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[a64] Optimize OPCODE_RECIP constants

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Loading the value `1.0` can be done with a singular `fmov` instruction rather than a generic `mov`+`dup` sequence
This commit is contained in:
Wunkolo
2026-03-23 19:31:37 -07:00
committed by Heel
parent 39706a0974
commit 095bbbbda1
1 changed files with 3 additions and 6 deletions
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9
src/xenia/cpu/backend/a64/a64_sequences.cc
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@@ -4717,8 +4717,7 @@ struct RECIP_F32 : Sequence<RECIP_F32, I<OPCODE_RECIP, F32Op, F32Op>> {
e.mov(e.w0, static_cast<uint64_t>(c.u));
e.fmov(e.s0, e.w0);
}
e.mov(e.w0, static_cast<uint64_t>(0x3F800000u));
e.fmov(e.s2, e.w0);
e.fmov(e.s2, 1.0f);
e.fdiv(i.dest, e.s2, src);
}
};
@@ -4734,8 +4733,7 @@ struct RECIP_F64 : Sequence<RECIP_F64, I<OPCODE_RECIP, F64Op, F64Op>> {
e.mov(e.x0, c.u);
e.fmov(e.d0, e.x0);
}
e.mov(e.x0, static_cast<uint64_t>(0x3FF0000000000000ull));
e.fmov(e.d2, e.x0);
e.fmov(e.d2, 1.0);
e.fdiv(i.dest, e.d2, src);
}
};
@@ -4751,8 +4749,7 @@ struct RECIP_V128 : Sequence<RECIP_V128, I<OPCODE_RECIP, V128Op, V128Op>> {
FlushDenormals_V128(e, 1); // scratch v2, v3
auto d = VReg(i.dest.reg().getIdx()).s4;
// Load 1.0f vector.
e.mov(e.w0, static_cast<uint64_t>(0x3F800000u));
e.dup(VReg(0).s4, e.w0);
e.fmov(VReg(0).s4, 1.0f);
e.fdiv(d, VReg(0).s4, VReg(1).s4);
// Flush output denormals.
FlushDenormals_V128(e, i.dest.reg().getIdx(), 0, 1);