From e89b2a270d31d7298d516ae545e256645992c7b9 Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 18 Jan 2022 13:31:56 +0100 Subject: [PATCH] ipa/103989 - tame IPA optimizations at -Og 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 PR ipa/103989 * passes.def (pass_all_optimizations_g): Remove pass_modref and pass_local_pure_const. --- gcc/passes.def | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/gcc/passes.def b/gcc/passes.def index 7880842..3e75de4 100644 --- a/gcc/passes.def +++ b/gcc/passes.def @@ -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); -- 2.7.4