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ppcopcodes: refactor mtcrf emulation.

This commit is contained in:
Maxim Poliakovski 2024-01-02 17:43:17 +01:00
parent c25b027de4
commit 5b114c2412
1 changed files with 17 additions and 12 deletions
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29
cpu/ppc/ppcopcodes.cpp
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@ -1063,19 +1063,24 @@ void dppc_interpreter::ppc_mftb() {
}
void dppc_interpreter::ppc_mtcrf() {
uint32_t cr_mask = 0;
ppc_grab_regssa();
crm = ((ppc_cur_instruction >> 12) & 255);
// check this
cr_mask = (crm & 128) ? 0xF0000000 : 0x00000000;
cr_mask += (crm & 64) ? 0x0F000000 : 0x00000000;
cr_mask += (crm & 32) ? 0x00F00000 : 0x00000000;
cr_mask += (crm & 16) ? 0x000F0000 : 0x00000000;
cr_mask += (crm & 8) ? 0x0000F000 : 0x00000000;
cr_mask += (crm & 4) ? 0x00000F00 : 0x00000000;
cr_mask += (crm & 2) ? 0x000000F0 : 0x00000000;
cr_mask += (crm & 1) ? 0x0000000F : 0x00000000;
ppc_state.cr = (ppc_result_d & cr_mask) | (ppc_state.cr & ~(cr_mask));
uint8_t crm = (ppc_cur_instruction >> 12) & 0xFFU;
uint32_t cr_mask = 0;
if (crm == 0xFFU) // the fast case
cr_mask = 0xFFFFFFFFUL;
else { // the slow case
if (crm & 0x80) cr_mask |= 0xF0000000UL;
if (crm & 0x40) cr_mask |= 0x0F000000UL;
if (crm & 0x20) cr_mask |= 0x00F00000UL;
if (crm & 0x10) cr_mask |= 0x000F0000UL;
if (crm & 0x08) cr_mask |= 0x0000F000UL;
if (crm & 0x04) cr_mask |= 0x00000F00UL;
if (crm & 0x02) cr_mask |= 0x000000F0UL;
if (crm & 0x01) cr_mask |= 0x0000000FUL;
}
ppc_state.cr = (ppc_state.cr & ~cr_mask) | (ppc_result_d & cr_mask);
}
void dppc_interpreter::ppc_mcrxr() {