re PR target/64479 ([SH] wrong optimization delayed-branch)

gcc/
	PR target/64479
	* rtlanal.c (set_reg_p): Handle SEQUENCE constructs.

From-SVN: r219506

gcc/ChangeLog

+2015-01-13  Oleg Endo  <olegendo@gcc.gnu.org>
+
+	PR target/64479
+	* rtlanal.c (set_reg_p): Handle SEQUENCE constructs.
+
 2015-01-12  Kaz Kojima  <kkojima@gcc.gnu.org>
 
 	* config/sh/sh.c (sh_atomic_assign_expand_fenv): New function.

gcc/rtlanal.c

@@ -1000,6 +1000,17 @@ reg_set_between_p (const_rtx reg, const rtx_insn *from_insn,
 int
 reg_set_p (const_rtx reg, const_rtx insn)
 {
+  /* After delay slot handling, call and branch insns might be in a
+     sequence.  Check all the elements there.  */
+  if (INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
+    {
+      for (int i = 0; i < XVECLEN (PATTERN (insn), 0); ++i)
+	if (reg_set_p (reg, XVECEXP (PATTERN (insn), 0, i)))
+	  return true;
+
+      return false;
+    }
+
   /* We can be passed an insn or part of one.  If we are passed an insn,
      check if a side-effect of the insn clobbers REG.  */
   if (INSN_P (insn)
@@ -1011,7 +1022,7 @@ reg_set_p (const_rtx reg, const_rtx insn)
 					       GET_MODE (reg), REGNO (reg)))
 		  || MEM_P (reg)
 		  || find_reg_fusage (insn, CLOBBER, reg)))))
-    return 1;
+    return true;
 
   return set_of (reg, insn) != NULL_RTX;
 }