re PR middle-end/67438 (~X op ~Y pattern relocation causes loop performance degradati...

2015-12-04  Richard Biener  <rguenther@suse.de>

	PR middle-end/67438
	* match.pd: Guard ~X cmp ~Y -> Y cmp X and the variant with
	a constant with single_use.

From-SVN: r231245

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 977f7aed906a56f6abc412069d214b0d2b03237c..0a3fd7939dd5496e6e6b83c517efe87992c63184 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-12-04  Richard Biener  <rguenther@suse.de>
+
+       PR middle-end/67438
+       * match.pd: Guard ~X cmp ~Y -> Y cmp X and the variant with
+       a constant with single_use.
+
 2015-12-04  Bin Cheng  <bin.cheng@arm.com>
            Jiong Wang  <jiong.wang@arm.com>
 

diff --git a/gcc/match.pd b/gcc/match.pd
index ea512fb20b9903fbb6e7d5e4e6d7ab244ef346af..5ac30eb078fc79965b7352f621beeba7659e373e 100644 (file)
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -1855,15 +1855,17 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 /* Fold ~X op ~Y as Y op X.  */
 (for cmp (simple_comparison)
  (simplify
-  (cmp (bit_not @0) (bit_not @1))
-  (cmp @1 @0)))
+  (cmp (bit_not@2 @0) (bit_not@3 @1))
+  (if (single_use (@2) && single_use (@3))
+   (cmp @1 @0))))
 
 /* Fold ~X op C as X op' ~C, where op' is the swapped comparison.  */
 (for cmp (simple_comparison)
      scmp (swapped_simple_comparison)
  (simplify
-  (cmp (bit_not @0) CONSTANT_CLASS_P@1)
-  (if (TREE_CODE (@1) == INTEGER_CST || TREE_CODE (@1) == VECTOR_CST)
+  (cmp (bit_not@2 @0) CONSTANT_CLASS_P@1)
+  (if (single_use (@2)
+       && (TREE_CODE (@1) == INTEGER_CST || TREE_CODE (@1) == VECTOR_CST))
    (scmp @0 (bit_not @1)))))
 
 (for cmp (simple_comparison)