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[GISel][CombinerHelper] Shuffle pattern for reversing vector order
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@ValentijnvdBeek
ValentijnvdBeek committed Jun 25, 2024
1 parent bd02f92 commit 73a92c2
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44 changes: 44 additions & 0 deletions llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -494,6 +494,50 @@ bool CombinerHelper::tryCombineShuffleVector(MachineInstr &MI) {
return true;
}

// {n/2, n/2+1, ..., n, 0, 1, ..., n/2-1}
GeneratorType FirstHalf = adderGenerator(0, SrcNumElts / 2, 1);
GeneratorType SecondHalf = adderGenerator(SrcNumElts / 2, SrcNumElts, 1);
GeneratorType Reverse =
concatGenerators(SmallVector<GeneratorType>{FirstHalf, SecondHalf});

if (matchCombineShuffleVector(MI, Reverse, SrcNumElts)) {
// The shuffle is concatenating multiple vectors together.
// Collect the different operands for that.
Register UndefReg;
const Register Src1 = MI.getOperand(1).getReg();
const Register Src2 = MI.getOperand(2).getReg();
const ArrayRef<int> Mask = MI.getOperand(3).getShuffleMask();

// The destination can be longer than the source, so we separate them into
// equal blocks and check them separately to see if one of the blocks can be
// copied whole.
unsigned NumConcat = DstNumElts / SrcNumElts;
unsigned Index = 0;
for (unsigned Concat = 0; Concat < NumConcat; Concat++) {
unsigned Target = (Concat + 1) * SrcNumElts;
while (Index < Target) {
int MaskElt = Mask[Index];
if (MaskElt >= 0) {
Ops.push_back((MaskElt < (int)SrcNumElts) ? Src1 : Src2);
break;
}
Index++;
}

if (Index == Target) {
if (!UndefReg) {
Builder.setInsertPt(*MI.getParent(), MI);
UndefReg = Builder.buildUndef(SrcTy).getReg(0);
}
Ops.push_back(UndefReg);
}

Index = Target;
}
applyCombineShuffleVector(MI, {Ops[1], Ops[0]});
return true;
}

return false;
}

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168 changes: 168 additions & 0 deletions llvm/test/CodeGen/AIE/aie2/GlobalISel/prelegalizercombiner-shufflevector.mir
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Original file line number Diff line number Diff line change
Expand Up @@ -474,3 +474,171 @@ body: |
%2:_(<128 x s8>) = COPY $y3
%3:_(<128 x s8>) = G_SHUFFLE_VECTOR %1:_(<128 x s8>), %2:_(<128 x s8>), shufflemask(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191)
PseudoRET implicit $lr, implicit %3
...

---
name: concat_vector_reverse_32_512
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_undef_start_first
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_undef_start_first
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(-1, -1, -1, -1, 12, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_start_end
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_start_end
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, 10, 11, 12, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_end_start
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_end_start
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, 4, 5, 6, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_end_end
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_end_end
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 3, -1, -1, -1, -1)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_first_block
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_first_block
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[DEF:%[0-9]+]]:_(<8 x s32>) = G_IMPLICIT_DEF
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[DEF]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(-1, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_second_block
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_second_block
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[DEF:%[0-9]+]]:_(<8 x s32>) = G_IMPLICIT_DEF
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY]](<8 x s32>), [[DEF]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0
...

---
name: concat_vector_reverse_32_512_random
legalized: false
body: |
bb.1.entry:
liveins: $wl2, $wl4
; CHECK-LABEL: name: concat_vector_reverse_32_512_random
; CHECK: liveins: $wl2, $wl4
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:_(<8 x s32>) = COPY $wl2
; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<8 x s32>) = COPY $wl4
; CHECK-NEXT: [[CONCAT_VECTORS:%[0-9]+]]:_(<16 x s32>) = G_CONCAT_VECTORS [[COPY1]](<8 x s32>), [[COPY]](<8 x s32>)
; CHECK-NEXT: $x0 = COPY [[CONCAT_VECTORS]](<16 x s32>)
; CHECK-NEXT: PseudoRET implicit $lr, implicit $x0
%1:_(<8 x s32>) = COPY $wl2
%2:_(<8 x s32>) = COPY $wl4
%0:_(<16 x s32>) = G_SHUFFLE_VECTOR %1:_(<8 x s32>), %2:_, shufflemask(8, 9, -1, 11, 12, 13, -1, 15, 0, 1, -1, 3, 4, 5, -1, 7)
$x0 = COPY %0:_(<16 x s32>)
PseudoRET implicit $lr, implicit $x0

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