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armemu: Fix SADD16

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The lo and hi parts of the result were being constructed as a result of hi and lo halfword intermixing from the rm and rn regs. However the lo part of the result should be constructed only from the lo halfwords of rm and rn, and the hi part of the result should only be constructed from the hi halfwords of rm and rn.
This commit is contained in:
Lioncash 2014-12-17 09:36:23 -05:00
parent fdb4ef5210
commit 5289a496a7
1 changed files with 9 additions and 8 deletions
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17
src/core/arm/interpreter/armemu.cpp
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@ -5811,14 +5811,15 @@ L_stm_s_takeabort:
state->Reg[tar] = ((a1 - a2) & 0xFFFF) | (((b1 - b2) & 0xFFFF) << 0x10); state->Reg[tar] = ((a1 - a2) & 0xFFFF) | (((b1 - b2) & 0xFFFF) << 0x10);
return 1; return 1;
} else if ((instr & 0xFF0) == 0xf10) { //sadd16 } else if ((instr & 0xFF0) == 0xf10) { //sadd16
u8 tar = BITS(12, 15); const u8 rd_idx = BITS(12, 15);
u8 src1 = BITS(16, 19); const u8 rm_idx = BITS(0, 3);
u8 src2 = BITS(0, 3); const u8 rn_idx = BITS(16, 19);
s16 a1 = (state->Reg[src1] & 0xFFFF); const s16 rm_lo = (state->Reg[rm_idx] & 0xFFFF);
s16 a2 = ((state->Reg[src1] >> 0x10) & 0xFFFF); const s16 rm_hi = ((state->Reg[rm_idx] >> 16) & 0xFFFF);
s16 b1 = (state->Reg[src2] & 0xFFFF); const s16 rn_lo = (state->Reg[rn_idx] & 0xFFFF);
s16 b2 = ((state->Reg[src2] >> 0x10) & 0xFFFF); const s16 rn_hi = ((state->Reg[rn_idx] >> 16) & 0xFFFF);
state->Reg[tar] = ((a1 + a2) & 0xFFFF) | (((b1 + b2) & 0xFFFF) << 0x10);
state->Reg[rd_idx] = ((rn_lo + rm_lo) & 0xFFFF) | (((rn_hi + rm_hi) & 0xFFFF) << 16);
return 1; return 1;
} else if ((instr & 0xFF0) == 0xf50) { //ssax } else if ((instr & 0xFF0) == 0xf50) { //ssax
u8 tar = BITS(12, 15); u8 tar = BITS(12, 15);