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-rw-r--r--src/core/arm/interpreter/armemu.cpp78
1 files changed, 28 insertions, 50 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index b9c2aa6c2..43b1ba40e 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -5881,67 +5881,45 @@ L_stm_s_takeabort:
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;
+ s32 lo_val1, lo_val2;
+ s32 hi_val1, 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->GEFlag |= (1 << 16);
- else
- state->GEFlag &= ~(1 << 16);
-
- if (lo_val2 & 0x80)
- state->GEFlag |= (1 << 17);
- else
- state->GEFlag &= ~(1 << 17);
-
- if (hi_val1 & 0x80)
- state->GEFlag |= (1 << 18);
- else
- state->GEFlag &= ~(1 << 18);
-
- if (hi_val2 & 0x80)
- state->GEFlag |= (1 << 19);
- else
- state->GEFlag &= ~(1 << 19);
+ lo_val1 = (s32)(s8)(rn_val & 0xFF) + (s32)(s8)(rm_val & 0xFF);
+ lo_val2 = (s32)(s8)((rn_val >> 8) & 0xFF) + (s32)(s8)((rm_val >> 8) & 0xFF);
+ hi_val1 = (s32)(s8)((rn_val >> 16) & 0xFF) + (s32)(s8)((rm_val >> 16) & 0xFF);
+ hi_val2 = (s32)(s8)((rn_val >> 24) & 0xFF) + (s32)(s8)((rm_val >> 24) & 0xFF);
}
// 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));
+ lo_val1 = (s32)(s8)(rn_val & 0xFF) - (s32)(s8)(rm_val & 0xFF);
+ lo_val2 = (s32)(s8)((rn_val >> 8) & 0xFF) - (s32)(s8)((rm_val >> 8) & 0xFF);
+ hi_val1 = (s32)(s8)((rn_val >> 16) & 0xFF) - (s32)(s8)((rm_val >> 16) & 0xFF);
+ hi_val2 = (s32)(s8)((rn_val >> 24) & 0xFF) - (s32)(s8)((rm_val >> 24) & 0xFF);
+ }
- if (!(lo_val1 & 0x80))
- state->GEFlag |= (1 << 16);
- else
- state->GEFlag &= ~(1 << 16);
+ if (lo_val1 >= 0)
+ state->GEFlag |= (1 << 16);
+ else
+ state->GEFlag &= ~(1 << 16);
- if (!(lo_val2 & 0x80))
- state->GEFlag |= (1 << 17);
- else
- state->GEFlag &= ~(1 << 17);
+ if (lo_val2 >= 0)
+ state->GEFlag |= (1 << 17);
+ else
+ state->GEFlag &= ~(1 << 17);
- if (!(hi_val1 & 0x80))
- state->GEFlag |= (1 << 18);
- else
- state->GEFlag &= ~(1 << 18);
+ if (hi_val1 >= 0)
+ state->GEFlag |= (1 << 18);
+ else
+ state->GEFlag &= ~(1 << 18);
- if (!(hi_val2 & 0x80))
- state->GEFlag |= (1 << 19);
- else
- state->GEFlag &= ~(1 << 19);
- }
+ if (hi_val2 >= 0)
+ state->GEFlag |= (1 << 19);
+ else
+ state->GEFlag &= ~(1 << 19);
- state->Reg[rd_idx] = (lo_val1 | lo_val2 << 8 | hi_val1 << 16 | hi_val2 << 24);
+ state->Reg[rd_idx] = ((lo_val1 & 0xFF) | ((lo_val2 & 0xFF) << 8) | ((hi_val1 & 0xFF) << 16) | ((hi_val2 & 0xFF) << 24));
return 1;
}
else {