re PR target/65871 (bzhi builtin/intrinsic wrongly assumes bzhi instruction…

re PR target/65871 (bzhi builtin/intrinsic wrongly assumes bzhi instruction doesn't set the ZF flag)

	PR target/65871
        * config/i386/i386.md (*bmi_bextr_<mode>_cczonly): New pattern.
        (*bmi2_bzhi_<mode>3_1_cczonly): Ditto.
        (setcc+movzbl peephole2): Check also clobbered reg.
        (setcc+andl peephole2): Ditto.

From-SVN: r222592

gcc/ChangeLog

@@ -8,6 +8,8 @@
 	PR target/65871
 	* config/i386/i386.md (*bmi_bextr_<mode>_cczonly): New pattern.
 	(*bmi2_bzhi_<mode>3_1_cczonly): Ditto.
+	(setcc+movzbl peephole2): Check also clobbered reg.
+	(setcc+andl peephole2): Ditto.
 
 2015-04-29  Thomas Schwinge  <thomas@codesourcery.com>
 

gcc/config/i386/i386.md

@@ -11567,7 +11567,9 @@
 	(zero_extend (match_dup 1)))]
   "(peep2_reg_dead_p (3, operands[1])
     || operands_match_p (operands[1], operands[3]))
-   && ! reg_overlap_mentioned_p (operands[3], operands[0])"
+   && ! reg_overlap_mentioned_p (operands[3], operands[0])
+   && ! (GET_CODE (operands[4]) == CLOBBER
+	 && reg_mentioned_p (operands[3], operands[4]))"
   [(parallel [(set (match_dup 5) (match_dup 0))
 	      (match_dup 4)])
    (set (strict_low_part (match_dup 6))
@@ -11610,7 +11612,9 @@
 	      (clobber (reg:CC FLAGS_REG))])]
   "(peep2_reg_dead_p (3, operands[1])
     || operands_match_p (operands[1], operands[3]))
-   && ! reg_overlap_mentioned_p (operands[3], operands[0])"
+   && ! reg_overlap_mentioned_p (operands[3], operands[0])
+   && ! (GET_CODE (operands[4]) == CLOBBER
+	 && reg_mentioned_p (operands[3], operands[4]))"
   [(parallel [(set (match_dup 5) (match_dup 0))
 	      (match_dup 4)])
    (set (strict_low_part (match_dup 6))