[ARM] PR target/79145 Fix xordi3 expander for immediate operands in iWMMXt

	PR target/79145
	* config/arm/arm.md (xordi3): Force constant operand into a register
	for TARGET_IWMMXT.

	* gcc.target/arm/pr79145.c: New test.

From-SVN: r244894

gcc/ChangeLog

 2016-01-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	PR target/79145
+	* config/arm/arm.md (xordi3): Force constant operand into a register
+	for TARGET_IWMMXT.
+
+2016-01-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* doc/invoke.texi (-fstore-merging): Correct default optimization
 	levels at which it is enabled.
 	(-O): Move -fstore-merging from list to...

gcc/config/arm/arm.md

@@ -3313,7 +3313,14 @@
 	(xor:DI (match_operand:DI 1 "s_register_operand" "")
 		(match_operand:DI 2 "arm_xordi_operand" "")))]
   "TARGET_32BIT"
-  ""
+  {
+    /* The iWMMXt pattern for xordi3 accepts only register operands but we want
+       to reuse this expander for all TARGET_32BIT targets so just force the
+       constants into a register.  Unlike for the anddi3 and iordi3 there are
+       no NEON instructions that take an immediate.  */
+    if (TARGET_IWMMXT && !REG_P (operands[2]))
+      operands[2] = force_reg (DImode, operands[2]);
+  }
 )
 
 (define_insn_and_split "*xordi3_insn"

gcc/testsuite/ChangeLog

+2016-01-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/79145
+	* gcc.target/arm/pr79145.c: New test.
+
 2017-01-25  Richard Biener  <rguenther@suse.de>
 
 	PR debug/78363

gcc/testsuite/gcc.target/arm/pr79145.c

+/* { dg-do compile } */
+/* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-mcpu=*" } { "-mcpu=iwmmxt" } } */
+/* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-mabi=*" } { "-mabi=iwmmxt" } } */
+/* { dg-skip-if "Test is specific to the iWMMXt" { arm*-*-* } { "-march=*" } { "-march=iwmmxt" } } */
+/* { dg-skip-if "Test is specific to ARM mode" { arm*-*-* } { "-mthumb" } { "" } } */
+/* { dg-require-effective-target arm32 } */
+/* { dg-require-effective-target arm_iwmmxt_ok } */
+/* { dg-options "-mcpu=iwmmxt" } */
+
+int
+main (void)
+{
+  volatile long long t1;
+  t1 ^= 0x55;
+  return 0;
+}