re PR tree-optimization/35642 (short * short multiplication not vectorized on Power)

	PR tree-optimization/35642
	* config/rs6000/altivec.md (mulv8hi3): Implement.


Co-Authored-By: Ira Rosen <irar@il.ibm.com>

From-SVN: r140083

gcc/ChangeLog

+2008-09-07  Dorit Nuzman  <dorit@il.ibm.com>
+            Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/35642
+	* config/rs6000/altivec.md (mulv8hi3): Implement.
+
 2008-09-06  Jeff Law <law@redhat.com>
 
 	* h8300.h (IRA_COVER_CLASSES): Define.

gcc/config/rs6000/altivec.md

@@ -647,6 +647,28 @@
    DONE;
  }")
  
+(define_expand "mulv8hi3"
+  [(use (match_operand:V8HI 0 "register_operand" ""))
+   (use (match_operand:V8HI 1 "register_operand" ""))
+   (use (match_operand:V8HI 2 "register_operand" ""))]
+   "TARGET_ALTIVEC"
+   "
+{
+   rtx odd = gen_reg_rtx (V4SImode);
+   rtx even = gen_reg_rtx (V4SImode);
+   rtx high = gen_reg_rtx (V4SImode);
+   rtx low = gen_reg_rtx (V4SImode);
+
+   emit_insn (gen_altivec_vmulesh (even, operands[1], operands[2]));
+   emit_insn (gen_altivec_vmulosh (odd, operands[1], operands[2]));
+
+   emit_insn (gen_altivec_vmrghw (high, even, odd));
+   emit_insn (gen_altivec_vmrglw (low, even, odd));
+
+   emit_insn (gen_altivec_vpkuwum (operands[0], high, low));
+
+   DONE;
+}")
 
 ;; Fused multiply subtract 
 (define_insn "altivec_vnmsubfp"

gcc/testsuite/ChangeLog

+2008-09-07  Dorit Nuzman  <dorit@il.ibm.com>
+            Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/35642
+	* lib/target-supports.exp (check_effective_target_vect_short_mult):
+	Add powerpc.
+
 2008-09-07  Victor Kaplansky  <victork@il.ibm.com>
 
 	PR testsuite/37334

gcc/testsuite/lib/target-supports.exp

@@ -2093,7 +2093,8 @@ proc check_effective_target_vect_short_mult { } {
 	if { [istarget ia64-*-*]
 	     || [istarget spu-*-*]
 	     || [istarget i?86-*-*]
-	     || [istarget x86_64-*-*] } {
+	     || [istarget x86_64-*-*] 
+             || [istarget powerpc*-*-*] } {
 	   set et_vect_short_mult_saved 1
 	}
     }