Restrict a VSX extract to TARGET_POWERPC64 (PR88213)

This pattern optimises a scalar extract from a vector loaded from
memory to be just a scalar load from memory.  But to do a 64-bit
integer load you need 64-bit integer registers, which needs
TARGET_POWERPC64.


	PR target/88213
	* config/rs6000/vsx.md (*vsx_extract_<P:mode>_<VSX_D:mode>_load):
	Require TARGET_POWERPC64.

From-SVN: r267263

gcc/ChangeLog

+2018-12-19  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/88213
+	* config/rs6000/vsx.md (*vsx_extract_<P:mode>_<VSX_D:mode>_load):
+	Require TARGET_POWERPC64.
+
 2018-12-19  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/88533

gcc/config/rs6000/vsx.md

@@ -3257,7 +3257,7 @@
 	 (match_operand:VSX_D 1 "memory_operand" "m,m")
 	 (parallel [(match_operand:QI 2 "const_0_to_1_operand" "n,n")])))
    (clobber (match_scratch:P 3 "=&b,&b"))]
-  "VECTOR_MEM_VSX_P (<VSX_D:MODE>mode)"
+  "TARGET_POWERPC64 && VECTOR_MEM_VSX_P (<VSX_D:MODE>mode)"
   "#"
   "&& reload_completed"
   [(set (match_dup 0) (match_dup 4))]