diff options
Diffstat (limited to 'target-mips')
| -rw-r--r-- | target-mips/dsp_helper.c | 30 |
1 files changed, 6 insertions, 24 deletions
diff --git a/target-mips/dsp_helper.c b/target-mips/dsp_helper.c index f975da08c4..805247d252 100644 --- a/target-mips/dsp_helper.c +++ b/target-mips/dsp_helper.c @@ -682,49 +682,31 @@ static inline uint8_t mipsdsp_sat8_reduce_precision(uint16_t a, static inline uint8_t mipsdsp_lshift8(uint8_t a, uint8_t s, CPUMIPSState *env) { - uint8_t sign; uint8_t discard; - if (s == 0) { - return a; - } else { - sign = (a >> 7) & 0x01; - if (sign != 0) { - discard = (((0x01 << (8 - s)) - 1) << s) | - ((a >> (6 - (s - 1))) & ((0x01 << s) - 1)); - } else { - discard = a >> (6 - (s - 1)); - } + if (s != 0) { + discard = a >> (8 - s); if (discard != 0x00) { set_DSPControl_overflow_flag(1, 22, env); } - return a << s; } + return a << s; } static inline uint16_t mipsdsp_lshift16(uint16_t a, uint8_t s, CPUMIPSState *env) { - uint8_t sign; uint16_t discard; - if (s == 0) { - return a; - } else { - sign = (a >> 15) & 0x01; - if (sign != 0) { - discard = (((0x01 << (16 - s)) - 1) << s) | - ((a >> (14 - (s - 1))) & ((0x01 << s) - 1)); - } else { - discard = a >> (14 - (s - 1)); - } + if (s != 0) { + discard = (int16_t)a >> (15 - s); if ((discard != 0x0000) && (discard != 0xFFFF)) { set_DSPControl_overflow_flag(1, 22, env); } - return a << s; } + return a << s; } |