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[i386] : Use pow2p_hwi some more

Message ID CAFULd4be0gPFbvTs2RxZmDW_0-4vs8DmiEoUG7Pm4qiCeVzumw@mail.gmail.com
State New
Headers show

Commit Message

Uros Bizjak Sept. 20, 2016, 6 p.m. UTC 
2016-09-20  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (mult->ashift peephole2s): Use pow2p_hwi
    instead of exact_log2.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32} ,
committed to mainline SVN.

Uros.
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Patch

Index: config/i386/i386.md
===================================================================
--- config/i386/i386.md	(revision 240276)
+++ config/i386/i386.md	(working copy)
@@ -18304,7 +18304,7 @@ 
   [(set (match_operand:SWI48 0 "register_operand")
   	(mult:SWI48 (match_dup 0)
 		    (match_operand:SWI48 1 "const_int_operand")))]
-  "exact_log2 (INTVAL (operands[1])) >= 0
+  "pow2p_hwi (INTVAL (operands[1]))
    && peep2_regno_dead_p (0, FLAGS_REG)"
   [(parallel [(set (match_dup 0) (ashift:SWI48 (match_dup 0) (match_dup 1)))
 	      (clobber (reg:CC FLAGS_REG))])]
@@ -18316,7 +18316,7 @@ 
 	  (mult:SI (match_operand:SI 1 "register_operand")
 		   (match_operand:SI 2 "const_int_operand"))))]
   "TARGET_64BIT
-   && exact_log2 (INTVAL (operands[2])) >= 0
+   && pow2p_hwi (INTVAL (operands[2]))
    && REGNO (operands[0]) == REGNO (operands[1])
    && peep2_regno_dead_p (0, FLAGS_REG)"
   [(parallel [(set (match_dup 0)