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drcbec: compute flags correctly for ADDC/SUBB [R. Belmont]

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This commit is contained in:
R. Belmont 2012-08-10 03:49:24 +00:00
parent 1dd09a2976
commit 1e6024bd05
1 changed files with 16 additions and 2 deletions
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18
src/emu/cpu/drcbec.c
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@ -938,7 +938,15 @@ int drcbe_c::execute(code_handle &entry)
if (PARAM2 + 1 != 0)
flags = FLAGS32_NZCV_ADD(temp32, PARAM1, PARAM2 + (flags & FLAG_C));
else
flags = FLAGS32_NZCV_ADD(temp32, PARAM1 + (flags & FLAG_C), PARAM2);
{
if ((PARAM2 == 0xffffffff) && (flags & FLAG_C))
{
flags = FLAGS32_NZCV_ADD(temp32, PARAM1 + (flags & FLAG_C), PARAM2);
flags |= FLAG_C;
}
else
flags = FLAGS32_NZCV_ADD(temp32, PARAM1 + (flags & FLAG_C), PARAM2);
}
PARAM0 = temp32;
break;
@ -958,10 +966,16 @@ int drcbe_c::execute(code_handle &entry)
case MAKE_OPCODE_SHORT(OP_SUBB, 4, 1):
temp32 = PARAM1 - PARAM2 - (flags & FLAG_C);
temp64 = (UINT64)PARAM1 - (UINT64)PARAM2 - (UINT64)(flags & FLAG_C);
if (PARAM2 + 1 != 0)
flags = FLAGS32_NZCV_SUB(temp32, PARAM1, PARAM2 + (flags & FLAG_C));
else
flags = FLAGS32_NZCV_SUB(temp32, PARAM1 - (flags & FLAG_C), PARAM2);
{
flags = FLAGS32_NZCV_SUB(temp32, PARAM1 - (flags & FLAG_C), PARAM2);
flags &= ~(FLAG_C | FLAG_V);
flags |= ((temp64>>32) & 1) ? FLAG_C : 0;
flags |= (((PARAM1) ^ (PARAM2)) & ((PARAM1) ^ (temp64)) & 0x80000000) ? FLAG_V : 0;
}
PARAM0 = temp32;
break;