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[LV] InstCombine-simplify partial-reduce-sub dotp test #189739

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Merged
artagnon merged 1 commit into from
Apr 9, 2026
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[LV] InstCombine-simplify partial-reduce-sub dotp test #189739

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18 changes: 8 additions & 10 deletions llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-sub.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -27,13 +27,13 @@ define i32 @dotp(ptr %a, ptr %b) #0 {
; CHECK-INTERLEAVE1-NEXT: [[TMP4:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD1]] to <vscale x 16 x i32>
; CHECK-INTERLEAVE1-NEXT: [[TMP5:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD]] to <vscale x 16 x i32>
; CHECK-INTERLEAVE1-NEXT: [[TMP6:%.*]] = mul <vscale x 16 x i32> [[TMP4]], [[TMP5]]
; CHECK-INTERLEAVE1-NEXT: [[TMP11:%.*]] = sub <vscale x 16 x i32> zeroinitializer, [[TMP6]]
; CHECK-INTERLEAVE1-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP11]])
; CHECK-INTERLEAVE1-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP6]])
; CHECK-INTERLEAVE1-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; CHECK-INTERLEAVE1-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-INTERLEAVE1-NEXT: br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-INTERLEAVE1: middle.block:
; CHECK-INTERLEAVE1-NEXT: [[TMP9:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[PARTIAL_REDUCE]])
; CHECK-INTERLEAVE1-NEXT: [[TMP11:%.*]] = sub i32 0, [[TMP9]]
; 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:
Expand Down Expand Up @@ -64,19 +64,18 @@ define i32 @dotp(ptr %a, ptr %b) #0 {
; CHECK-INTERLEAVED-NEXT: [[TMP10:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD3]] to <vscale x 16 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP11:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD]] to <vscale x 16 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP12:%.*]] = mul <vscale x 16 x i32> [[TMP10]], [[TMP11]]
; CHECK-INTERLEAVED-NEXT: [[TMP13:%.*]] = sub <vscale x 16 x i32> zeroinitializer, [[TMP12]]
; CHECK-INTERLEAVED-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP13]])
; CHECK-INTERLEAVED-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP12]])
; CHECK-INTERLEAVED-NEXT: [[TMP21:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD4]] to <vscale x 16 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP15:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD2]] to <vscale x 16 x i32>
; CHECK-INTERLEAVED-NEXT: [[TMP16:%.*]] = mul <vscale x 16 x i32> [[TMP21]], [[TMP15]]
; CHECK-INTERLEAVED-NEXT: [[TMP17:%.*]] = sub <vscale x 16 x i32> zeroinitializer, [[TMP16]]
; CHECK-INTERLEAVED-NEXT: [[PARTIAL_REDUCE5]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI1]], <vscale x 16 x i32> [[TMP17]])
; CHECK-INTERLEAVED-NEXT: [[PARTIAL_REDUCE5]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI1]], <vscale x 16 x i32> [[TMP16]])
; CHECK-INTERLEAVED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; CHECK-INTERLEAVED-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-INTERLEAVED-NEXT: br i1 [[TMP18]], 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> [[PARTIAL_REDUCE5]], [[PARTIAL_REDUCE]]
; CHECK-INTERLEAVED-NEXT: [[TMP19:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[BIN_RDX]])
; CHECK-INTERLEAVED-NEXT: [[TMP17:%.*]] = sub i32 0, [[TMP19]]
; 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:
Expand All @@ -101,13 +100,13 @@ define i32 @dotp(ptr %a, ptr %b) #0 {
; CHECK-MAXBW-NEXT: [[TMP4:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD1]] to <vscale x 16 x i32>
; CHECK-MAXBW-NEXT: [[TMP5:%.*]] = zext <vscale x 16 x i8> [[WIDE_LOAD]] to <vscale x 16 x i32>
; CHECK-MAXBW-NEXT: [[TMP6:%.*]] = mul <vscale x 16 x i32> [[TMP4]], [[TMP5]]
; CHECK-MAXBW-NEXT: [[TMP8:%.*]] = sub <vscale x 16 x i32> zeroinitializer, [[TMP6]]
; CHECK-MAXBW-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP8]])
; CHECK-MAXBW-NEXT: [[PARTIAL_REDUCE]] = call <vscale x 4 x i32> @llvm.vector.partial.reduce.add.nxv4i32.nxv16i32(<vscale x 4 x i32> [[VEC_PHI]], <vscale x 16 x i32> [[TMP6]])
; 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: [[TMP9:%.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> [[PARTIAL_REDUCE]])
; CHECK-MAXBW-NEXT: [[TMP11:%.*]] = sub i32 0, [[TMP9]]
; 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:
Expand All @@ -125,8 +124,7 @@ for.body: ; preds = %for.body, %entry
%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
%add = sub i32 %accum, %mul
%iv.next = add i64 %iv, 1
%exitcond.not = icmp eq i64 %iv.next, 1024
br i1 %exitcond.not, label %for.exit, label %for.body
Expand Down
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