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re PR tree-optimization/21562 (Quiet bad codegen (unrolling + tail call interaction))

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PR tree-optimization/21562
	* cfgexpand.c (construct_init_block): Deal properly with the case
	of entry edge not pointing to very first basic block.

From-SVN: r100305
This commit is contained in:
Jan Hubicka 2005-05-29 00:27:04 +02:00 committed by Jan Hubicka
parent 6be8b52474
commit fd44f634fd
4 changed files with 51 additions and 13 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2005-05-29 Jan Hubicka <jh@suse.cz>
PR tree-optimization/21562
* cfgexpand.c (construct_init_block): Deal properly with the case
of entry edge not pointing to very first basic block.
2005-05-28 Kazu Hirata <kazu@cs.umass.edu>
* tree-ssa-ccp.c (ccp_fold): Remove code that produces

29
gcc/cfgexpand.c
View File

@ -1157,22 +1157,25 @@ static basic_block
construct_init_block (void)
{
basic_block init_block, first_block;
edge e = NULL, e2;
edge_iterator ei;
edge e = NULL;
int flags;
FOR_EACH_EDGE (e2, ei, ENTRY_BLOCK_PTR->succs)
/* Multiple entry points not supported yet. */
gcc_assert (EDGE_COUNT (ENTRY_BLOCK_PTR->succs) == 1);
e = EDGE_SUCC (ENTRY_BLOCK_PTR, 0);
/* When entry edge points to first basic block, we don't need jump,
otherwise we have to jump into proper target. */
if (e && e->dest != ENTRY_BLOCK_PTR->next_bb)
{
/* Clear EDGE_EXECUTABLE. This flag is never used in the backend.
tree label = tree_block_label (e->dest);
For all other blocks this edge flag is cleared while expanding
a basic block in expand_gimple_basic_block, but there we never
looked at the successors of the entry block.
This caused PR17513. */
e2->flags &= ~EDGE_EXECUTABLE;
if (e2->dest == ENTRY_BLOCK_PTR->next_bb)
e = e2;
emit_jump (label_rtx (label));
flags = 0;
}
else
flags = EDGE_FALLTHRU;
init_block = create_basic_block (NEXT_INSN (get_insns ()),
get_last_insn (),
@ -1183,7 +1186,7 @@ construct_init_block (void)
{
first_block = e->dest;
redirect_edge_succ (e, init_block);
e = make_edge (init_block, first_block, EDGE_FALLTHRU);
e = make_edge (init_block, first_block, flags);
}
else
e = make_edge (init_block, EXIT_BLOCK_PTR, EDGE_FALLTHRU);

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2005-05-29 Jan Hubicka <jh@suse.cz>
* gcc.c-torture/compile/pr21562.c: New.
2005-05-28 Steven G. Kargl <kargls@comcast.net>
* gfortran.dg/subnormal_1.f90: New test.

25
gcc/testsuite/gcc.c-torture/compile/pr21562.c Normal file
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@ -0,0 +1,25 @@
/* { dg-options "-O3 -fno-inline" } */
struct foo { int a, b, c; };
void abort(void);
void exit(int);
void
brother (int a, int b, int c)
{
if (a)
abort ();
}
void
sister (struct foo f, int b, int c)
{
brother ((f.b == b), b, c);
}
int
main ()
{
struct foo f = { 7, 8, 9 };
sister (f, 1, 2);
exit (0);
}