diff options
Diffstat (limited to 'target-mips/dsp_helper.c')
| -rw-r--r-- | target-mips/dsp_helper.c | 90 |
1 files changed, 48 insertions, 42 deletions
diff --git a/target-mips/dsp_helper.c b/target-mips/dsp_helper.c index 841f47b91d..ffa9396c4b 100644 --- a/target-mips/dsp_helper.c +++ b/target-mips/dsp_helper.c @@ -44,7 +44,8 @@ typedef union { /*** MIPS DSP internal functions begin ***/ #define MIPSDSP_ABS(x) (((x) >= 0) ? x : -x) -#define MIPSDSP_OVERFLOW(a, b, c, d) (!(!((a ^ b ^ -1) & (a ^ c) & d))) +#define MIPSDSP_OVERFLOW_ADD(a, b, c, d) (~(a ^ b) & (a ^ c) & d) +#define MIPSDSP_OVERFLOW_SUB(a, b, c, d) ((a ^ b) & (a ^ c) & d) static inline void set_DSPControl_overflow_flag(uint32_t flag, int position, CPUMIPSState *env) @@ -142,7 +143,7 @@ static inline int16_t mipsdsp_add_i16(int16_t a, int16_t b, CPUMIPSState *env) tempI = a + b; - if (MIPSDSP_OVERFLOW(a, b, tempI, 0x8000)) { + if (MIPSDSP_OVERFLOW_ADD(a, b, tempI, 0x8000)) { set_DSPControl_overflow_flag(1, 20, env); } @@ -156,7 +157,7 @@ static inline int16_t mipsdsp_sat_add_i16(int16_t a, int16_t b, tempS = a + b; - if (MIPSDSP_OVERFLOW(a, b, tempS, 0x8000)) { + if (MIPSDSP_OVERFLOW_ADD(a, b, tempS, 0x8000)) { if (a > 0) { tempS = 0x7FFF; } else { @@ -175,7 +176,7 @@ static inline int32_t mipsdsp_sat_add_i32(int32_t a, int32_t b, tempI = a + b; - if (MIPSDSP_OVERFLOW(a, b, tempI, 0x80000000)) { + if (MIPSDSP_OVERFLOW_ADD(a, b, tempI, 0x80000000)) { if (a > 0) { tempI = 0x7FFFFFFF; } else { @@ -858,7 +859,7 @@ static inline uint16_t mipsdsp_sub_i16(int16_t a, int16_t b, CPUMIPSState *env) int16_t temp; temp = a - b; - if (MIPSDSP_OVERFLOW(a, -b, temp, 0x8000)) { + if (MIPSDSP_OVERFLOW_SUB(a, b, temp, 0x8000)) { set_DSPControl_overflow_flag(1, 20, env); } @@ -871,8 +872,8 @@ static inline uint16_t mipsdsp_sat16_sub(int16_t a, int16_t b, int16_t temp; temp = a - b; - if (MIPSDSP_OVERFLOW(a, -b, temp, 0x8000)) { - if (a > 0) { + if (MIPSDSP_OVERFLOW_SUB(a, b, temp, 0x8000)) { + if (a >= 0) { temp = 0x7FFF; } else { temp = 0x8000; @@ -889,8 +890,8 @@ static inline uint32_t mipsdsp_sat32_sub(int32_t a, int32_t b, int32_t temp; temp = a - b; - if (MIPSDSP_OVERFLOW(a, -b, temp, 0x80000000)) { - if (a > 0) { + if (MIPSDSP_OVERFLOW_SUB(a, b, temp, 0x80000000)) { + if (a >= 0) { temp = 0x7FFFFFFF; } else { temp = 0x80000000; @@ -1004,7 +1005,7 @@ static inline uint32_t mipsdsp_sub32(int32_t a, int32_t b, CPUMIPSState *env) int32_t temp; temp = a - b; - if (MIPSDSP_OVERFLOW(a, -b, temp, 0x80000000)) { + if (MIPSDSP_OVERFLOW_SUB(a, b, temp, 0x80000000)) { set_DSPControl_overflow_flag(1, 20, env); } @@ -1017,7 +1018,7 @@ static inline int32_t mipsdsp_add_i32(int32_t a, int32_t b, CPUMIPSState *env) temp = a + b; - if (MIPSDSP_OVERFLOW(a, b, temp, 0x80000000)) { + if (MIPSDSP_OVERFLOW_ADD(a, b, temp, 0x80000000)) { set_DSPControl_overflow_flag(1, 20, env); } @@ -2488,37 +2489,42 @@ DP_QH(dpsq_s_w_qh, 0, 1); #endif #define DP_L_W(name, is_add) \ -void helper_##name(uint32_t ac, target_ulong rs, target_ulong rt, \ - CPUMIPSState *env) \ -{ \ - int32_t temp63; \ - int64_t dotp, acc; \ - uint64_t temp; \ - \ - dotp = mipsdsp_mul_q31_q31(ac, rs, rt, env); \ - acc = ((uint64_t)env->active_tc.HI[ac] << 32) | \ - ((uint64_t)env->active_tc.LO[ac] & MIPSDSP_LLO); \ - if (!is_add) { \ - dotp = -dotp; \ - } \ - \ - temp = acc + dotp; \ - if (MIPSDSP_OVERFLOW((uint64_t)acc, (uint64_t)dotp, temp, \ - (0x01ull << 63))) { \ - temp63 = (temp >> 63) & 0x01; \ - if (temp63 == 1) { \ - temp = (0x01ull << 63) - 1; \ - } else { \ - temp = 0x01ull << 63; \ - } \ - \ - set_DSPControl_overflow_flag(1, 16 + ac, env); \ - } \ - \ - env->active_tc.HI[ac] = (target_long)(int32_t) \ - ((temp & MIPSDSP_LHI) >> 32); \ - env->active_tc.LO[ac] = (target_long)(int32_t) \ - (temp & MIPSDSP_LLO); \ +void helper_##name(uint32_t ac, target_ulong rs, target_ulong rt, \ + CPUMIPSState *env) \ +{ \ + int32_t temp63; \ + int64_t dotp, acc; \ + uint64_t temp; \ + bool overflow; \ + \ + dotp = mipsdsp_mul_q31_q31(ac, rs, rt, env); \ + acc = ((uint64_t)env->active_tc.HI[ac] << 32) | \ + ((uint64_t)env->active_tc.LO[ac] & MIPSDSP_LLO); \ + if (is_add) { \ + temp = acc + dotp; \ + overflow = MIPSDSP_OVERFLOW_ADD((uint64_t)acc, (uint64_t)dotp, \ + temp, (0x01ull << 63)); \ + } else { \ + temp = acc - dotp; \ + overflow = MIPSDSP_OVERFLOW_SUB((uint64_t)acc, (uint64_t)dotp, \ + temp, (0x01ull << 63)); \ + } \ + \ + if (overflow) { \ + temp63 = (temp >> 63) & 0x01; \ + if (temp63 == 1) { \ + temp = (0x01ull << 63) - 1; \ + } else { \ + temp = 0x01ull << 63; \ + } \ + \ + set_DSPControl_overflow_flag(1, 16 + ac, env); \ + } \ + \ + env->active_tc.HI[ac] = (target_long)(int32_t) \ + ((temp & MIPSDSP_LHI) >> 32); \ + env->active_tc.LO[ac] = (target_long)(int32_t) \ + (temp & MIPSDSP_LLO); \ } DP_L_W(dpaq_sa_l_w, 1); |