[PATCH 03/10] mpih-pow: harden condition calculation against branch optimization

[Jussi Kivilinna]

* mpi/mpih-pow.c (mont_reduc): Pass condition code through mask
generator to avoid optimization to branch by certain compilers.
--

Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
---
 mpi/mpih-pow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mpi/mpih-pow.c b/mpi/mpih-pow.c
index 649052f6..fb6cd9f3 100644
--- a/mpi/mpih-pow.c
+++ b/mpi/mpih-pow.c
@@ -97,7 +97,7 @@ mont_reduc (mpi_ptr_t rp, mpi_ptr_t tp,
 
   cy0 = _gcry_mpih_sub_n (rp, tp + n, mp, n);
   _gcry_mpih_set_cond (rp, tp + n, n,
-                       mpih_limb_is_not_zero (cy0)
+                       ct_ulong_gen_mask (mpih_limb_is_not_zero (cy0))
                        & mpih_limb_is_zero (cy1));
 }
 
-- 
2.48.1