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tree-eh.c (lower_eh_constructs_2): Don't add assignments below statements that can't fall thru.

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* tree-eh.c (lower_eh_constructs_2): Don't add assignments
        below statements that can't fall thru.

testsuite/
        * g++.dg/tree-ssa/pr41905.C: New testcase.

From-SVN: r154674
This commit is contained in:
Michael Matz 2009-11-26 15:54:07 +00:00 committed by Michael Matz
parent 6dc3bf569b
commit 87cd42599c
4 changed files with 19 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-11-26 Michael Matz <matz@suse.de>
PR tree-optimization/41905
* tree-eh.c (lower_eh_constructs_2): Don't add assignments
below statements that can't fall thru.
2009-11-26 Michael Matz <matz@suse.de>
* builtins.c (expand_builtin_printf, expand_builtin_fprintf,

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2009-11-26 Michael Matz <matz@suse.de>
PR tree-optimization/41905
* g++.dg/tree-ssa/pr41905.C: New testcase.
2009-11-25 Richard Henderson <rth@redhat.com>
* gcc.dg/vect/slp-21.c: Succeed with vect_extract_even_odd too.

4
gcc/testsuite/g++.dg/tree-ssa/pr41905.C Normal file
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@ -0,0 +1,4 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
int foo() __attribute__((noreturn));
int bar() { return foo(); }

5
gcc/tree-eh.c
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@ -1868,9 +1868,12 @@ lower_eh_constructs_2 (struct leh_state *state, gimple_stmt_iterator *gsi)
case GIMPLE_ASSIGN:
/* If the stmt can throw use a new temporary for the assignment
to a LHS. This makes sure the old value of the LHS is
available on the EH edge. */
available on the EH edge. Only do so for statements that
potentially fall thru (no noreturn calls e.g.), otherwise
this new assignment might create fake fallthru regions. */
if (stmt_could_throw_p (stmt)
&& gimple_has_lhs (stmt)
&& gimple_stmt_may_fallthru (stmt)
&& !tree_could_throw_p (gimple_get_lhs (stmt))
&& is_gimple_reg_type (TREE_TYPE (gimple_get_lhs (stmt))))
{