On 10.04.2018 13:40, Alexander Monakov wrote: > Hi, > > this fixes a simple "regression" under the qsort_chk umbrella: sched-deps > analysis has deps->readonly flag, but macro-fusion code does not respect it > and mutates instructions. This breaks an assumption in sel_rank_for_schedule > and manifests as qsort checking error. > > Since sched_macro_fuse_insns is only called to set SCHED_GROUP_P on suitable > insns, guard the call with !deps->readonly. > > Bootstrapped/regtested on x86_64 with sel-sched active and > --with-cpu=sandybridge to exercise macro-fusion code and verified on aarch64 > cross-compiler that the failing testcase given in the PR is fixed. > > OK to apply?
Fine with me but you need a scheduler maintainer approval. Andrey > > Thanks. > Alexander > > PR rtl-optimization/84566 > * sched-deps.c (sched_analyze_insn): Check deps->readonly when invoking > sched_macro_fuse_insns. > > diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c > index 9a5cbebea40..120b5f0ddc1 100644 > --- a/gcc/sched-deps.c > +++ b/gcc/sched-deps.c > @@ -2897,7 +2897,8 @@ sched_analyze_insn (struct deps_desc *deps, rtx x, > rtx_insn *insn) > && code == SET); > > /* Group compare and branch insns for macro-fusion. */ > - if (targetm.sched.macro_fusion_p > + if (!deps->readonly > + && targetm.sched.macro_fusion_p > && targetm.sched.macro_fusion_p ()) > sched_macro_fuse_insns (insn); > >
