mips-dspr2.md (mips_prepend): Mask operand 3 rather than operand 2.

gcc/
2012-02-02  Jia Liu  <proljc@gmail.com>

	* config/mips/mips-dspr2.md (mips_prepend): Mask operand 3 rather
	than operand 2.

gcc/testsuite/
	* gcc.target/mips/mips-prepend-1.c: New test.

From-SVN: r183841

gcc/ChangeLog

+2012-02-02  Jia Liu  <proljc@gmail.com>
+
+	* config/mips/mips-dspr2.md (mips_prepend): Mask operand 3 rather
+	than operand 2.
+
 2012-02-02 Jan Hubicka  <jh@suse.cz>
 	   Tom de Vries  <tom@codesourcery.com>
 

gcc/config/mips/mips-dspr2.md

@@ -353,7 +353,7 @@
   "ISA_HAS_DSPR2"
 {
   if (INTVAL (operands[3]) & ~(unsigned HOST_WIDE_INT) 31)
-    operands[2] = GEN_INT (INTVAL (operands[2]) & 31);
+    operands[3] = GEN_INT (INTVAL (operands[3]) & 31);
   return "prepend\t%0,%z2,%3";
 }
   [(set_attr "type"	"arith")

gcc/testsuite/ChangeLog

+2012-02-02  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	* gcc.target/mips/mips-prepend-1.c: New test.
+
 2012-02-02 Jan Hubicka  <jh@suse.cz>
 	   Tom de Vries  <tom@codesourcery.com>
 

gcc/testsuite/gcc.target/mips/mips-prepend-1.c

+/* { dg-options "-mdspr2" } */
+/* { dg-final { scan-assembler "prepend\[^\n\]*,10" } } */
+
+NOMIPS16 int
+foo (int x, int y)
+{
+  return __builtin_mips_prepend (x, y, 42);
+}