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

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

From-SVN: r240281

gcc/ChangeLog

 2016-09-20  Uros Bizjak  <ubizjak@gmail.com>
 
+	* config/i386/i386.md (mult->ashift peephole2s): Use pow2p_hwi
+	instead of exact_log2.
+
+2016-09-20  Uros Bizjak  <ubizjak@gmail.com>
+
 	PR target/77621
 	* config/i386/i386.c (ix86_preferred_simd_mode) <case DFmode>:
 	Don't return word_mode for !TARGET_VECTORIZE_DOUBLE.
@@ -346,7 +351,8 @@
 
 2016-09-14  Pat Haugen  <pthaugen@us.ibm.com>
 
-	* loop-unroll.c (unroll_loop_runtime_iterations): Set probability of succ edge.
+	* loop-unroll.c (unroll_loop_runtime_iterations): Set probability
+	of succ edge.
 
 2016-09-14  Segher Boessenkool  <segher@kernel.crashing.org>
 
@@ -446,7 +452,7 @@
 
 2016-09-13  Tamar Christina  <tamar.christina@arm.com>
 
-	* config/aarch64/aarch64-builtins.c 
+	* config/aarch64/aarch64-builtins.c
 	(aarch64_init_simd_builtins): Fix builtin type signature printing.
 
 2016-09-13  Uros Bizjak  <ubizjak@gmail.com>

gcc/config/i386/i386.md

@@ -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)