From: Andy Polyakov <appro@openssl.org>
Date: Sat, 1 Sep 2012 13:17:32 +0000 (+0000)
Subject: bn_lcl.h: gcc removed support for "h" constraint, which broke inline
X-Git-Tag: master-post-reformat~1711
X-Git-Url: https://git.openssl.org/?p=openssl.git;a=commitdiff_plain;h=a58fdc7a346e717308984e2b6d22b1081d708b0a;hp=d21bf10dea6588b632a65b4fe594e04f288aad83

bn_lcl.h: gcc removed support for "h" constraint, which broke inline
assembler.
---

diff --git a/crypto/bn/bn_lcl.h b/crypto/bn/bn_lcl.h
index 74cea91c1c..64df27aaf9 100644
--- a/crypto/bn/bn_lcl.h
+++ b/crypto/bn/bn_lcl.h
@@ -300,16 +300,23 @@ extern "C" {
 #  endif
 # elif defined(__mips) && (defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG))
 #  if defined(__GNUC__) && __GNUC__>=2
-#   define BN_UMULT_HIGH(a,b)	({	\
+#   if __GNUC__>=4 && __GNUC_MINOR__>=4 /* "h" constraint is no more since 4.4 */
+#     define BN_UMULT_HIGH(a,b)		 (((__uint128_t)(a)*(b))>>64)
+#     define BN_UMULT_LOHI(low,high,a,b) ({	\
+	__uint128_t ret=(__uint128_t)(a)*(b);	\
+	(high)=ret>>64; (low)=ret;	 })
+#   else
+#     define BN_UMULT_HIGH(a,b)	({	\
 	register BN_ULONG ret;		\
 	asm ("dmultu	%1,%2"		\
 	     : "=h"(ret)		\
 	     : "r"(a), "r"(b) : "l");	\
 	ret;			})
-#   define BN_UMULT_LOHI(low,high,a,b)	\
+#     define BN_UMULT_LOHI(low,high,a,b)\
 	asm ("dmultu	%2,%3"		\
 	     : "=l"(low),"=h"(high)	\
 	     : "r"(a), "r"(b));
+#    endif
 #  endif
 # endif		/* cpu */
 #endif		/* OPENSSL_NO_ASM */