Merge pull request #297 from lioncash/ssub16

armemu: Fix SSUB16

1 files changed, 8 insertions, 8 deletions

diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index 1a589e39..2b5d8c68 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -5801,14 +5801,14 @@ L_stm_s_takeabort:
             break;
         case 0x61:
             if ((instr & 0xFF0) == 0xf70) { //ssub16
-                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 - a2) & 0xFFFF) | (((b1 - b2) & 0xFFFF) << 0x10);
+                const u8 rd_idx = BITS(12, 15);
+                const u8 rm_idx = BITS(0, 3);
+                const u8 rn_idx = BITS(16, 19);
+                const s16 rn_lo = (state->Reg[rn_idx] & 0xFFFF);
+                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);