diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/arm/interpreter/armemu.cpp | 32 | ||||
| -rw-r--r-- | src/core/arm/interpreter/armsupp.cpp | 8 | ||||
| -rw-r--r-- | src/core/arm/skyeye_common/armemu.h | 1 |
3 files changed, 28 insertions, 13 deletions
diff --git a/src/core/arm/interpreter/armemu.cpp b/src/core/arm/interpreter/armemu.cpp index 578d71380..23469f4df 100644 --- a/src/core/arm/interpreter/armemu.cpp +++ b/src/core/arm/interpreter/armemu.cpp @@ -6478,22 +6478,28 @@ L_stm_s_takeabort: const s16 rn_lo = (rn_val & 0xFFFF); const s16 rn_hi = ((rn_val >> 16) & 0xFFFF); - // SMUAD - if ((instr & 0xf0d0) == 0xf010) { - state->Reg[rd_idx] = (rn_lo * rm_lo) + (rn_hi * rm_hi); - } - // SMUSD - else if ((instr & 0xf0d0) == 0xf050) { - state->Reg[rd_idx] = (rn_lo * rm_lo) - (rn_hi * rm_hi); - } - // SMLAD - else if ((instr & 0xd0) == 0x10) { - state->Reg[rd_idx] = (rn_lo * rm_lo) + (rn_hi * rm_hi) + (s32)state->Reg[ra_idx]; + const u32 product1 = (rn_lo * rm_lo); + const u32 product2 = (rn_hi * rm_hi); + + // SMUAD and SMLAD + if (BIT(6) == 0) { + state->Reg[rd_idx] = product1 + product2; + + if (BITS(12, 15) != 15) { + state->Reg[rd_idx] += state->Reg[ra_idx]; + ARMul_AddOverflowQ(state, product1 + product2, state->Reg[ra_idx]); + } + + ARMul_AddOverflowQ(state, product1, product2); } - // SMLSD + // SMUSD and SMLSD else { - state->Reg[rd_idx] = ((rn_lo * rm_lo) - (rn_hi * rm_hi)) + (s32)state->Reg[ra_idx]; + state->Reg[rd_idx] = product1 - product2; + + if (BITS(12, 15) != 15) + state->Reg[rd_idx] += state->Reg[ra_idx]; } + return 1; } break; diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp index b31c0ea24..6774f8a74 100644 --- a/src/core/arm/interpreter/armsupp.cpp +++ b/src/core/arm/interpreter/armsupp.cpp @@ -444,6 +444,14 @@ ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result) ASSIGNV (AddOverflow (a, b, result)); } +/* Assigns the Q flag if the given result is considered an overflow from the addition of a and b */ +void ARMul_AddOverflowQ(ARMul_State* state, ARMword a, ARMword b) +{ + u32 result = a + b; + if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0) + SETQ; +} + /* Assigns the C flag after an subtraction of a and b to give result. */ void diff --git a/src/core/arm/skyeye_common/armemu.h b/src/core/arm/skyeye_common/armemu.h index e1b286f0f..3ea14b5a3 100644 --- a/src/core/arm/skyeye_common/armemu.h +++ b/src/core/arm/skyeye_common/armemu.h @@ -602,6 +602,7 @@ extern ARMword ARMul_SwitchMode (ARMul_State *, ARMword, ARMword); extern void ARMul_MSRCpsr (ARMul_State *, ARMword, ARMword); extern void ARMul_SubOverflow (ARMul_State *, ARMword, ARMword, ARMword); extern void ARMul_AddOverflow (ARMul_State *, ARMword, ARMword, ARMword); +extern void ARMul_AddOverflowQ(ARMul_State*, ARMword, ARMword); extern void ARMul_SubCarry (ARMul_State *, ARMword, ARMword, ARMword); extern void ARMul_AddCarry (ARMul_State *, ARMword, ARMword, ARMword); extern tdstate ARMul_ThumbDecode (ARMul_State *, ARMword, ARMword, ARMword *); |