* mpi/mpih-const-time.c (_gcry_mpih_cmp_ui): Avoid conditional
branches for return value selection.
--
Signed-off-by: Jussi Kivilinna <jussi.kivili...@iki.fi>
---
mpi/mpih-const-time.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)
diff --git a/mpi/mpih-const-time.c b/mpi/mpih-const-time.c
index e684b956..d8b66c46 100644
--- a/mpi/mpih-const-time.c
+++ b/mpi/mpih-const-time.c
@@ -222,20 +222,15 @@ _gcry_mpih_mod_lli (mpi_ptr_t vp, mpi_size_t vsize,
int
_gcry_mpih_cmp_ui (mpi_ptr_t up, mpi_size_t usize, unsigned long v)
{
- int is_all_zero = 1;
+ unsigned long is_all_zero = ct_ulong_gen_mask(1);
+ int cmp0;
mpi_size_t i;
+ cmp0 = -mpih_ct_limb_less_than (up[0], v);
+ cmp0 |= mpih_ct_limb_greater_than (up[0], v);
+
for (i = 1; i < usize; i++)
- is_all_zero &= mpih_limb_is_zero (up[i]);
+ is_all_zero &= ct_ulong_gen_mask(mpih_limb_is_zero (up[i]));
- if (is_all_zero)
- {
- if (up[0] < v)
- return -1;
- else if (up[0] > v)
- return 1;
- else
- return 0;
- }
- return 1;
+ return cmp0 & (int)is_all_zero;
}
--
2.45.2
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