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armemu: Implement SMLALD/SMLSLD

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This commit is contained in:
Lioncash 2014-12-24 09:26:48 -05:00
parent 2bbbe68399
commit 82c3962b95
1 changed files with 33 additions and 2 deletions
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35
src/core/arm/interpreter/armemu.cpp
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@ -6503,8 +6503,39 @@ L_stm_s_takeabort:
return 1;
}
break;
case 0x74:
printf ("Unhandled v6 insn: smlald/smlsld\n");
case 0x74: // SMLALD and SMLSLD
{
const u8 rm_idx = BITS(8, 11);
const u8 rn_idx = BITS(0, 3);
const u8 rdlo_idx = BITS(12, 15);
const u8 rdhi_idx = BITS(16, 19);
const bool do_swap = (BIT(5) == 1);
const u32 rdlo_val = state->Reg[rdlo_idx];
const u32 rdhi_val = state->Reg[rdhi_idx];
const u32 rn_val = state->Reg[rn_idx];
u32 rm_val = state->Reg[rm_idx];
if (do_swap)
rm_val = (((rm_val & 0xFFFF) << 16) | (rm_val >> 16));
const s32 product1 = (s16)(rn_val & 0xFFFF) * (s16)(rm_val & 0xFFFF);
const s32 product2 = (s16)((rn_val >> 16) & 0xFFFF) * (s16)((rm_val >> 16) & 0xFFFF);
s64 result;
// SMLALD
if (BIT(6) == 0) {
result = (product1 + product2) + (s64)(rdlo_val | ((s64)rdhi_val << 32));
}
// SMLSLD
else {
result = (product1 - product2) + (s64)(rdlo_val | ((s64)rdhi_val << 32));
}
state->Reg[rdlo_idx] = (result & 0xFFFFFFFF);
state->Reg[rdhi_idx] = ((result >> 32) & 0xFFFFFFFF);
return 1;
}
break;
case 0x75:
printf ("Unhandled v6 insn: smmla/smmls/smmul\n");