cse.c (cse_insn): Fix missing check for STRICT_LOW_PART and minor clean up.

gcc/ChangeLog:

2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* cse.c (cse_insn): Fix missing check for STRICT_LOW_PART and minor
	clean up.

From-SVN: r226134

gcc/ChangeLog

+2015-07-23  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	* cse.c (cse_insn): Fix missing check for STRICT_LOW_PART and minor
+	clean up.
+
 2015-07-23  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.c (ix86_build_builtin_va_list_64): Rename

gcc/cse.c

@@ -4529,10 +4529,10 @@ cse_insn (rtx_insn *insn)
      this case, and if it isn't set, then there will be no equivalence
      for the destination.  */
   if (n_sets == 1 && REG_NOTES (insn) != 0
-      && (tem = find_reg_note (insn, REG_EQUAL, NULL_RTX)) != 0)
+      && (tem = find_reg_note (insn, REG_EQUAL, NULL_RTX)) != 0
+      && (! rtx_equal_p (XEXP (tem, 0), SET_SRC (sets[0].rtl))))
     {
-      if ((! rtx_equal_p (XEXP (tem, 0), SET_SRC (sets[0].rtl)))
-	  || GET_CODE (SET_DEST (sets[0].rtl)) == STRICT_LOW_PART)
+      if (GET_CODE (SET_DEST (sets[0].rtl)) == STRICT_LOW_PART)
 	src_eqv = copy_rtx (XEXP (tem, 0));
 
       /* If DEST is of the form ZERO_EXTACT, as in:
@@ -4544,14 +4544,14 @@ cse_insn (rtx_insn *insn)
 	 point.  Note that this is different from SRC_EQV. We can however
 	 calculate SRC_EQV with the position and width of ZERO_EXTRACT.  */
       else if (GET_CODE (SET_DEST (sets[0].rtl)) == ZERO_EXTRACT
-	       && CONST_INT_P (src_eqv)
+	       && CONST_INT_P (XEXP (tem, 0))
 	       && CONST_INT_P (XEXP (SET_DEST (sets[0].rtl), 1))
 	       && CONST_INT_P (XEXP (SET_DEST (sets[0].rtl), 2)))
 	{
 	  rtx dest_reg = XEXP (SET_DEST (sets[0].rtl), 0);
 	  rtx width = XEXP (SET_DEST (sets[0].rtl), 1);
 	  rtx pos = XEXP (SET_DEST (sets[0].rtl), 2);
-	  HOST_WIDE_INT val = INTVAL (src_eqv);
+	  HOST_WIDE_INT val = INTVAL (XEXP (tem, 0));
 	  HOST_WIDE_INT mask;
 	  unsigned int shift;
 	  if (BITS_BIG_ENDIAN)