[AArch64] Restore recog state after finding pre-madd instruction

	* config/aarch64/aarch64.c (aarch64_madd_needs_nop): Restore
	recog state after aarch64_prev_real_insn call.

	* gcc.target/aarch64/madd_after_asm_1.c: New test.

From-SVN: r216852

gcc/ChangeLog

 2014-10-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	* config/aarch64/aarch64.c (aarch64_madd_needs_nop): Restore
+	recog state after aarch64_prev_real_insn call.
+
+2014-10-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* config/aarch64/aarch64.h (MACHMODE): Add 'enum' to machine_mode.
 
 2014-10-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

gcc/config/aarch64/aarch64.c

@@ -7770,6 +7770,10 @@ aarch64_madd_needs_nop (rtx_insn* insn)
     return false;
 
   prev = aarch64_prev_real_insn (insn);
+  /* aarch64_prev_real_insn can call recog_memoized on insns other than INSN.
+     Restore recog state to INSN to avoid state corruption.  */
+  extract_constrain_insn_cached (insn);
+
   if (!prev || !has_memory_op (prev))
     return false;
 

gcc/testsuite/ChangeLog

+2014-10-29  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* gcc.target/aarch64/madd_after_asm_1.c: New test.
+
 2014-10-29  DJ Delorie  <dj@redhat.com>
 
 	* gcc.dg/20141029-1.c: New.

gcc/testsuite/gcc.target/aarch64/madd_after_asm_1.c

+/* { dg-do assemble } */
+/* { dg-options "-O2 -mfix-cortex-a53-835769" } */
+
+int
+test (int a, double b, int c, int d, int e)
+{
+  double result;
+  __asm__ __volatile ("// %0, %1"
+                      : "=w" (result)
+                      : "0" (b)
+                      :    /* No clobbers */
+                      );
+  return c * d + e;
+}