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re PR tree-optimization/15654 (ICE in calculate_live_on_entry with -O2 -fno-tree-dominator-opts) 

PR tree-optimization/15654
	* tree-tailcall.c (eliminate_tail_call): Remove unreachable code.

From-SVN: r84527
This commit is contained in:
Zdenek Dvorak 2004-07-11 21:57:47 +02:00 committed by Zdenek Dvorak
parent 6f4229658a
commit 8d3d51b52c
2 changed files with 21 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-07-11 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
PR tree-optimization/15654
* tree-tailcall.c (eliminate_tail_call): Remove unreachable code.
2004-07-11 Roger Sayle <roger@eyesopen.com>
* builtins.c (fold_builtin_fputs): Don't bother converting the

16
gcc/tree-tailcall.c
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@ -647,6 +647,7 @@ eliminate_tail_call (struct tailcall *t)
stmt_ann_t ann;
v_may_def_optype v_may_defs;
unsigned i;
block_stmt_iterator bsi;
stmt = bsi_stmt (t->call_bsi);
get_stmt_operands (stmt);
@ -666,6 +667,21 @@ eliminate_tail_call (struct tailcall *t)
first = ENTRY_BLOCK_PTR->succ->dest;
/* Remove the code after call_bsi that will become unreachable. The
possibly unreachable code in other blocks is removed later in
cfg cleanup. */
bsi = t->call_bsi;
bsi_next (&bsi);
while (!bsi_end_p (bsi))
{
/* Do not remove the return statement, so that redirect_edge_and_branch
sees how the block ends. */
if (TREE_CODE (bsi_stmt (bsi)) == RETURN_EXPR)
break;
bsi_remove (&bsi);
}
/* Replace the call by a jump to the start of function. */
e = redirect_edge_and_branch (t->call_block->succ, first);
if (!e)