commit ae55707b2859ca1abf2d349213670283aeec59f0
author Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com> Mon Mar 20 12:21:24 2017 +0100
committer Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com> Wed Aug 09 11:44:53 2017 +0200
tree 347db149b6159c9495c4966de34563019d7a5b8e
parent e2d7cb3f10a5e19f0448f010c8bc4008679f143a

Turn double loop into single loop

In preparation for making the loop restartable

library/ecp.c

diff --git a/library/ecp.c b/library/ecp.c
index 2d473d9..5ee97c8 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -1359,12 +1359,15 @@
 
     MBEDTLS_MPI_CHK( mbedtls_ecp_copy( &T[0], P ) );
 
-    for( i = 1; i < T_len; i <<= 1 )
+    for( j = 0; j < d * ( w - 1 ); j++ )
     {
+        i = 1U << ( j / d );
         cur = T + i;
-        MBEDTLS_MPI_CHK( mbedtls_ecp_copy( cur, T + ( i >> 1 ) ) );
-        for( j = 0; j < d; j++ )
-            MBEDTLS_MPI_CHK( ecp_double_jac( grp, cur, cur ) );
+
+        if( j % d == 0 )
+            MBEDTLS_MPI_CHK( mbedtls_ecp_copy( cur, T + ( i >> 1 ) ) );
+
+        MBEDTLS_MPI_CHK( ecp_double_jac( grp, cur, cur ) );
     }
 
 #if defined(MBEDTLS_ECP_EARLY_RETURN)