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[a64] Use LoadV128Const for OPCODE_SPLAT(constant)

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Should allow certain splats to opportunistically emit the best assembly when possible.
Also use `std::bit_cast` rather than an inline `union` type to directly
cast a `float` into a `uint32_t`.
This commit is contained in:
Wunkolo
2026-03-23 18:52:38 -07:00
committed by Heel
parent 33aa579b0c
commit a045586e8e
1 changed files with 5 additions and 15 deletions
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20
src/xenia/cpu/backend/a64/a64_seq_vector.cc
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@@ -31,8 +31,7 @@ volatile int anchor_vector = 0;
struct SPLAT_I8 : Sequence<SPLAT_I8, I<OPCODE_SPLAT, V128Op, I8Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
if (i.src1.is_constant) {
e.movi(VReg(i.dest.reg().getIdx()).b16,
static_cast<uint8_t>(i.src1.constant()));
LoadV128Const(e, i.dest.reg().getIdx(), vec128b(i.src1.constant()));
} else {
e.dup(VReg(i.dest.reg().getIdx()).b16, i.src1);
}
@@ -41,8 +40,7 @@ struct SPLAT_I8 : Sequence<SPLAT_I8, I<OPCODE_SPLAT, V128Op, I8Op>> {
struct SPLAT_I16 : Sequence<SPLAT_I16, I<OPCODE_SPLAT, V128Op, I16Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
if (i.src1.is_constant) {
e.mov(e.w0, static_cast<uint64_t>(i.src1.constant() & 0xFFFF));
e.dup(VReg(i.dest.reg().getIdx()).h8, e.w0);
LoadV128Const(e, i.dest.reg().getIdx(), vec128s(i.src1.constant()));
} else {
e.dup(VReg(i.dest.reg().getIdx()).h8, i.src1);
}
@@ -51,10 +49,7 @@ struct SPLAT_I16 : Sequence<SPLAT_I16, I<OPCODE_SPLAT, V128Op, I16Op>> {
struct SPLAT_I32 : Sequence<SPLAT_I32, I<OPCODE_SPLAT, V128Op, I32Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
if (i.src1.is_constant) {
uint32_t val = static_cast<uint32_t>(i.src1.constant());
// Use movz/movn via mov(xreg, uint64) for full 32-bit range.
e.mov(e.x0, static_cast<uint64_t>(val));
e.dup(VReg(i.dest.reg().getIdx()).s4, e.w0);
LoadV128Const(e, i.dest.reg().getIdx(), vec128i(i.src1.constant()));
} else {
e.dup(VReg(i.dest.reg().getIdx()).s4, i.src1);
}
@@ -63,13 +58,8 @@ struct SPLAT_I32 : Sequence<SPLAT_I32, I<OPCODE_SPLAT, V128Op, I32Op>> {
struct SPLAT_F32 : Sequence<SPLAT_F32, I<OPCODE_SPLAT, V128Op, F32Op>> {
static void Emit(A64Emitter& e, const EmitArgType& i) {
if (i.src1.is_constant) {
union {
float f;
uint32_t u;
} c;
c.f = i.src1.constant();
e.mov(e.w0, static_cast<uint64_t>(c.u));
e.dup(VReg(i.dest.reg().getIdx()).s4, e.w0);
LoadV128Const(e, i.dest.reg().getIdx(),
vec128i(std::bit_cast<uint32_t, float>(i.src1.constant())));
} else {
int src_idx = i.src1.reg().getIdx();
e.dup(VReg(i.dest.reg().getIdx()).s4, VReg(src_idx).s4[0]);