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re PR tree-optimization/69347 (excessive compile time with -O2)

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PR middle-end/69347
	* tree-ssa-threadbackwards.c
	(fsm_find_control_statement_thread_paths): Do not try to lookup
	FSM paths for SSA_NAMEs appearing in abnormal PHIs.

From-SVN: r232593
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Jeff Law 2016-01-19 16:03:26 -07:00 committed by Jeff Law
parent 4a8c29cc7a
commit 89d0fecd2d
2 changed files with 12 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-01-19 Jeff Law <law@redhat.com>
PR middle-end/69347
* tree-ssa-threadbackwards.c
(fsm_find_control_statement_thread_paths): Do not try to lookup
FSM paths for SSA_NAMEs appearing in abnormal PHIs.
2016-01-20 Kugan Vivekanandarajah <kuganv@linaro.org> 2016-01-20 Kugan Vivekanandarajah <kuganv@linaro.org>
* doc/lto.texi: Remove text that says only Gold has linker plugin * doc/lto.texi: Remove text that says only Gold has linker plugin

5
gcc/tree-ssa-threadbackward.c
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@ -99,6 +99,11 @@ fsm_find_control_statement_thread_paths (tree name,
vec<basic_block, va_gc> *&path, vec<basic_block, va_gc> *&path,
bool seen_loop_phi) bool seen_loop_phi)
{ {
/* If NAME appears in an abnormal PHI, then don't try to trace its
value back through PHI nodes. */
if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name))
return;
gimple *def_stmt = SSA_NAME_DEF_STMT (name); gimple *def_stmt = SSA_NAME_DEF_STMT (name);
basic_block var_bb = gimple_bb (def_stmt); basic_block var_bb = gimple_bb (def_stmt);