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Accurate FI

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RipleyTom 2024-01-24 05:59:17 +01:00 • committed by Elad.Ash
parent 85f4c38b4e
commit a92b8acba7
2 changed files with 43 additions and 48 deletions
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22
rpcs3/Emu/Cell/SPUASMJITRecompiler.cpp
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@ -3988,6 +3988,7 @@ void spu_recompiler::FI(spu_opcode_t op)
const XmmLink& vb_base = XmmAlloc();
const XmmLink& ymul = XmmAlloc();
const XmmLink& temp_reg = XmmAlloc();
const XmmLink& temp_reg2 = XmmAlloc();
c->movdqa(vb_base, vb);
c->movdqa(ymul, vb);
@ -4002,16 +4003,29 @@ void spu_recompiler::FI(spu_opcode_t op)
c->movdqa(temp_reg, vb_base);
c->psubd(temp_reg, ymul);
c->psrld(temp_reg, 9);
c->pcmpgtd(vb_base, ymul);
c->pand(vb_base, XmmConst(v128::from32p(1 << 23)));
c->paddd(temp_reg, vb_base);
// Makes signed comparison unsigned and determines if we need to adjust exponent
auto xor_const = XmmConst(v128::from32p(0x80000000));
c->pxor(ymul, xor_const);
c->pxor(vb_base, xor_const);
c->pcmpgtd(ymul, vb_base);
c->movdqa(vb_base, ymul);
c->movdqa(temp_reg2, temp_reg);
c->pand(temp_reg2, vb_base);
c->psrld(temp_reg2, 8); // only shift right by 8 if exponent is adjusted
c->xorps(vb_base, XmmConst(v128::from32p(0xFFFFFFFF))); // Invert the mask
c->pand(temp_reg, vb_base);
c->psrld(temp_reg, 9); // shift right by 9 if not adjusted
c->por(temp_reg, temp_reg2);
c->pand(vb, XmmConst(v128::from32p(0xff800000u)));
c->pand(temp_reg, XmmConst(v128::from32p(~0xff800000u)));
c->por(vb, temp_reg);
c->pand(ymul, XmmConst(v128::from32p(1 << 23)));
c->psubd(vb, ymul);
c->movaps(SPU_OFF_128(gpr, op.rt), vb);
}