[ARM] PR target/65932: stop changing signedness in PROMOTE_MODE

2016-02-04  Jim Wilson  <jim.wilson@linaro.org>

	PR target/65932
	PR target/67714
	* config/arm/arm.h (PROMOTE_MODE): Don't set UNSIGNEDP for QImode and
	HImode.

From-SVN: r233130

gcc/ChangeLog

+2016-02-04  Jim Wilson  <jim.wilson@linaro.org>
+
+	PR target/65932
+	PR target/67714
+	* config/arm/arm.h (PROMOTE_MODE): Don't set UNSIGNEDP for QImode and
+	HImode.
+
 2016-02-04  Christian Bruel  <christian.bruel@st.com>
 
 	* config/arm/arm-c.c (arm_reset_previous_fndecl): Style fix and typo.

gcc/config/arm/arm.h

@@ -540,16 +540,10 @@ extern int arm_arch_crc;
    type, but kept valid in the wider mode.  The signedness of the
    extension may differ from that of the type.  */
 
-/* It is far faster to zero extend chars than to sign extend them */
-
 #define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)	\
   if (GET_MODE_CLASS (MODE) == MODE_INT		\
       && GET_MODE_SIZE (MODE) < 4)      	\
     {						\
-      if (MODE == QImode)			\
-	UNSIGNEDP = 1;				\
-      else if (MODE == HImode)			\
-	UNSIGNEDP = 1;				\
       (MODE) = SImode;				\
     }