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llvm-project/llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-sub.ll
Florian Hahn 50b9ca4dda
[VPlan] Simplify Plan's entry in removeBranchOnConst. (#154510) 
After https://github.com/llvm/llvm-project/pull/153643, there may be a
BranchOnCond with constant condition in the entry block.

Simplify those in removeBranchOnConst. This removes a number of
redundant conditional branch from entry blocks.

In some cases, it may also make the original scalar loop unreachable,
because we know it will never execute. In that case, we need to remove
the loop from LoopInfo, because all unreachable blocks may dominate each
other, making LoopInfo invalid. In those cases, we can also completely
remove the loop, for which I'll share a follow-up patch.

Depends on https://github.com/llvm/llvm-project/pull/153643.

PR: https://github.com/llvm/llvm-project/pull/154510
2025-09-18 19:25:05 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "^scalar.ph:" --version 4
; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-INTERLEAVE1
; RUN: opt -passes=loop-vectorize -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-INTERLEAVED
; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -vectorizer-maximize-bandwidth -enable-epilogue-vectorization=false -S < %s | FileCheck %s --check-prefixes=CHECK-MAXBW
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-none-unknown-elf"
define i32 @dotp(ptr %a, ptr %b) #0 {
; CHECK-INTERLEAVE1-LABEL: define i32 @dotp(
; CHECK-INTERLEAVE1-SAME: ptr [[A:%.*]], ptr [[B:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-INTERLEAVE1-NEXT: entry:
; CHECK-INTERLEAVE1-NEXT: br label [[VECTOR_PH:%.*]]
; CHECK-INTERLEAVE1: vector.ph:
; CHECK-INTERLEAVE1-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-INTERLEAVE1-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 4
; CHECK-INTERLEAVE1-NEXT: [[N_MOD_VF:%.*]] = urem i64 1024, [[TMP3]]
; CHECK-INTERLEAVE1-NEXT: [[N_VEC:%.*]] = sub i64 1024, [[N_MOD_VF]]
; CHECK-INTERLEAVE1-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK-INTERLEAVE1: vector.body:
; CHECK-INTERLEAVE1-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-INTERLEAVE1-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP15:%.*]], [[VECTOR_BODY]] ]
; CHECK-INTERLEAVE1-NEXT: [[TMP7:%.*]] = getelementptr i8, ptr [[A]], i64 [[INDEX]]
; CHECK-INTERLEAVE1-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 4 x i8>, ptr [[TMP7]], align 1
; CHECK-INTERLEAVE1-NEXT: [[TMP9:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD]] to <vscale x 4 x i32>
; CHECK-INTERLEAVE1-NEXT: [[TMP10:%.*]] = getelementptr i8, ptr [[B]], i64 [[INDEX]]
; CHECK-INTERLEAVE1-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 4 x i8>, ptr [[TMP10]], align 1
; CHECK-INTERLEAVE1-NEXT: [[TMP12:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD1]] to <vscale x 4 x i32>
; CHECK-INTERLEAVE1-NEXT: [[TMP13:%.*]] = mul <vscale x 4 x i32> [[TMP12]], [[TMP9]]
; CHECK-INTERLEAVE1-NEXT: [[TMP14:%.*]] = sub <vscale x 4 x i32> zeroinitializer, [[TMP13]]
; CHECK-INTERLEAVE1-NEXT: [[TMP15]] = add <vscale x 4 x i32> [[VEC_PHI]], [[TMP14]]
; CHECK-INTERLEAVE1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP3]]
; CHECK-INTERLEAVE1-NEXT: [[TMP16:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-INTERLEAVE1-NEXT: br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-INTERLEAVE1: middle.block:
; CHECK-INTERLEAVE1-NEXT: [[TMP17:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[TMP15]])
; CHECK-INTERLEAVE1-NEXT: [[CMP_N:%.*]] = icmp eq i64 1024, [[N_VEC]]
; CHECK-INTERLEAVE1-NEXT: br i1 [[CMP_N]], label [[FOR_EXIT:%.*]], label [[SCALAR_PH:%.*]]
; CHECK-INTERLEAVE1: scalar.ph:
;
; CHECK-INTERLEAVED-LABEL: define i32 @dotp(
; CHECK-INTERLEAVED-SAME: ptr [[A:%.*]], ptr [[B:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-INTERLEAVED-NEXT: entry:
; CHECK-INTERLEAVED-NEXT: br label [[VECTOR_PH:%.*]]
; CHECK-INTERLEAVED: vector.ph:
; CHECK-INTERLEAVED-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-INTERLEAVED-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 8
; CHECK-INTERLEAVED-NEXT: [[N_MOD_VF:%.*]] = urem i64 1024, [[TMP3]]
; CHECK-INTERLEAVED-NEXT: [[N_VEC:%.*]] = sub i64 1024, [[N_MOD_VF]]
; CHECK-INTERLEAVED-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK-INTERLEAVED: vector.body:
; CHECK-INTERLEAVED-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-INTERLEAVED-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP25:%.*]], [[VECTOR_BODY]] ]
; CHECK-INTERLEAVED-NEXT: [[VEC_PHI1:%.*]] = phi <vscale x 4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[TMP26:%.*]], [[VECTOR_BODY]] ]
; CHECK-INTERLEAVED-NEXT: [[TMP7:%.*]] = getelementptr i8, ptr [[A]], i64 [[INDEX]]
; CHECK-INTERLEAVED-NEXT: [[TMP9:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-INTERLEAVED-NEXT: [[TMP10:%.*]] = shl nuw i64 [[TMP9]], 2
; CHECK-INTERLEAVED-NEXT: [[TMP11:%.*]] = getelementptr i8, ptr [[TMP7]], i64 [[TMP10]]
; CHECK-INTERLEAVED-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 4 x i8>, ptr [[TMP7]], align 1
; CHECK-INTERLEAVED-NEXT: [[WIDE_LOAD2:%.*]] = load <vscale x 4 x i8>, ptr [[TMP11]], align 1
; CHECK-INTERLEAVED-NEXT: [[TMP12:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD]] to <vscale x 4 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP13:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD2]] to <vscale x 4 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[B]], i64 [[INDEX]]
; CHECK-INTERLEAVED-NEXT: [[TMP16:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-INTERLEAVED-NEXT: [[TMP17:%.*]] = shl nuw i64 [[TMP16]], 2
; CHECK-INTERLEAVED-NEXT: [[TMP18:%.*]] = getelementptr i8, ptr [[TMP14]], i64 [[TMP17]]
; CHECK-INTERLEAVED-NEXT: [[WIDE_LOAD3:%.*]] = load <vscale x 4 x i8>, ptr [[TMP14]], align 1
; CHECK-INTERLEAVED-NEXT: [[WIDE_LOAD4:%.*]] = load <vscale x 4 x i8>, ptr [[TMP18]], align 1
; CHECK-INTERLEAVED-NEXT: [[TMP19:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD3]] to <vscale x 4 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP20:%.*]] = zext <vscale x 4 x i8> [[WIDE_LOAD4]] to <vscale x 4 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP21:%.*]] = mul <vscale x 4 x i32> [[TMP19]], [[TMP12]]
; CHECK-INTERLEAVED-NEXT: [[TMP22:%.*]] = mul <vscale x 4 x i32> [[TMP20]], [[TMP13]]
; CHECK-INTERLEAVED-NEXT: [[TMP23:%.*]] = sub <vscale x 4 x i32> zeroinitializer, [[TMP21]]
; CHECK-INTERLEAVED-NEXT: [[TMP24:%.*]] = sub <vscale x 4 x i32> zeroinitializer, [[TMP22]]
; CHECK-INTERLEAVED-NEXT: [[TMP25]] = add <vscale x 4 x i32> [[VEC_PHI]], [[TMP23]]
; CHECK-INTERLEAVED-NEXT: [[TMP26]] = add <vscale x 4 x i32> [[VEC_PHI1]], [[TMP24]]
; CHECK-INTERLEAVED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP3]]
; CHECK-INTERLEAVED-NEXT: [[TMP27:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-INTERLEAVED-NEXT: br i1 [[TMP27]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-INTERLEAVED: middle.block:
; CHECK-INTERLEAVED-NEXT: [[BIN_RDX:%.*]] = add <vscale x 4 x i32> [[TMP26]], [[TMP25]]
; CHECK-INTERLEAVED-NEXT: [[TMP28:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[BIN_RDX]])
; CHECK-INTERLEAVED-NEXT: [[CMP_N:%.*]] = icmp eq i64 1024, [[N_VEC]]
; CHECK-INTERLEAVED-NEXT: br i1 [[CMP_N]], label [[FOR_EXIT:%.*]], label [[SCALAR_PH:%.*]]
; CHECK-INTERLEAVED: scalar.ph:
;
; CHECK-MAXBW-LABEL: define i32 @dotp(
; CHECK-MAXBW-SAME: ptr [[A:%.*]], ptr [[B:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-MAXBW-NEXT: entry:
; CHECK-MAXBW-NEXT: br label [[ENTRY:%.*]]
; CHECK-MAXBW: vector.ph:
; CHECK-MAXBW-NEXT: [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; CHECK-MAXBW-NEXT: [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 8
; CHECK-MAXBW-NEXT: [[N_MOD_VF:%.*]] = urem i64 1024, [[TMP3]]
; CHECK-MAXBW-NEXT: [[N_VEC:%.*]] = sub i64 1024, [[N_MOD_VF]]
; CHECK-MAXBW-NEXT: br label [[FOR_BODY:%.*]]
; CHECK-MAXBW: vector.body:
; CHECK-MAXBW-NEXT: [[IV:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-MAXBW-NEXT: [[VEC_PHI:%.*]] = phi <vscale x 2 x i32> [ zeroinitializer, [[ENTRY]] ], [ [[PARTIAL_REDUCE:%.*]], [[FOR_BODY]] ]
; CHECK-MAXBW-NEXT: [[TMP7:%.*]] = getelementptr i8, ptr [[A]], i64 [[IV]]
; CHECK-MAXBW-NEXT: [[WIDE_LOAD:%.*]] = load <vscale x 8 x i8>, ptr [[TMP7]], align 1
; CHECK-MAXBW-NEXT: [[TMP9:%.*]] = zext <vscale x 8 x i8> [[WIDE_LOAD]] to <vscale x 8 x i32>
; CHECK-MAXBW-NEXT: [[TMP10:%.*]] = getelementptr i8, ptr [[B]], i64 [[IV]]
; CHECK-MAXBW-NEXT: [[WIDE_LOAD1:%.*]] = load <vscale x 8 x i8>, ptr [[TMP10]], align 1
; CHECK-MAXBW-NEXT: [[TMP12:%.*]] = zext <vscale x 8 x i8> [[WIDE_LOAD1]] to <vscale x 8 x i32>
; CHECK-MAXBW-NEXT: [[TMP13:%.*]] = mul <vscale x 8 x i32> [[TMP12]], [[TMP9]]
; CHECK-MAXBW-NEXT: [[TMP14:%.*]] = sub <vscale x 8 x i32> zeroinitializer, [[TMP13]]
; CHECK-MAXBW-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 2 x i32> @llvm.vector.partial.reduce.add.nxv2i32.nxv8i32(<vscale x 2 x i32> [[VEC_PHI]], <vscale x 8 x i32> [[TMP14]])
; CHECK-MAXBW-NEXT: [[IV_NEXT]] = add nuw i64 [[IV]], [[TMP3]]
; CHECK-MAXBW-NEXT: [[TMP16:%.*]] = icmp eq i64 [[IV_NEXT]], [[N_VEC]]
; CHECK-MAXBW-NEXT: br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[FOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-MAXBW: middle.block:
; CHECK-MAXBW-NEXT: [[TMP17:%.*]] = call i32 @llvm.vector.reduce.add.nxv2i32(<vscale x 2 x i32> [[PARTIAL_REDUCE]])
; CHECK-MAXBW-NEXT: [[CMP_N:%.*]] = icmp eq i64 1024, [[N_VEC]]
; CHECK-MAXBW-NEXT: br i1 [[CMP_N]], label [[FOR_EXIT:%.*]], label [[SCALAR_PH:%.*]]
; CHECK-MAXBW: scalar.ph:
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
%accum = phi i32 [ 0, %entry ], [ %add, %for.body ]
%gep.a = getelementptr i8, ptr %a, i64 %iv
%load.a = load i8, ptr %gep.a, align 1
%ext.a = zext i8 %load.a to i32
%gep.b = getelementptr i8, ptr %b, i64 %iv
%load.b = load i8, ptr %gep.b, align 1
%ext.b = zext i8 %load.b to i32
%mul = mul i32 %ext.b, %ext.a
%sub = sub i32 0, %mul
%add = add i32 %accum, %sub
%iv.next = add i64 %iv, 1
%exitcond.not = icmp eq i64 %iv.next, 1024
br i1 %exitcond.not, label %for.exit, label %for.body
for.exit: ; preds = %for.body
ret i32 %add
}
!7 = distinct !{!7, !8, !9, !10}
!8 = !{!"llvm.loop.mustprogress"}
!9 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
!10 = !{!"llvm.loop.vectorize.enable", i1 true}
attributes #0 = { vscale_range(1,16) "target-features"="+sve" }
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