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ppcfpopcodes: fix mtfsfi emulation.

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This commit is contained in:
Maxim Poliakovski 2024-01-02 16:12:12 +01:00
parent 61a90e2cfb
commit 8595dd7d99
1 changed files with 10 additions and 5 deletions
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15
cpu/ppc/ppcfpopcodes.cpp
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@ -892,11 +892,16 @@ void dppc_interpreter::ppc_mtfsf() {
} }
void dppc_interpreter::ppc_mtfsfi() { void dppc_interpreter::ppc_mtfsfi() {
ppc_result_b = (ppc_cur_instruction >> 11) & 15; int crf_d = (ppc_cur_instruction >> 21) & 0x1C;
crf_d = (ppc_cur_instruction >> 23) & 7; uint32_t imm = (ppc_cur_instruction << 16) & 0xF0000000UL;
crf_d = crf_d << 2;
ppc_state.fpscr = (ppc_state.cr & ~(0xF0000000UL >> crf_d)) | // prepare field mask and ensure that neither FEX nor VX will be changed
((ppc_state.spr[SPR::XER] & 0xF0000000UL) >> crf_d); uint32_t mask = (0xF0000000UL >> crf_d) & ~(FPSCR::FEX | FPSCR::VX);
// 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"
if (rc_flag) if (rc_flag)
ppc_update_cr1(); ppc_update_cr1();