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-rw-r--r--target-mips/dsp_helper.c16
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,