Reduce code size for exp_mod_get_window_size
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/library/bignum_core.c b/library/bignum_core.c
index 8bf819c..ae0b94a 100644
--- a/library/bignum_core.c
+++ b/library/bignum_core.c
@@ -686,16 +686,16 @@
static size_t exp_mod_get_window_size(size_t Ebits)
{
- size_t wsize = (Ebits > 671) ? 6 : (Ebits > 239) ? 5 :
- (Ebits > 79) ? 4 : 1;
-
-#if (MBEDTLS_MPI_WINDOW_SIZE < 6)
- if (wsize > MBEDTLS_MPI_WINDOW_SIZE) {
- wsize = MBEDTLS_MPI_WINDOW_SIZE;
- }
+#if MBEDTLS_MPI_WINDOW_SIZE >= 6
+ return (Ebits > 671) ? 6 : (Ebits > 239) ? 5 : (Ebits > 79) ? 4 : 1;
+#elif MBEDTLS_MPI_WINDOW_SIZE == 5
+ return (Ebits > 239) ? 5 : (Ebits > 79) ? 4 : 1;
+#elif MBEDTLS_MPI_WINDOW_SIZE > 1
+ return (Ebits > 79) ? MBEDTLS_MPI_WINDOW_SIZE : 1;
+#else
+ (void) Ebits;
+ return 1;
#endif
-
- return wsize;
}
size_t mbedtls_mpi_core_exp_mod_working_limbs(size_t AN_limbs, size_t E_limbs)