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Relax VIEW_CONVERT_EXPR - CONVERT_EXPR combination

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2017-05-25  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* match.pd (view_convert (convert@0 @1)): Handle zero-extension.

gcc/testsuite/
	* gcc.dg/tree-ssa/vce-1.c: New file.

From-SVN: r248449
This commit is contained in:
Marc Glisse 2017-05-25 10:50:54 +02:00 • committed by Marc Glisse
parent 11d6b45d43
commit bce8ef718d
4 changed files with 28 additions and 3 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2017-05-25 Marc Glisse <marc.glisse@inria.fr>
* match.pd (view_convert (convert@0 @1)): Handle zero-extension.
2017-05-25 Marc Glisse <marc.glisse@inria.fr>
* match.pd ((A +- CST1) +- CST2): Allow some conversions.

9
gcc/match.pd
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@ -1856,13 +1856,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
&& TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (@0)))
(convert @0)))
/* Strip inner integral conversions that do not change precision or size. */
/* Strip inner integral conversions that do not change precision or size, or
zero-extend while keeping the same size (for bool-to-char). */
(simplify
(view_convert (convert@0 @1))
(if ((INTEGRAL_TYPE_P (TREE_TYPE (@0)) || POINTER_TYPE_P (TREE_TYPE (@0)))
&& (INTEGRAL_TYPE_P (TREE_TYPE (@1)) || POINTER_TYPE_P (TREE_TYPE (@1)))
&& (TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
&& (TYPE_SIZE (TREE_TYPE (@0)) == TYPE_SIZE (TREE_TYPE (@1))))
&& TYPE_SIZE (TREE_TYPE (@0)) == TYPE_SIZE (TREE_TYPE (@1))
&& (TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1))
|| (TYPE_PRECISION (TREE_TYPE (@0)) > TYPE_PRECISION (TREE_TYPE (@1))
&& TYPE_UNSIGNED (TREE_TYPE (@1)))))
(view_convert @1)))
/* Re-association barriers around constants and other re-association

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2017-05-25 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/vce-1.c: New file.
2017-05-25 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/addadd.c: New file.

14
gcc/testsuite/gcc.dg/tree-ssa/vce-1.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
typedef struct { _Bool b; } A;
_Bool f(double u){
A a;
if(u==0)
a.b=1;
else
a.b=0;
return a.b;
}
/* { dg-final { scan-tree-dump-not "VIEW_CONVERT_EXPR" "optimized" } } */