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-rw-r--r--src/core/arm/interpreter/armemu.cpp35
1 files changed, 33 insertions, 2 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp
index b2f671f94..27467bb5d 100644
--- a/src/core/arm/interpreter/armemu.cpp
+++ b/src/core/arm/interpreter/armemu.cpp
@@ -6503,8 +6503,39 @@ L_stm_s_takeabort:
return 1;
}
break;
- case 0x74:
- printf ("Unhandled v6 insn: smlald/smlsld\n");
+ case 0x74: // SMLALD and SMLSLD
+ {
+ const u8 rm_idx = BITS(8, 11);
+ const u8 rn_idx = BITS(0, 3);
+ const u8 rdlo_idx = BITS(12, 15);
+ const u8 rdhi_idx = BITS(16, 19);
+ const bool do_swap = (BIT(5) == 1);
+
+ const u32 rdlo_val = state->Reg[rdlo_idx];
+ const u32 rdhi_val = state->Reg[rdhi_idx];
+ const u32 rn_val = state->Reg[rn_idx];
+ u32 rm_val = state->Reg[rm_idx];
+
+ if (do_swap)
+ rm_val = (((rm_val & 0xFFFF) << 16) | (rm_val >> 16));
+
+ const s32 product1 = (s16)(rn_val & 0xFFFF) * (s16)(rm_val & 0xFFFF);
+ const s32 product2 = (s16)((rn_val >> 16) & 0xFFFF) * (s16)((rm_val >> 16) & 0xFFFF);
+ s64 result;
+
+ // SMLALD
+ if (BIT(6) == 0) {
+ result = (product1 + product2) + (s64)(rdlo_val | ((s64)rdhi_val << 32));
+ }
+ // SMLSLD
+ else {
+ result = (product1 - product2) + (s64)(rdlo_val | ((s64)rdhi_val << 32));
+ }
+
+ state->Reg[rdlo_idx] = (result & 0xFFFFFFFF);
+ state->Reg[rdhi_idx] = ((result >> 32) & 0xFFFFFFFF);
+ return 1;
+ }
break;
case 0x75:
printf ("Unhandled v6 insn: smmla/smmls/smmul\n");