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riscv-gcc-1
Commit 269da1e9 by Kazu Hirata Committed by Kazu Hirata
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tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Use EDGE_COUNT instead of GOTO_DESTINATION. 

	* tree-ssa-dce.c (mark_stmt_if_obviously_necessary)
	<COND_EXPR>: Use EDGE_COUNT instead of GOTO_DESTINATION.

From-SVN: r89729
parent 42583407
Showing with 6 additions and 11 deletions
gcc/ChangeLog
2004-10-28 Kazu Hirata <kazu@cs.umass.edu>
* tree-ssa-dce.c (mark_stmt_if_obviously_necessary)
<COND_EXPR>: Use EDGE_COUNT instead of GOTO_DESTINATION.
2004-10-28 Joseph S. Myers <jsm@polyomino.org.uk>
* doc/contrib.texi, doc/cpp.texi, doc/cppopts.texi,
......
gcc/tree-ssa-dce.c
......@@ -330,17 +330,7 @@ mark_stmt_if_obviously_necessary (tree stmt, bool aggressive)
return;
case COND_EXPR:
if (GOTO_DESTINATION (COND_EXPR_THEN (stmt))
== GOTO_DESTINATION (COND_EXPR_ELSE (stmt)))
{
/* A COND_EXPR is obviously dead if the target labels are the same.
We cannot kill the statement at this point, so to prevent the
statement from being marked necessary, we replace the condition
with a constant. The stmt is killed later on in cfg_cleanup. */
COND_EXPR_COND (stmt) = integer_zero_node;
modify_stmt (stmt);
return;
}
gcc_assert (EDGE_COUNT (bb_for_stmt (stmt)->succs) == 2);
/* Fall through. */
case SWITCH_EXPR:
......
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