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-rw-r--r--src/core/arm/interpreter/armemu.cpp31
1 files changed, 20 insertions, 11 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index b9ac8b9ad..99fc6c45d 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -6192,18 +6192,27 @@ L_stm_s_takeabort:
//ichfly
//USAT16
{
- u8 tar = BITS(12, 15);
- u8 src = BITS(0, 3);
- u8 val = BITS(16, 19);
- s16 a1 = (state->Reg[src]);
- s16 a2 = (state->Reg[src] >> 0x10);
- s16 max = 0xFFFF >> (16 - val);
- if (max < a1) a1 = max;
- if (max < a2) a2 = max;
- u32 temp2 = ((u32)(a2)) << 0x10;
- state->Reg[tar] = (a1 & 0xFFFF) | (temp2);
+ const u8 rd_idx = BITS(12, 15);
+ const u8 rn_idx = BITS(0, 3);
+ const u8 num_bits = BITS(16, 19);
+ const s16 max = 0xFFFF >> (16 - num_bits);
+ s16 rn_lo = (state->Reg[rn_idx]);
+ s16 rn_hi = (state->Reg[rn_idx] >> 16);
+
+ if (max < rn_lo)
+ rn_lo = max;
+ else if (rn_lo < 0)
+ rn_lo = 0;
+
+ if (max < rn_hi)
+ rn_hi = max;
+ else if (rn_hi < 0)
+ rn_hi = 0;
+
+ state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi << 16) & 0xFFFF);
+ return 1;
}
- return 1;
+
default:
break;
}