re PR regression/55754 (FAIL: gcc.target/arm/unsigned-extend-2.c scan-assembler ands)

2012-12-20  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	PR target/55754
	* config/arm/arm.c (arm_canonicalize_comparison): Remove
	op0_preserve_value check for zero_extend to and transformation.

From-SVN: r194636

gcc/ChangeLog

+2012-12-20  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	PR target/55754
+	* config/arm/arm.c (arm_canonicalize_comparison): Remove
+	op0_preserve_value check for zero_extend to and transformation.
+
 2012-12-20  Teresa Johnson  <tejohnson@google.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/config/arm/arm.c

@@ -3619,8 +3619,7 @@ arm_canonicalize_comparison (int *code, rtx *op0, rtx *op1,
   /* If *op0 is (zero_extend:SI (subreg:QI (reg:SI) 0)) and comparing
      with const0_rtx, change it to (and:SI (reg:SI) (const_int 255)),
      to facilitate possible combining with a cmp into 'ands'.  */
-  if (!op0_preserve_value
-      && mode == SImode
+  if (mode == SImode
       && GET_CODE (*op0) == ZERO_EXTEND
       && GET_CODE (XEXP (*op0, 0)) == SUBREG
       && GET_MODE (XEXP (*op0, 0)) == QImode