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Fixing decoding of some of the opcode 63 instructions.

This commit is contained in:
Ben Vanik 2013-05-31 00:09:10 -07:00
parent 14c3b8a382
commit dc16653164
1 changed files with 22 additions and 1 deletions
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23
src/xenia/cpu/ppc/instr_tables.h
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@ -30,6 +30,25 @@ static InstrType* instr_table_prep(
return prep;
}
static InstrType* instr_table_prep_63(
InstrType* unprep, int unprep_count, int a, int b) {
// Special handling for A format instructions.
int prep_count = (int)pow(2.0, b - a + 1);
InstrType* prep = (InstrType*)xe_calloc(prep_count * sizeof(InstrType));
for (int n = 0; n < unprep_count; n++) {
int ordinal = XESELECTBITS(unprep[n].opcode, a, b);
if (unprep[n].format == kXEPPCInstrFormatA) {
// Must splat this into all of the slots that it could be in.
for (int m = 0; m < 32; m++) {
prep[ordinal + (m << 5)] = unprep[n];
}
} else {
prep[ordinal] = unprep[n];
}
}
return prep;
}
#define EMPTY(slot) {0}
#define INSTRUCTION(name, opcode, format, type, flag) { \
@ -244,6 +263,8 @@ static InstrType* instr_table_62 = instr_table_prep(
instr_table_62_unprep, XECOUNT(instr_table_62_unprep), 0, 1);
// Opcode = 63, index = bits 10-1 (10)
// NOTE: the A format instructions need some special handling because
// they only use 6bits to identify their index.
static InstrType instr_table_63_unprep[] = {
INSTRUCTION(fcmpu, 0xFC000000, X , General , 0),
INSTRUCTION(frspx, 0xFC000018, X , General , 0),
@ -275,7 +296,7 @@ static InstrType instr_table_63_unprep[] = {
INSTRUCTION(fctidzx, 0xFC00065E, X , General , 0),
INSTRUCTION(fcfidx, 0xFC00069C, X , General , 0),
};
static InstrType* instr_table_63 = instr_table_prep(
static InstrType* instr_table_63 = instr_table_prep_63(
instr_table_63_unprep, XECOUNT(instr_table_63_unprep), 1, 10);
// Main table, index = bits 31-26 (6) : (code >> 26)