From 7fe996ba15e8453ea966bd0a62861e012d7045b6 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Fri, 4 Dec 2015 08:09:46 +0000 Subject: [PATCH] re PR middle-end/67438 (~X op ~Y pattern relocation causes loop performance degradation on 32bit x86) 2015-12-04 Richard Biener 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 --- gcc/ChangeLog | 6 ++++++ gcc/match.pd | 10 ++++++---- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 977f7aed906..0a3fd7939dd 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-12-04 Richard Biener + + 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 Jiong Wang diff --git a/gcc/match.pd b/gcc/match.pd index ea512fb20b9..5ac30eb078f 100644 --- 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) -- 2.30.2