Fix abs not to use powerpc instructions on -mcpu=common

From-SVN: r9569

gcc/config/rs6000/rs6000.md

@@ -1044,7 +1044,12 @@
 	(abs:SI (match_operand:SI 1 "gpc_reg_operand" "r,0")))
    (clobber (match_scratch:SI 2 "=&r,&r"))]
   "!TARGET_POWER"
-  "{srai|srawi} %2,%1,31\;xor %0,%2,%1\;subf %0,%2,%0"
+  "*
+{
+  return (TARGET_POWERPC)
+    ? \"{srai|srawi} %2,%1,31\;xor %0,%2,%1\;subf %0,%2,%0\"
+    : \"{srai|srawi} %2,%1,31\;xor %0,%2,%1\;{sf|subfc} %0,%2,%0\";
+}"
   [(set_attr "length" "12")])
 
 (define_split
@@ -1068,7 +1073,12 @@
 	(neg:SI (abs:SI (match_operand:SI 1 "gpc_reg_operand" "r,0"))))
    (clobber (match_scratch:SI 2 "=&r,&r"))]
   "!TARGET_POWER"
-  "{srai|srawi} %2,%1,31\;xor %0,%2,%1\;subf %0,%0,%2"
+  "*
+{
+  return (TARGET_POWERPC)
+    ? \"{srai|srawi} %2,%1,31\;xor %0,%2,%1\;subf %0,%0,%2\"
+    : \"{srai|srawi} %2,%1,31\;xor %0,%2,%1\;{sf|subfc} %0,%0,%2\";
+}"
   [(set_attr "length" "12")])
 
 (define_split