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re PR middle-end/22057 (Poor -O0 debug information for for loops with no initializer)

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PR middle-end/22057
	* tree-cfgcleanup.c (cleanup_tree_cfg): Only remove forwarder
	blocks when optimizing.

From-SVN: r102142
This commit is contained in:
Ian Lance Taylor 2005-07-18 23:20:09 +00:00 committed by Ian Lance Taylor
parent 2928d0f870
commit 7825308e20
2 changed files with 22 additions and 8 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-07-18 Ian Lance Taylor <ian@airs.com>
PR middle-end/22057
* tree-cfgcleanup.c (cleanup_tree_cfg): Only remove forwarder
blocks when optimizing.
2005-07-18 Steve Ellcey <sje@cup.hp.com>
* common.opt (frename-registers): Initialize to 2.

24
gcc/tree-cfgcleanup.c
View File

@ -501,20 +501,28 @@ cleanup_tree_cfg (void)
retval = cleanup_control_flow ();
retval |= delete_unreachable_blocks ();
/* cleanup_forwarder_blocks can redirect edges out of SWITCH_EXPRs,
which can get expensive. So we want to enable recording of edge
to CASE_LABEL_EXPR mappings around the call to
cleanup_forwarder_blocks. */
start_recording_case_labels ();
retval |= cleanup_forwarder_blocks ();
end_recording_case_labels ();
/* Forwarder blocks can carry line number information which is
useful when debugging, so we only clean them up when
optimizing. */
if (optimize > 0)
{
/* cleanup_forwarder_blocks can redirect edges out of
SWITCH_EXPRs, which can get expensive. So we want to enable
recording of edge to CASE_LABEL_EXPR mappings around the call
to cleanup_forwarder_blocks. */
start_recording_case_labels ();
retval |= cleanup_forwarder_blocks ();
end_recording_case_labels ();
}
#ifdef ENABLE_CHECKING
if (retval)
{
gcc_assert (!cleanup_control_flow ());
gcc_assert (!delete_unreachable_blocks ());
gcc_assert (!cleanup_forwarder_blocks ());
if (optimize > 0)
gcc_assert (!cleanup_forwarder_blocks ());
}
#endif