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trying to simplify branches

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iris
2026-05-15 18:11:07 +02:00
parent b2f415a6ea
commit e48f6a6402
4 changed files with 143 additions and 66 deletions
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core/broadway.cpp
+20 -10
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@@ -28,23 +28,27 @@ ircolib::u32 broadway::fetch(mem &mem) {
return val;
}
void broadway::decode_special(ircolib::u32 instr, mem &mem) {
switch (utils::secondary(instr)) {
case 0x153:
mfspr(instr);
void broadway::decode_special2(ircolib::u32 instr, mem &mem) {
auto secondary = utils::secondary(instr);
switch (secondary) {
case 0x0D2: // mtsr
ircolib::warn("broadway TODO mtsr (pc 0x{:08X})", pc - 4);
break;
case 0x153:
case 0x1D3:
mtspr(instr);
mftspr(ircolib::is_bit_set<ircolib::u32, 7>(secondary), instr);
break;
case 0x10A:
add(instr);
break;
case 0x256: // sync
break;
default:
ircolib::panic("broadway unknown special 0x{:04X} (pc 0x{:08X})", utils::secondary(instr), pc - 4);
ircolib::panic("broadway unknown special2 {} (0x{:04X}) (pc 0x{:08X})", secondary, secondary, pc - 4);
}
}
void broadway::decode_branch(ircolib::u32 instr, mem &mem) {
void broadway::decode_special1(ircolib::u32 instr, mem &mem) {
switch (utils::secondary(instr)) {
case 0x10:
bclrx(instr);
@@ -52,8 +56,11 @@ void broadway::decode_branch(ircolib::u32 instr, mem &mem) {
case 0x32:
rfi(instr);
break;
case 0x96: // isync
break;
default:
ircolib::panic("broadway unknown branch 0x{:04X} (pc 0x{:08X})", utils::secondary(instr), pc - 4);
ircolib::panic("broadway unknown special1 {} (0x{:04X}) (pc 0x{:08X})", utils::secondary(instr),
utils::secondary(instr), pc - 4);
}
}
@@ -75,7 +82,7 @@ void broadway::execute(ircolib::u32 instr, mem &mem) {
bx(instr);
break;
case 19:
decode_branch(instr, mem);
decode_special1(instr, mem);
break;
case 21:
rlwinm(instr);
@@ -86,8 +93,11 @@ void broadway::execute(ircolib::u32 instr, mem &mem) {
case 25:
oris(instr);
break;
case 28:
andi(instr);
break;
case 31:
decode_special(instr, mem);
decode_special2(instr, mem);
break;
case 32: // lwz rd, d(ra)
lwz(instr, mem);