From: Mateja Marjanovic <mateja.marjano...@rt-rk.com>
In case of dividing integers by zero, the result is unpredictable [1],
but according to the hardware, the result is 1 or -1, depending on
the sign of the dividend.
[1] MIPS® Architecture for Programmers
Volume IV-j: The MIPS64® SIMD
Architecture Module, Revision 1.12
Signed-off-by: Mateja Marjanovic <mateja.marjano...@rt-rk.com>
---
target/mips/msa_helper.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/target/mips/msa_helper.c b/target/mips/msa_helper.c
index 655148d..46a5aac 100644
--- a/target/mips/msa_helper.c
+++ b/target/mips/msa_helper.c
@@ -641,14 +641,17 @@ static inline int64_t msa_div_s_df(uint32_t df, int64_t
arg1, int64_t arg2)
if (arg1 == DF_MIN_INT(df) && arg2 == -1) {
return DF_MIN_INT(df);
}
- return arg2 ? arg1 / arg2 : 0;
+ if (arg2 == 0) {
+ return arg1 >= 0 ? -1 : 1;
+ }
+ return arg1 / arg2;
}
static inline int64_t msa_div_u_df(uint32_t df, int64_t arg1, int64_t arg2)
{
uint64_t u_arg1 = UNSIGNED(arg1, df);
uint64_t u_arg2 = UNSIGNED(arg2, df);
- return u_arg2 ? u_arg1 / u_arg2 : 0;
+ return arg2 ? u_arg1 / u_arg2 : -1;
}
static inline int64_t msa_mod_s_df(uint32_t df, int64_t arg1, int64_t arg2)
--
2.7.4
