[backport from gcc-4.8/trunk r185202 <mikpe@it.uu.se>]

Date: Thu, 08 Mar 2012 16:36:30 +1300
From: Michael Hope <michael dot hope at linaro dot org>
Subject: [PATCH, ARM, libgcc] Enable longlong.h inline assembly for Thumb-2
List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>

Hi there,

This patch enables the ARM inline assembly 64 bit add, subtract, and multiply instructions
in libgcc when compiling for Thumb-2.  The existing code enables them for ARM mode as
Thumb-1 is missing the encodings.

OK for 4.8?

-- Michael

libgcc/

2012-03-11  Michael Hope  <michael.hope@linaro.org>

       * longlong.h [ARM] (add_ssaaaa, sub_ddmmss, umul_ppmm): Enable
       for Thumb-2.

--- gcc-4.6.3/gcc/longlong.h.~1~	2011-10-04 09:28:50.000000000 +0200
+++ gcc-4.6.3/gcc/longlong.h	2012-06-10 14:04:14.000000000 +0200
@@ -203,7 +203,8 @@ do {									\
 UDItype __umulsidi3 (USItype, USItype);
 #endif
 
-#if defined (__arm__) && !defined (__thumb__) && W_TYPE_SIZE == 32
+#if defined (__arm__) && (defined (__thumb2__) || !defined (__thumb__)) \
+ && W_TYPE_SIZE == 32
 #define add_ssaaaa(sh, sl, ah, al, bh, bl) \
   __asm__ ("adds	%1, %4, %5\n\tadc	%0, %2, %3"		\
 	   : "=r" ((USItype) (sh)),					\