Macintosh-Tools
/
dingusppc
mirror of https://github.com/dingusdev/dingusppc.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Implement VX and FEX updates for mtfsfi

This commit is contained in:
dingusdev 2024-04-09 21:11:09 -07:00
parent 2c94cfee03
commit 9c95bc17fe
1 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
cpu/ppc/ppcfpopcodes.cpp
View File

@ -127,6 +127,24 @@ static void fpresult_update(double set_result) {
}
}
static void ppc_update_vx() {
uint32_t fpscr_check = ppc_state.fpscr & 0x1F80700U;
if (fpscr_check)
ppc_state.fpscr |= VX;
else
ppc_state.fpscr &= ~VX;
}
static void ppc_update_fex() {
uint32_t fpscr_check = (((ppc_state.fpscr >> 25) & 0x1F) &
((ppc_state.fpscr >> 3) & 0x1F));
if (fpscr_check)
ppc_state.fpscr |= VX;
else
ppc_state.fpscr &= ~VX;
}
// Floating Point Arithmetic
template <field_rc rec>
void dppc_interpreter::ppc_fadd() {
@ -879,7 +897,9 @@ void dppc_interpreter::ppc_mtfsfi() {
// copy imm to FPSCR[crf_d] under control of the field mask
ppc_state.fpscr = (ppc_state.fpscr & ~mask) | ((imm >> crf_d) & mask);
// TODO: update FEX and VX according to the "usual rule"
// Update FEX and VX according to the "usual rule"
ppc_update_vx();
ppc_update_fex();
if (rec)
ppc_update_cr1();