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re PR rtl-optimization/51051 (build fails on cris-elf building libstdc++-v3) 

PR rtl-optimization/51051
	* cfgrtl.c (cfg_layout_can_merge_blocks_p): Return FALSE if the
	move would cause fallthrough into the exit block.

From-SVN: r181371
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Bernd Schmidt 2011-11-14 23:31:13 +00:00 committed by Hans-Peter Nilsson
parent 2747a04662
commit 894a84b5ed
2 changed files with 16 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-11-15 Bernd Schmidt <bernds@codesourcery.com>
PR rtl-optimization/51051
* cfgrtl.c (cfg_layout_can_merge_blocks_p): Return FALSE if the
move would cause fallthrough into the exit block.
2011-11-14 Richard Henderson <rth@redhat.com>
* config/rs6000/rs6000.c (emit_load_locked): Assert the mode is handled.

10
gcc/cfgrtl.c
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@ -2735,6 +2735,16 @@ cfg_layout_can_merge_blocks_p (basic_block a, basic_block b)
if (BB_PARTITION (a) != BB_PARTITION (b))
return false;
/* If we would end up moving B's instructions, make sure it doesn't fall
through into the exit block, since we cannot recover from a fallthrough
edge into the exit block occurring in the middle of a function. */
if (NEXT_INSN (BB_END (a)) != BB_HEAD (b))
{
edge e = find_fallthru_edge (b->succs);
if (e && e->dest == EXIT_BLOCK_PTR)
return false;
}
/* There must be exactly one edge in between the blocks. */
return (single_succ_p (a)
&& single_succ (a) == b