Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-25 17:56:43 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

mips3: Fixes for IDT-specific instructions. [Ryan Holtz] (#12958)

Browse Source 
Co-authored-by: Ryan Holtz <TheMogMiner>
This commit is contained in:
MooglyGuy 2024-11-10 15:50:09 +01:00 committed by GitHub
parent 636ef26134
commit 13110ff98b
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/devices/cpu/mips/mips3.cpp
View File

@ -3906,8 +3906,28 @@ void mips3_device::handle_idt(uint32_t op)
{
switch (op & 0x1f)
{
case 0: /* MAD */
if (RSREG != 0 && RTREG != 0)
{
int64_t temp64 = (int64_t)(int32_t)RSVAL32 * (int64_t)(int32_t)RTVAL32;
temp64 += ((int64_t)m_core->r[REG_HI] << 32) | m_core->r[REG_LO];
m_core->r[REG_LO] = (int32_t)temp64;
m_core->r[REG_HI] = (int32_t)(temp64 >> 32);
}
m_core->icount -= 3;
break;
case 1: /* MADU */
if (RSREG != 0 && RTREG != 0)
{
uint64_t temp64 = (uint64_t)RSVAL32 * (uint64_t)RTVAL32;
temp64 += ((uint64_t)m_core->r[REG_HI] << 32) | m_core->r[REG_LO];
m_core->r[REG_LO] = (uint32_t)temp64;
m_core->r[REG_HI] = (uint32_t)(temp64 >> 32);
}
m_core->icount -= 3;
break;
case 2: /* MUL */
RDVAL64 = (int32_t)((int32_t)RSVAL32 * (int32_t)RTVAL32);
if (RDREG) RDVAL64 = (int32_t)((int32_t)RSVAL32 * (int32_t)RTVAL32);
m_core->icount -= 3;
break;
default:

2
src/devices/cpu/mips/mips3dsm.cpp
View File

@ -406,7 +406,7 @@ uint32_t mips3_disassembler::dasm_idt(uint32_t pc, uint32_t op, std::ostream &st
{
case 0: util::stream_format(stream, "mad %s,%s", reg[rs], reg[rt]); break;
case 1: util::stream_format(stream, "madu %s,%s", reg[rs], reg[rt]); break;
case 2: util::stream_format(stream, "mul %s,%s,%s", reg[rs], reg[rt], reg[rd]); break;
case 2: util::stream_format(stream, "mul %s,%s,%s", reg[rd], reg[rs], reg[rt]); break;
case 4: util::stream_format(stream, "msub %s,%s", reg[rs], reg[rt]); break;
default:util::stream_format(stream, "dc.l $%08x [invalid]", op); break;
}