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Allow conversions in X/[ex]4 < Y/[ex]4 

2019-06-11  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* match.pd (X/[ex]4<Y/[ex]4): Handle conversions.

gcc/testsuite/
	* gcc.dg/tree-ssa/cmpexactdiv-5.c: New file.

From-SVN: r272158
This commit is contained in:
Marc Glisse 2019-06-11 17:22:43 +02:00 committed by Marc Glisse
parent d3786ebbb0
commit 9adfa8e25f
4 changed files with 38 additions and 4 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2019-06-11 Marc Glisse <marc.glisse@inria.fr>
* match.pd (X/[ex]4<Y/[ex]4): Handle conversions.
2019-06-11 Matthew Beliveau <mbelivea@redhat.com>
PR c++/90449 - add -Winaccessible-base option.

23
gcc/match.pd
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@ -1503,11 +1503,26 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* X / 4 < Y / 4 iff X < Y when the division is known to be exact. */
(for cmp (simple_comparison)
(simplify
(cmp (exact_div @0 INTEGER_CST@2) (exact_div @1 @2))
(if (wi::gt_p (wi::to_wide (@2), 0, TYPE_SIGN (TREE_TYPE (@2))))
(cmp @0 @1)
(cmp (convert?@3 (exact_div @0 INTEGER_CST@2)) (convert? (exact_div @1 @2)))
(if (element_precision (@3) >= element_precision (@0)
&& types_match (@0, @1))
(if (wi::lt_p (wi::to_wide (@2), 0, TYPE_SIGN (TREE_TYPE (@2))))
(cmp @1 @0)))))
(if (!TYPE_UNSIGNED (TREE_TYPE (@3)))
(cmp @1 @0)
(if (tree_expr_nonzero_p (@0) && tree_expr_nonzero_p (@1))
(with
{
tree utype = unsigned_type_for (TREE_TYPE (@0));
}
(cmp (convert:utype @1) (convert:utype @0)))))
(if (wi::gt_p (wi::to_wide (@2), 1, TYPE_SIGN (TREE_TYPE (@2))))
(if (TYPE_UNSIGNED (TREE_TYPE (@0)) || !TYPE_UNSIGNED (TREE_TYPE (@3)))
(cmp @0 @1)
(with
{
tree utype = unsigned_type_for (TREE_TYPE (@0));
}
(cmp (convert:utype @0) (convert:utype @1)))))))))
/* X / C1 op C2 into a simple range test. */
(for cmp (simple_comparison)

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2019-06-11 Marc Glisse <marc.glisse@inria.fr>
* gcc.dg/tree-ssa/cmpexactdiv-5.c: New file.
2019-06-11 Matthew Beliveau <mbelivea@redhat.com>
PR c++/90449 - add -Winaccessible-base option.

11
gcc/testsuite/gcc.dg/tree-ssa/cmpexactdiv-5.c Normal file
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@ -0,0 +1,11 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized-raw" } */
int f(int *a, int *b, int *c){
if(sizeof(__SIZE_TYPE__) != sizeof(__PTRDIFF_TYPE__)) return 2;
__SIZE_TYPE__ s = b - a;
__SIZE_TYPE__ t = c - a;
return s < t;
}
/* { dg-final { scan-tree-dump-not "exact_div_expr" "optimized" } } */