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re PR tree-optimization/90090 (ICE in mark_reachable_handlers, at tree-eh.c:3938 since r219202)

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PR tree-optimization/90090
	* tree-ssa-math-opts.c (is_division_by): Ignore divisions that can
	throw internally.
	(is_division_by_square): Likewise.  Formatting fix.

	* g++.dg/opt/pr90090.C: New test.

From-SVN: r270379
This commit is contained in:
Jakub Jelinek 2019-04-16 10:24:47 +02:00 committed by Jakub Jelinek
parent 8c996ec644
commit 41b5808d56
4 changed files with 36 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2019-04-16 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/90090
* tree-ssa-math-opts.c (is_division_by): Ignore divisions that can
throw internally.
(is_division_by_square): Likewise. Formatting fix.
2019-04-16 Richard Biener <rguenther@suse.de>
PR tree-optimization/56049

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-04-16 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/90090
* g++.dg/opt/pr90090.C: New test.
2019-04-16 Richard Biener <rguenther@suse.de>
PR tree-optimization/56049

19
gcc/testsuite/g++.dg/opt/pr90090.C Normal file
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@ -0,0 +1,19 @@
// PR tree-optimization/90090
// { dg-do compile }
// { dg-options "-Ofast -fno-associative-math -fsignaling-nans -fno-tree-dce -fnon-call-exceptions" }
double bar (double, double, double, double, double);
double baz ();
double
foo (double a)
{
try
{
return bar (1.0/a, 2.0/a, 4.0/a, 8.0/a, 16.0/a);
}
catch (...)
{
return baz ();
}
}

10
gcc/tree-ssa-math-opts.c
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@ -334,7 +334,8 @@ is_division_by (gimple *use_stmt, tree def)
/* Do not recognize x / x as valid division, as we are getting
confused later by replacing all immediate uses x in such
a stmt. */
&& gimple_assign_rhs1 (use_stmt) != def;
&& gimple_assign_rhs1 (use_stmt) != def
&& !stmt_can_throw_internal (cfun, use_stmt);
}
/* Return TRUE if USE_STMT is a multiplication of DEF by A. */
@ -367,13 +368,12 @@ is_division_by_square (gimple *use_stmt, tree def)
{
if (gimple_code (use_stmt) == GIMPLE_ASSIGN
&& gimple_assign_rhs_code (use_stmt) == RDIV_EXPR
&& gimple_assign_rhs1 (use_stmt) != gimple_assign_rhs2 (use_stmt))
&& gimple_assign_rhs1 (use_stmt) != gimple_assign_rhs2 (use_stmt)
&& !stmt_can_throw_internal (cfun, use_stmt))
{
tree denominator = gimple_assign_rhs2 (use_stmt);
if (TREE_CODE (denominator) == SSA_NAME)
{
return is_square_of (SSA_NAME_DEF_STMT (denominator), def);
}
return is_square_of (SSA_NAME_DEF_STMT (denominator), def);
}
return 0;
}