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Merge pull request #311 from lioncash/usada 

armemu: Implement USAD8 and USADA8
This commit is contained in:
bunnei 2014-12-20 15:21:25 -05:00
parent 52bc58283d 00e8ec4a9e
commit 7095c4959b
1 changed files with 24 additions and 1 deletions
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25
src/core/arm/interpreter/armemu.cpp
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@ -6374,7 +6374,30 @@ L_stm_s_takeabort:
printf ("Unhandled v6 insn: smmla/smmls/smmul\n");
break;
case 0x78:
printf ("Unhandled v6 insn: usad/usada8\n");
if (BITS(20, 24) == 0x18)
{
const u8 rm_idx = BITS(8, 11);
const u8 rn_idx = BITS(0, 3);
const u8 rd_idx = BITS(16, 19);
const u32 rm_val = state->Reg[rm_idx];
const u32 rn_val = state->Reg[rn_idx];
const u8 diff1 = (u8)::abs((rn_val & 0xFF) - (rm_val & 0xFF));
const u8 diff2 = (u8)::abs(((rn_val >> 8) & 0xFF) - ((rm_val >> 8) & 0xFF));
const u8 diff3 = (u8)::abs(((rn_val >> 16) & 0xFF) - ((rm_val >> 16) & 0xFF));
const u8 diff4 = (u8)::abs(((rn_val >> 24) & 0xFF) - ((rm_val >> 24) & 0xFF));
u32 finalDif = (diff1 + diff2 + diff3 + diff4);
// Op is USADA8 if true.
const u8 ra_idx = BITS(12, 15);
if (ra_idx != 15)
finalDif += state->Reg[ra_idx];
state->Reg[rd_idx] = finalDif;
return 1;
}
break;
case 0x7a:
printf ("Unhandled v6 insn: usbfx\n");