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armemu: Combine SSUB16, SADD16, SASX, and SSAX.

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This commit is contained in:
Lioncash 2014-12-17 21:14:42 -05:00
parent 075126247f
commit 85c318078d
1 changed files with 23 additions and 34 deletions
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57
src/core/arm/interpreter/armemu.cpp
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@ -5805,8 +5805,10 @@ L_stm_s_takeabort:
case 0x3f:
printf ("Unhandled v6 insn: rbit\n");
break;
case 0x61:
if ((instr & 0xFF0) == 0xf70) { //ssub16
case 0x61: // SSUB16, SADD16, SSAX, and SASX
if ((instr & 0xFF0) == 0xf70 || (instr & 0xFF0) == 0xf10 ||
(instr & 0xFF0) == 0xf50 || (instr & 0xFF0) == 0xf30)
{
const u8 rd_idx = BITS(12, 15);
const u8 rm_idx = BITS(0, 3);
const u8 rn_idx = BITS(16, 19);
@ -5814,40 +5816,27 @@ L_stm_s_takeabort:
const s16 rn_hi = ((state->Reg[rn_idx] >> 16) & 0xFFFF);
const s16 rm_lo = (state->Reg[rm_idx] & 0xFFFF);
const s16 rm_hi = ((state->Reg[rm_idx] >> 16) & 0xFFFF);
state->Reg[rd_idx] = ((rn_lo - rm_lo) & 0xFFFF) | (((rn_hi - rm_hi) & 0xFFFF) << 16);
return 1;
} else if ((instr & 0xFF0) == 0xf10) { //sadd16
const u8 rd_idx = BITS(12, 15);
const u8 rm_idx = BITS(0, 3);
const u8 rn_idx = BITS(16, 19);
const s16 rm_lo = (state->Reg[rm_idx] & 0xFFFF);
const s16 rm_hi = ((state->Reg[rm_idx] >> 16) & 0xFFFF);
const s16 rn_lo = (state->Reg[rn_idx] & 0xFFFF);
const s16 rn_hi = ((state->Reg[rn_idx] >> 16) & 0xFFFF);
state->Reg[rd_idx] = ((rn_lo + rm_lo) & 0xFFFF) | (((rn_hi + rm_hi) & 0xFFFF) << 16);
// SSUB16
if ((instr & 0xFF0) == 0xf70) {
state->Reg[rd_idx] = ((rn_lo - rm_lo) & 0xFFFF) | (((rn_hi - rm_hi) & 0xFFFF) << 16);
}
// SADD16
else if ((instr & 0xFF0) == 0xf10) {
state->Reg[rd_idx] = ((rn_lo + rm_lo) & 0xFFFF) | (((rn_hi + rm_hi) & 0xFFFF) << 16);
}
// SSAX
else if ((instr & 0xFF0) == 0xf50) {
state->Reg[rd_idx] = ((rn_lo + rm_hi) & 0xFFFF) | (((rn_hi - rm_lo) & 0xFFFF) << 16);
}
// SASX
else {
state->Reg[rd_idx] = ((rn_lo - rm_hi) & 0xFFFF) | (((rn_hi + rm_lo) & 0xFFFF) << 16);
}
return 1;
} else if ((instr & 0xFF0) == 0xf50) { //ssax
u8 tar = BITS(12, 15);
u8 src1 = BITS(16, 19);
u8 src2 = BITS(0, 3);
s16 a1 = (state->Reg[src1] & 0xFFFF);
s16 a2 = ((state->Reg[src1] >> 0x10) & 0xFFFF);
s16 b1 = (state->Reg[src2] & 0xFFFF);
s16 b2 = ((state->Reg[src2] >> 0x10) & 0xFFFF);
state->Reg[tar] = ((a1 + b2) & 0xFFFF) | (((a2 - b1) & 0xFFFF) << 0x10);
return 1;
} else if ((instr & 0xFF0) == 0xf30) { //sasx
u8 tar = BITS(12, 15);
u8 src1 = BITS(16, 19);
u8 src2 = BITS(0, 3);
s16 a1 = (state->Reg[src1] & 0xFFFF);
s16 a2 = ((state->Reg[src1] >> 0x10) & 0xFFFF);
s16 b1 = (state->Reg[src2] & 0xFFFF);
s16 b2 = ((state->Reg[src2] >> 0x10) & 0xFFFF);
state->Reg[tar] = ((a1 - b2) & 0xFFFF) | (((a2 + b1) & 0xFFFF) << 0x10);
return 1;
} else printf ("Unhandled v6 insn: sadd/ssub/ssax/sasx\n");
} else {
printf("Unhandled v6 insn: %08x", BITS(20, 27));
}
break;
case 0x62: // QSUB16 and QADD16
if ((instr & 0xFF0) == 0xf70 || (instr & 0xFF0) == 0xf10) {