diff options
Diffstat (limited to 'target-mips')
| -rw-r--r-- | target-mips/dsp_helper.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/target-mips/dsp_helper.c b/target-mips/dsp_helper.c index c718a786e1..93f5d9e023 100644 --- a/target-mips/dsp_helper.c +++ b/target-mips/dsp_helper.c @@ -648,16 +648,22 @@ static inline int32_t mipsdsp_sat16_mul_q15_q15(uint16_t a, uint16_t b, static inline uint16_t mipsdsp_trunc16_sat16_round(int32_t a, CPUMIPSState *env) { - int64_t temp; + uint16_t temp; - temp = (int32_t)a + 0x00008000; - if (a > (int)0x7fff8000) { - temp = 0x7FFFFFFF; + /* + * The value 0x00008000 will be added to the input Q31 value, and the code + * needs to check if the addition causes an overflow. Since a positive value + * is added, overflow can happen in one direction only. + */ + if (a > 0x7FFF7FFF) { + temp = 0x7FFF; set_DSPControl_overflow_flag(1, 22, env); + } else { + temp = ((a + 0x8000) >> 16) & 0xFFFF; } - return (temp >> 16) & 0xFFFF; + return temp; } static inline uint8_t mipsdsp_sat8_reduce_precision(uint16_t a, |