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Attempt to avoid false dependencies in scheduled code by making use of registers left over after register allocation

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docs state that it should be active by default if -funroll-loops, which we don't use.

docs:
Attempt to avoid false dependencies in scheduled code by making use of registers left over after register allocation. This optimization most benefits processors with lots of registers. Depending on the debug information format adopted by the target, however, it can make debugging impossible, since variables no longer stay in a “home register”.

Enabled by default with -funroll-loops.
This commit is contained in:
RubenKelevra
2022-05-14 20:59:21 +02:00
parent 82f35b871a
commit 27e539fb28
1 changed files with 1 additions and 1 deletions
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2
utils.go
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@@ -727,7 +727,7 @@ func setupMakepkg(march string) error {
}
makepkgStr = strings.ReplaceAll(makepkgStr, " color ", " !color ")
// Add align-functions=32, see https://github.com/InBetweenNames/gentooLTO/issues/164 for more
makepkgStr = strings.ReplaceAll(makepkgStr, "-O2", "-O3 -falign-functions=32 -mpclmul -fdevirtualize-at-ltrans -fgcse-sm -fgcse-las -flive-range-shrinkage -fira-loop-pressure -fsched-pressure -fmodulo-sched -fmodulo-sched-allow-regmoves -freschedule-modulo-scheduled-loops -fdelete-dead-exceptions -fgraphite -fgraphite-identity -fsplit-stack -fipa-pta -fisolate-erroneous-paths-attribute -fira-region=mixed -fsimd-cost-model=dynamic")
makepkgStr = strings.ReplaceAll(makepkgStr, "-O2", "-O3 -falign-functions=32 -mpclmul -fdevirtualize-at-ltrans -fgcse-sm -fgcse-las -flive-range-shrinkage -fira-loop-pressure -fsched-pressure -fmodulo-sched -fmodulo-sched-allow-regmoves -freschedule-modulo-scheduled-loops -fdelete-dead-exceptions -fgraphite -fgraphite-identity -fsplit-stack -fipa-pta -fisolate-erroneous-paths-attribute -fira-region=mixed -fsimd-cost-model=dynamic -frename-registers")
makepkgStr = strings.ReplaceAll(makepkgStr, "#MAKEFLAGS=\"-j2\"", "MAKEFLAGS=\"-j"+strconv.Itoa(conf.Build.Makej)+"\"")
makepkgStr = reMarch.ReplaceAllString(makepkgStr, "${1}"+march)
makepkgStr = strings.ReplaceAll(makepkgStr, "#PACKAGER=\"John Doe <john@doe.com>\"", "PACKAGER=\"ALHP "+march+" <alhp@harting.dev>\"")