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[a64] Implement `PERMUTE_V128`(int16) 

Passes 'vmrghh' and `vmrglh` unit-tests
This commit is contained in:
Wunkolo 2024-05-12 19:04:58 -07:00
parent 7eca228027
commit 684904c487
1 changed files with 56 additions and 1 deletions
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57
src/xenia/cpu/backend/a64/a64_seq_vector.cc
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@ -1166,7 +1166,62 @@ struct PERMUTE_V128
indices.B16());
}
static void EmitByInt16(A64Emitter& e, const EmitArgType& i) {}
static void EmitByInt16(A64Emitter& e, const EmitArgType& i) {
// Permute bytes between src2 and src3.
// src1 is an array of indices corresponding to positions within src2 and
// src3.
if (i.src3.value->IsConstantZero()) {
if (i.src2.value->IsConstantZero()) {
// src2 & src3 are zero, so result will always be zero.
e.EOR(i.dest.reg().B16(), i.dest.reg().B16(), i.dest.reg().B16());
return;
}
}
const QReg indices = Q0;
if (i.src1.is_constant) {
e.LoadConstantV(indices, i.src1.constant());
} else {
e.MOV(indices.B16(), i.src1.reg().B16());
}
// Indices must be endian-swapped
e.MOV(W0, 0b1);
e.DUP(Q1.H8(), W0);
e.EOR(indices.B16(), indices.B16(), Q1.B16());
// Modulo-16 the indices
e.MOV(W0, 0b0000'1111);
e.DUP(Q1.H8(), W0);
e.AND(indices.B16(), indices.B16(), Q1.B16());
// Convert int16 indices into int8
e.MOV(W0, 0x02'02);
e.DUP(Q1.H8(), W0);
e.MUL(indices.H8(), indices.H8(), Q1.H8());
e.MOV(W0, 0x01'00);
e.DUP(Q1.H8(), W0);
e.ADD(indices.H8(), indices.H8(), Q1.H8());
// Table-registers must be sequential indices
const QReg table_lo = Q2;
if (i.src2.is_constant) {
e.LoadConstantV(table_lo, i.src2.constant());
} else {
e.MOV(table_lo.B16(), i.src2.reg().B16());
}
const QReg table_hi = Q3;
if (i.src3.is_constant) {
e.LoadConstantV(table_hi, i.src3.constant());
} else {
e.MOV(table_hi.B16(), i.src3.reg().B16());
}
e.TBL(i.dest.reg().B16(), List{table_lo.B16(), table_hi.B16()},
indices.B16());
}
static void EmitByInt32(A64Emitter& e, const EmitArgType& i) {
assert_always();