALAR_PH]] ], [ [[ANY_OF_RED_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH]] ]
; CHECK-NEXT: [[ANY_OF_RED:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[ANY_OF_RED_NEXT:%.*]], %[[LOOP_LATCH:.*]] ]
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP_LATCH]] ]
; CHECK-NEXT: br i1 [[C_0]], label %[[X_1:.*]], label %[[ELSE_1:.*]]
; CHECK: [[ELSE_1]]:
; CHECK-NEXT: br i1 [[C_1]], label %[[X_1]], label %[[ELSE_2:.*]]
Expand All @@ -121,9 +81,9 @@ define i32 @any_of_reduction_used_in_blend_with_multiple_phis(ptr %src, i64 %N,
; CHECK-NEXT: [[ANY_OF_RED_NEXT]] = phi i32 [ [[P]], %[[X_1]] ], [ [[SEL]], %[[ELSE_2]] ]
; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK-NEXT: br i1 [[EC]], label %[[EXIT:.*]], label %[[LOOP_HEADER]]
; CHECK: [[EXIT]]:
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[ANY_OF_RED_NEXT]], %[[LOOP_LATCH]] ], [ [[RDX_SELECT]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT: [[RES:%.*]] = phi i32 [ [[ANY_OF_RED_NEXT]], %[[LOOP_LATCH]] ]
; CHECK-NEXT: ret i32 [[RES]]
;
entry:
Expand Down Expand Up @@ -159,9 +119,3 @@ exit:
}

attributes #0 = { "target-cpu"="sifive-p670" }
;.
; 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]]}
;.
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