N-archive/citra
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Merge pull request #323 from lioncash/saddsub

Browse source 
armemu: Implement SADD8/SSUB8
This commit is contained in:
bunnei 2014-12-21 00:10:12 -05:00
parent cdfe665a21 855eda6f85
commit 0f696037f6
1 changed files with 87 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

101
src/core/arm/interpreter/armemu.cpp
View file

@ -5824,9 +5824,9 @@ L_stm_s_takeabort:
case 0x3f:
printf ("Unhandled v6 insn: rbit\n");
break;
case 0x61: // SSUB16, SADD16, SSAX, and SASX
if ((instr & 0xFF0) == 0xf70 || (instr & 0xFF0) == 0xf10 ||
(instr & 0xFF0) == 0xf50 || (instr & 0xFF0) == 0xf30)
case 0x61: // SADD16, SASX, SSAX, and SSUB16
if ((instr & 0xFF0) == 0xf10 || (instr & 0xFF0) == 0xf30 ||
(instr & 0xFF0) == 0xf50 || (instr & 0xFF0) == 0xf70)
{
const u8 rd_idx = BITS(12, 15);
const u8 rm_idx = BITS(0, 3);
@ -5839,25 +5839,25 @@ L_stm_s_takeabort:
s32 lo_result;
s32 hi_result;
// SSUB16
if ((instr & 0xFF0) == 0xf70) {
lo_result = (rn_lo - rm_lo);
hi_result = (rn_hi - rm_hi);
}
// SADD16
else if ((instr & 0xFF0) == 0xf10) {
if ((instr & 0xFF0) == 0xf10) {
lo_result = (rn_lo + rm_lo);
hi_result = (rn_hi + rm_hi);
}
// SASX
else if ((instr & 0xFF0) == 0xf30) {
lo_result = (rn_lo - rm_hi);
hi_result = (rn_hi + rm_lo);
}
// SSAX
else if ((instr & 0xFF0) == 0xf50) {
lo_result = (rn_lo + rm_hi);
hi_result = (rn_hi - rm_lo);
}
// SASX
// SSUB16
else {
lo_result = (rn_lo - rm_hi);
hi_result = (rn_hi + rm_lo);
lo_result = (rn_lo - rm_lo);
hi_result = (rn_hi - rm_hi);
}
state->Reg[rd_idx] = (lo_result & 0xFFFF) | ((hi_result & 0xFFFF) << 16);
@ -5878,8 +5878,81 @@ L_stm_s_takeabort:
state->Cpsr &= ~(1 << 19);
}
return 1;
} else {
printf("Unhandled v6 insn: %08x", BITS(20, 27));
}
// SADD8/SSUB8
else if ((instr & 0xFF0) == 0xf90 || (instr & 0xFF0) == 0xff0)
{
const u8 rd_idx = BITS(12, 15);
const u8 rm_idx = BITS(0, 3);
const u8 rn_idx = BITS(16, 19);
const u32 rm_val = state->Reg[rm_idx];
const u32 rn_val = state->Reg[rn_idx];
u8 lo_val1;
u8 lo_val2;
u8 hi_val1;
u8 hi_val2;
// SADD8
if ((instr & 0xFF0) == 0xf90) {
lo_val1 = (u8)((rn_val & 0xFF) + (rm_val & 0xFF));
lo_val2 = (u8)(((rn_val >> 8) & 0xFF) + ((rm_val >> 8) & 0xFF));
hi_val1 = (u8)(((rn_val >> 16) & 0xFF) + ((rm_val >> 16) & 0xFF));
hi_val2 = (u8)(((rn_val >> 24) & 0xFF) + ((rm_val >> 24) & 0xFF));
if (lo_val1 & 0x80)
state->Cpsr |= (1 << 16);
else
state->Cpsr &= ~(1 << 16);
if (lo_val2 & 0x80)
state->Cpsr |= (1 << 17);
else
state->Cpsr &= ~(1 << 17);
if (hi_val1 & 0x80)
state->Cpsr |= (1 << 18);
else
state->Cpsr &= ~(1 << 18);
if (hi_val2 & 0x80)
state->Cpsr |= (1 << 19);
else
state->Cpsr &= ~(1 << 19);
}
// SSUB8
else {
lo_val1 = (u8)((rn_val & 0xFF) - (rm_val & 0xFF));
lo_val2 = (u8)(((rn_val >> 8) & 0xFF) - ((rm_val >> 8) & 0xFF));
hi_val1 = (u8)(((rn_val >> 16) & 0xFF) - ((rm_val >> 16) & 0xFF));
hi_val2 = (u8)(((rn_val >> 24) & 0xFF) - ((rm_val >> 24) & 0xFF));
if (!(lo_val1 & 0x80))
state->Cpsr |= (1 << 16);
else
state->Cpsr &= ~(1 << 16);
if (!(lo_val2 & 0x80))
state->Cpsr |= (1 << 17);
else
state->Cpsr &= ~(1 << 17);
if (!(hi_val1 & 0x80))
state->Cpsr |= (1 << 18);
else
state->Cpsr &= ~(1 << 18);
if (!(hi_val2 & 0x80))
state->Cpsr |= (1 << 19);
else
state->Cpsr &= ~(1 << 19);
}
state->Reg[rd_idx] = (lo_val1 | lo_val2 << 8 | hi_val1 << 16 | hi_val2 << 24);
return 1;
}
else {
printf("Unhandled v6 insn: %08x", instr);
}
break;
case 0x62: // QADD16, QASX, QSAX, and QSUB16