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ipa/103989 - tame IPA optimizations at -Og

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With -Og we are not prepared to do cleanup after IPA optimizations
and dead code exposed by those confuses late diagnostic passes.
This is a first patch removing unwanted IPA optimizations, namely
both late modref and pure-const analysis.

2022-01-18  Richard Biener  <rguenther@suse.de>

	PR ipa/103989
	* passes.def (pass_all_optimizations_g): Remove pass_modref
	and pass_local_pure_const.
This commit is contained in:
Richard Biener 2022-01-18 13:31:56 +01:00
parent 7402e40a2e
commit e89b2a270d
1 changed files with 3 additions and 2 deletions
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5
gcc/passes.def
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@ -372,6 +372,9 @@ along with GCC; see the file COPYING3. If not see
POP_INSERT_PASSES ()
NEXT_PASS (pass_all_optimizations_g);
PUSH_INSERT_PASSES_WITHIN (pass_all_optimizations_g)
/* The idea is that with -Og we do not perform any IPA optimization
so post-IPA work should be restricted to semantically required
passes and all optimization work is done early. */
NEXT_PASS (pass_remove_cgraph_callee_edges);
NEXT_PASS (pass_strip_predict_hints, false /* early_p */);
/* Lower remaining pieces of GIMPLE. */
@ -399,8 +402,6 @@ along with GCC; see the file COPYING3. If not see
number of false positives from it. */
NEXT_PASS (pass_split_crit_edges);
NEXT_PASS (pass_late_warn_uninitialized);
NEXT_PASS (pass_local_pure_const);
NEXT_PASS (pass_modref);
/* uncprop replaces constants by SSA names. This makes analysis harder
and thus it should be run last. */
NEXT_PASS (pass_uncprop);