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re PR tree-optimization/54824 (ICE in verify_loop_structure)

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2012-10-26  Richard Biener  <rguenther@suse.de>

	PR middle-end/54824
	* tree-optimize.c (execute_fixup_cfg): Insert __builtin_unreachable
	at the end of blocks with no successors.

	* gcc.dg/torture/pr54824.c: New testcase.

From-SVN: r192841
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Richard Biener 2012-10-26 10:12:35 +00:00 committed by Richard Biener
parent 3a0d99bb60
commit 9037dcc6ad
4 changed files with 46 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-10-26 Richard Biener <rguenther@suse.de>
PR middle-end/54824
* tree-optimize.c (execute_fixup_cfg): Insert __builtin_unreachable
at the end of blocks with no successors.
2012-10-26 Alexander Ivchenko <alexander.ivchenko@intel.com>
Uros Bizjak <ubizjak@gmail.com>

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-10-26 Richard Biener <rguenther@suse.de>
PR middle-end/54824
* gcc.dg/torture/pr54824.c: New testcase.
2012-10-26 Alexander Ivchenko <alexander.ivchenko@intel.com>
* gcc.target/i386/fxsave-1.c: New.

16
gcc/testsuite/gcc.dg/torture/pr54824.c Normal file
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@ -0,0 +1,16 @@
/* { dg-do compile } */
/* { dg-options "-w" } */
void __attribute__((noreturn)) bar(void)
{
}
void foo(int i, char *p, char *q)
{
while (*p++) {
if (i)
p++;
if (!*q++)
bar();
}
}

19
gcc/tree-optimize.c
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@ -180,6 +180,25 @@ execute_fixup_cfg (void)
FOR_EACH_EDGE (e, ei, bb->succs)
e->count = (e->count * count_scale
+ REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE;
/* If we have a basic block with no successors that does not
end with a control statement or a noreturn call end it with
a call to __builtin_unreachable. This situation can occur
when inlining a noreturn call that does in fact return. */
if (EDGE_COUNT (bb->succs) == 0)
{
gimple stmt = last_stmt (bb);
if (!stmt
|| (!is_ctrl_stmt (stmt)
&& (!is_gimple_call (stmt)
|| (gimple_call_flags (stmt) & ECF_NORETURN) == 0)))
{
stmt = gimple_build_call
(builtin_decl_implicit (BUILT_IN_UNREACHABLE), 0);
gimple_stmt_iterator gsi = gsi_last_bb (bb);
gsi_insert_after (&gsi, stmt, GSI_NEW_STMT);
}
}
}
if (count_scale != REG_BR_PROB_BASE)
compute_function_frequency ();