Fix spe.md movv4hi_internal

[Joseph S. Myers]

This patch fixes ICEs on gcc.c-torture/execute/20050604-1.c on 
powerpc-none-linux-gnuspe --enable-e500_double, all levels apart from -O0, 
by adding an alternative for loading easy vector constants (which here 
means just 0) to movv4hi_internal, like that in movv2si_internal, 
movv1di_internal and movv2sf_internal.

Tested with no regressions, crosses to powerpc-none-linux-gnuspe.  OK to 
commit to mainline, 4.2 and 4.1?

Note: there's also an execution failure of this test at -O0 only, both 
before and after this patch, which would appear to be a separate bug.  
After this patch all the higher optimization levels (which previously had 
an ICE) pass the execution test.

2006-11-17  Joseph Myers  <joseph@codesourcery.com>

	* config/rs6000/spe.md (movv4hi_internal): Add alternative for
	easy vector constant loads.

Index: spe.md
===================================================================
--- spe.md	(revision 118940)
+++ spe.md	(working copy)
@@ -2392,15 +2392,16 @@
   "{ rs6000_emit_move (operands[0], operands[1], V4HImode); DONE; }")
 
 (define_insn "*movv4hi_internal"
-  [(set (match_operand:V4HI 0 "nonimmediate_operand" "=m,r,r")
-	(match_operand:V4HI 1 "input_operand" "r,m,r"))]
+  [(set (match_operand:V4HI 0 "nonimmediate_operand" "=m,r,r,r")
+	(match_operand:V4HI 1 "input_operand" "r,m,r,W"))]
   "TARGET_SPE
    && (gpc_reg_operand (operands[0], V4HImode)
        || gpc_reg_operand (operands[1], V4HImode))"
   "@
    evstdd%X0 %1,%y0
    evldd%X1 %0,%y1
-   evor %0,%1,%1"
+   evor %0,%1,%1
+   evxor %0,%0,%0"
   [(set_attr "type" "vecload")])
 
 (define_expand "movv2sf"

-- 
Joseph S. Myers
joseph@codesourcery.com