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CPU/PGXP: sub rd, rs, 0 => move rd, rs

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Stenzek 2024-05-17 21:13:12 +10:00
parent bbac7a60a0
commit 5672b0da95
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1 changed files with 25 additions and 18 deletions
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43
src/core/cpu_pgxp.cpp
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@ -975,31 +975,38 @@ void CPU::PGXP::CPU_SUB(u32 instr, u32 rsVal, u32 rtVal)
Validate(&g_state.pgxp_gpr[rs(instr)], rsVal);
Validate(&g_state.pgxp_gpr[rt(instr)], rtVal);
// iCB: Only require one valid input
if (((g_state.pgxp_gpr[rt(instr)].flags & VALID_XY) != VALID_XY) !=
((g_state.pgxp_gpr[rs(instr)].flags & VALID_XY) != VALID_XY))
PGXP_value ret;
if (rtVal == 0)
{
MakeValid(&g_state.pgxp_gpr[rs(instr)], rsVal);
MakeValid(&g_state.pgxp_gpr[rt(instr)], rtVal);
ret = g_state.pgxp_gpr[rs(instr)];
}
else
{
// iCB: Only require one valid input
if (((g_state.pgxp_gpr[rt(instr)].flags & VALID_XY) != VALID_XY) !=
((g_state.pgxp_gpr[rs(instr)].flags & VALID_XY) != VALID_XY))
{
MakeValid(&g_state.pgxp_gpr[rs(instr)], rsVal);
MakeValid(&g_state.pgxp_gpr[rt(instr)], rtVal);
}
PGXP_value ret = g_state.pgxp_gpr[rs(instr)];
ret.x = (float)f16Unsign(ret.x);
ret.x -= (float)f16Unsign(g_state.pgxp_gpr[rt(instr)].x);
ret = g_state.pgxp_gpr[rs(instr)];
ret.x = (float)f16Unsign(ret.x);
ret.x -= (float)f16Unsign(g_state.pgxp_gpr[rt(instr)].x);
// carry on over/underflow
float of = (ret.x > USHRT_MAX) ? 1.f : (ret.x < 0) ? -1.f : 0.f;
ret.x = (float)f16Sign(ret.x);
// ret.x -= of * (USHRT_MAX + 1);
ret.y -= g_state.pgxp_gpr[rt(instr)].y - of;
// carry on over/underflow
float of = (ret.x > USHRT_MAX) ? 1.f : (ret.x < 0) ? -1.f : 0.f;
ret.x = (float)f16Sign(ret.x);
// ret.x -= of * (USHRT_MAX + 1);
ret.y -= g_state.pgxp_gpr[rt(instr)].y - of;
// truncate on overflow/underflow
ret.y += (ret.y > SHRT_MAX) ? -(USHRT_MAX + 1) : (ret.y < SHRT_MIN) ? USHRT_MAX + 1 : 0.f;
// truncate on overflow/underflow
ret.y += (ret.y > SHRT_MAX) ? -(USHRT_MAX + 1) : (ret.y < SHRT_MIN) ? USHRT_MAX + 1 : 0.f;
ret.flags &= (g_state.pgxp_gpr[rt(instr)].flags & VALID_XY) | ~VALID_XY;
ret.flags &= (g_state.pgxp_gpr[rt(instr)].flags & VALID_XY) | ~VALID_XY;
ret.value = rsVal - rtVal;
ret.value = rsVal - rtVal;
}
if (!(ret.flags & VALID_Z) && (g_state.pgxp_gpr[rt(instr)].flags & VALID_Z))
{