X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_nist.c;h=a5e07acd851a8d77b35f7af5418117bcbd1b6093;hp=edd06a9a0e51df72f69c229039ee744605aab3c8;hb=323154be3326a329f768958e9229585a84985747;hpb=7c4776251e283db7bdaeb416f1d99b78cd622e7a

diff --git a/crypto/bn/bn_nist.c b/crypto/bn/bn_nist.c
index edd06a9a0e..a5e07acd85 100644
--- a/crypto/bn/bn_nist.c
+++ b/crypto/bn/bn_nist.c
@@ -1108,9 +1108,20 @@ int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
 	/* ... and right shift */
 	for (val=t_d[0],i=0; i<BN_NIST_521_TOP-1; i++)
 		{
+#if 0
+		/*
+		 * MSC ARM compiler [version 2013, presumably even earlier,
+		 * much earlier] miscompiles this code, but not one in
+		 * #else section. See RT#3541.
+		 */
+		tmp = val>>BN_NIST_521_RSHIFT;
+		val = t_d[i+1];
+		t_d[i] = (tmp | val<<BN_NIST_521_LSHIFT) & BN_MASK2;
+#else
 		t_d[i] = ( val>>BN_NIST_521_RSHIFT |
 			  (tmp=t_d[i+1])<<BN_NIST_521_LSHIFT ) & BN_MASK2;
 		val=tmp;
+#endif
 		}
 	t_d[i] = val>>BN_NIST_521_RSHIFT;
 	/* lower 521 bits */