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max(INT_MIN, x) -> x 

2016-04-21  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* match.pd (min(int_max, x), max(int_min, x)): New transformations.

gcc/testsuite/
	* gcc.dg/tree-ssa/minmax-1.c: New testcase.

From-SVN: r235323
This commit is contained in:
Marc Glisse 2016-04-21 11:32:32 +02:00 committed by Marc Glisse
parent bbe008b6e9
commit 2c2870a1b1
4 changed files with 35 additions and 8 deletions
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4
gcc/ChangeLog
View File

@ -1,3 +1,7 @@
2016-04-21 Marc Glisse <marc.glisse@inria.fr>
* match.pd (min(int_max, x), max(int_min, x)): New transformations.
2016-04-20 Jan Hubicka <jh@suse.cz>
* ipa-inline.c (can_inline_edge_p): Pass caller info to

26
gcc/match.pd
View File

@ -1192,16 +1192,26 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
@1)
(simplify
(min @0 @1)
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MIN_VALUE (type)
&& operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
@1))
(switch
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MIN_VALUE (type)
&& operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
@1)
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MAX_VALUE (type)
&& operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
@0)))
(simplify
(max @0 @1)
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MAX_VALUE (type)
&& operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
@1))
(switch
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MAX_VALUE (type)
&& operand_equal_p (@1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST))
@1)
(if (INTEGRAL_TYPE_P (type)
&& TYPE_MIN_VALUE (type)
&& operand_equal_p (@1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST))
@0)))
(for minmax (FMIN FMAX)
/* If either argument is NaN, return the other one. Avoid the
transformation if we get (and honor) a signalling NaN. */

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2016-04-21 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/minmax-1.c: New testcase.
2016-04-20 Jan Hubicka <jh@suse.cz>
PR ipa/70018

9
gcc/testsuite/gcc.dg/tree-ssa/minmax-1.c Normal file
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@ -0,0 +1,9 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized" } */
static int min(int a,int b){return (a<b)?a:b;}
static int max(int a,int b){return (a<b)?b:a;}
int f(int x){return max(x,-__INT_MAX__-1);}
int g(int x){return min(x,__INT_MAX__);}
/* { dg-final { scan-tree-dump-times "return x_\[0-9\]+.D.;" 2 "optimized" } } */