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re PR tree-optimization/53979 (((a ^ b) | a) not optimized to (a | b)) 

2016-10-20  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR tree-optimization/53979
	* match.pd ((a ^ b) | a -> a | b): New pattern.

testsuite/
	* gcc.dg/pr53979-1.c: New test-case.
	* gcc.dg/pr53979-2.c: Likewise.

From-SVN: r241360
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Prathamesh Kulkarni 2016-10-20 07:55:28 +00:00 committed by Prathamesh Kulkarni
parent d480863abb
commit 2066ef6ac8
5 changed files with 37 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-10-20 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/53979
* match.pd ((a ^ b) | a -> a | b): New pattern.
2016-10-19 John David Anglin <danglin@gcc.gnu.org>
* config/pa/pa64-hpux.h (PA_INIT_FRAME_DUMMY_ASM_OP): Move to

6
gcc/match.pd
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@ -541,6 +541,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(bit_ior:c (bit_and @0 INTEGER_CST@2) (bit_and (bit_not @0) INTEGER_CST@1))
(if (wi::bit_not (@2) == @1)
(bit_xor @0 @1)))
/* PR53979: Transform ((a ^ b) | a) -> (a | b) */
(simplify
(bit_ior:c (bit_xor:c @0 @1) @0)
(bit_ior @0 @1))
/* Simplify (~X & Y) to X ^ Y if we know that (X & ~Y) is 0. */
#if GIMPLE
(simplify

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2016-10-20 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/53979
* gcc.dg/pr53979-1.c: New test-case.
* gcc.dg/pr53979-2.c: Likewise.
2016-10-19 Bernd Edlinger <bernd.edlinger@hotmail.de>
* c-c++-common/Wint-in-bool-context-2.c: New test.

9
gcc/testsuite/gcc.dg/pr53979-1.c Normal file
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@ -0,0 +1,9 @@
/* { dg-do compile } */
/* { dg-options "-fdump-tree-gimple" } */
unsigned f1(unsigned a, unsigned b)
{
return (a ^ b) | a;
}
/* { dg-final { scan-tree-dump "a | b" "gimple" } } */

11
gcc/testsuite/gcc.dg/pr53979-2.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-forwprop-details" } */
unsigned f(unsigned a, unsigned b)
{
unsigned t1 = a ^ b;
unsigned t2 = t1 | a;
return t2;
}
/* { dg-final { scan-tree-dump "gimple_simplified to t2_\[0-9\] = a_\[0-9\]*\\(D\\) | b_\[0-9\]*\\(D\\)" "forwprop1" } } */