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PGXP: Treat add rd, rs, zero as moves 

Fixes exploding vertices in BIOS intro.

Needs further investigation as to why this fixes it - clearly the actual
oepration is incorrect.
This commit is contained in:
Connor McLaughlin 2020-12-04 01:07:34 +10:00
parent 59ac365b52
commit 52dbcbaca5
1 changed files with 44 additions and 34 deletions
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10
src/core/pgxp.cpp
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@ -901,6 +901,8 @@ void CPU_ADDI(u32 instr, u32 rtVal, u32 rsVal)
tempImm.d = imm(instr);
tempImm.sd = (tempImm.sd << 16) >> 16; // sign extend
if (tempImm.d != 0)
{
ret.x = (float)f16Unsign(ret.x);
ret.x += (float)tempImm.w.l;
@ -912,6 +914,7 @@ void CPU_ADDI(u32 instr, u32 rtVal, u32 rsVal)
// truncate on overflow/underflow
ret.y += (ret.y > SHRT_MAX) ? -(USHRT_MAX + 1) : (ret.y < SHRT_MIN) ? USHRT_MAX + 1 : 0.f;
}
CPU_reg[rt(instr)] = ret;
CPU_reg[rt(instr)].value = rtVal;
@ -1069,6 +1072,8 @@ void CPU_ADD(u32 instr, u32 rdVal, u32 rsVal, u32 rtVal)
Validate(&CPU_reg[rs(instr)], rsVal);
Validate(&CPU_reg[rt(instr)], rtVal);
if (rtVal != 0)
{
// iCB: Only require one valid input
if (((CPU_reg[rt(instr)].flags & VALID_01) != VALID_01) != ((CPU_reg[rs(instr)].flags & VALID_01) != VALID_01))
{
@ -1096,6 +1101,11 @@ void CPU_ADD(u32 instr, u32 rdVal, u32 rsVal, u32 rtVal)
ret.gFlags |= CPU_reg[rt(instr)].gFlags;
ret.lFlags |= CPU_reg[rt(instr)].lFlags;
ret.hFlags |= CPU_reg[rt(instr)].hFlags;
}
else
{
ret = CPU_reg[rs(instr)];
}
ret.value = rdVal;