diff options
Diffstat (limited to 'src/core/arm')
| -rw-r--r-- | src/core/arm/dyncom/arm_dyncom_interpreter.cpp | 21 | ||||
| -rw-r--r-- | src/core/arm/interpreter/armsupp.cpp | 16 | ||||
| -rw-r--r-- | src/core/arm/skyeye_common/armdefs.h | 1 |
3 files changed, 26 insertions, 12 deletions
diff --git a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp index bf864c7a7..4c0a8f5cb 100644 --- a/src/core/arm/dyncom/arm_dyncom_interpreter.cpp +++ b/src/core/arm/dyncom/arm_dyncom_interpreter.cpp @@ -4003,16 +4003,13 @@ unsigned InterpreterMainLoop(ARMul_State* state) { } ADC_INST: { - adc_inst *inst_cream = (adc_inst *)inst_base->component; - if ((inst_base->cond == 0xe) || CondPassed(cpu, inst_base->cond)) { - u32 left = RN; - u32 right = SHIFTER_OPERAND; + if (inst_base->cond == 0xE || CondPassed(cpu, inst_base->cond)) { + adc_inst* const inst_cream = (adc_inst*)inst_base->component; - u64 unsigned_sum = (left + right + cpu->CFlag); - s64 signed_sum = (s64)(s32)left + (s64)(s32)right + (s64)cpu->CFlag; - u32 result = (unsigned_sum & 0xFFFFFFFF); + bool carry; + bool overflow; + RD = AddWithCarry(RN, SHIFTER_OPERAND, cpu->CFlag, &carry, &overflow); - RD = result; if (inst_cream->S && (inst_cream->Rd == 15)) { if (CurrentModeHasSPSR) { cpu->Cpsr = cpu->Spsr_copy; @@ -4020,10 +4017,10 @@ unsigned InterpreterMainLoop(ARMul_State* state) { LOAD_NZCVT; } } else if (inst_cream->S) { - UPDATE_NFLAG(result); - UPDATE_ZFLAG(result); - UPDATE_CFLAG_CARRY_FROM_ADD(left, right, cpu->CFlag); - cpu->VFlag = ((s64)(s32)result != signed_sum); + UPDATE_NFLAG(RD); + UPDATE_ZFLAG(RD); + cpu->CFlag = carry; + cpu->VFlag = overflow; } if (inst_cream->Rd == 15) { INC_PC(sizeof(adc_inst)); diff --git a/src/core/arm/interpreter/armsupp.cpp b/src/core/arm/interpreter/armsupp.cpp index 68ac2a0ce..e2626eefb 100644 --- a/src/core/arm/interpreter/armsupp.cpp +++ b/src/core/arm/interpreter/armsupp.cpp @@ -418,6 +418,22 @@ ARMul_NegZero (ARMul_State * state, ARMword result) } } +// Add with carry, indicates if a carry-out or signed overflow occurred. +u32 AddWithCarry(u32 left, u32 right, u32 carry_in, bool* carry_out_occurred, bool* overflow_occurred) +{ + u64 unsigned_sum = (u64)left + (u64)right + (u64)carry_in; + s64 signed_sum = (s64)(s32)left + (s64)(s32)right + (s64)carry_in; + u64 result = (unsigned_sum & 0xFFFFFFFF); + + if (carry_out_occurred) + *carry_out_occurred = (result != unsigned_sum); + + if (overflow_occurred) + *overflow_occurred = ((s64)(s32)result != signed_sum); + + return (u32)result; +} + // Compute whether an addition of A and B, giving RESULT, overflowed. bool AddOverflow(ARMword a, ARMword b, ARMword result) { diff --git a/src/core/arm/skyeye_common/armdefs.h b/src/core/arm/skyeye_common/armdefs.h index 1b2cef451..560b51a9f 100644 --- a/src/core/arm/skyeye_common/armdefs.h +++ b/src/core/arm/skyeye_common/armdefs.h @@ -795,6 +795,7 @@ extern void ARMul_FixSPSR(ARMul_State*, ARMword, ARMword); extern void ARMul_ConsolePrint(ARMul_State*, const char*, ...); extern void ARMul_SelectProcessor(ARMul_State*, unsigned); +extern u32 AddWithCarry(u32, u32, u32, bool*, bool*); extern bool ARMul_AddOverflowQ(ARMword, ARMword); extern u8 ARMul_SignedSaturatedAdd8(u8, u8); |