generate-flag-permutations.py

import itertools

args = ('-march=rocketlake -mabm --param=l1-cache-line-size=64 '
        '--param=l1-cache-size=48 --param=l2-cache-size=16384').split(' ')


def mabm(o: str):
    if o.startswith('-mabm'):
        return 'maz'
    return o.replace('-', '')


z = (sorted((set(' '.join(sorted(x, key=mabm))
                 for x in itertools.permutations(args, y))
             for y in range(1, len(args))),
            key=len))

for line in sorted(sorted(itertools.chain(*z), key=len), key=mabm):
    print(line)

kwin-results.md

Results

See below for methodology.

Flags	Working?
-march=x86-64-v2	✅
-march=x86-64-v3	✅
-march=x86-64-v4	❌
-march=rocketlake	❌
-march=rocketlake -mabm	❌
-march=rocketlake -mabm --param=l1-cache-line-size=64	❌
-march=rocketlake -mabm --param=l1-cache-line-size=64 --param=l1-cache-size=48	❌
-march=rocketlake -mabm --param=l1-cache-line-size=64 --param=l1-cache-size=48 --param=l2-cache-size=16384 (same as -march=native)	❌
-march=rocketlake -mabm --param=l1-cache-line-size=64 --param=l2-cache-size=16384	❌
-march=rocketlake -mabm --param=l1-cache-size=48	❌
-march=rocketlake -mabm --param=l1-cache-size=48 --param=l2-cache-size=16384	❌
-march=rocketlake -mabm --param=l2-cache-size=16384	❌
-march=rocketlake --param=l1-cache-line-size=64	❌
-march=rocketlake --param=l1-cache-line-size=64 --param=l1-cache-size=48	❌
-march=rocketlake --param=l1-cache-line-size=64 --param=l1-cache-size=48 --param=l2-cache-size=16384	❌
-march=rocketlake --param=l1-cache-line-size=64 --param=l2-cache-size=16384	❌
-march=rocketlake --param=l1-cache-size=48	❌
-march=rocketlake --param=l1-cache-size=48 --param=l2-cache-size=16384	❌
-march=rocketlake --param=l2-cache-size=16384	❌
-mabm	✅
-mabm --param=l1-cache-size=48	✅
-mabm --param=l2-cache-size=16384	✅
-mabm --param=l1-cache-line-size=64	✅
-mabm --param=l1-cache-size=48 --param=l2-cache-size=16384	✅
-mabm --param=l1-cache-line-size=64 --param=l1-cache-size=48	✅
-mabm --param=l1-cache-line-size=64 --param=l2-cache-size=16384	✅
-mabm --param=l1-cache-line-size=64 --param=l1-cache-size=48 --param=l2-cache-size=16384	✅
--param=l1-cache-line-size=64	✅
--param=l1-cache-line-size=64 --param=l1-cache-size=48	✅
--param=l1-cache-line-size=64 --param=l1-cache-size=48 --param=l2-cache-size=16384	✅
--param=l1-cache-line-size=64 --param=l2-cache-size=16384	✅
--param=l1-cache-size=48	✅
--param=l1-cache-size=48 --param=l2-cache-size=16384	✅
--param=l2-cache-size=16384	✅
(no flags)	✅

Methodology

Flag permutation generation script is attached.

1. Build every variant into a binpkg:

   while IFS=$'\n' read -r flags; do
       echo "$flags" &&
       rm -fR ./kde-plasma &&
       env FEATURES=-getbinpkg "CFLAGS=$flags" "CXXFLAGS=$flags" emerge --usepkg=n -1 kwin &&
       qpkg -P "$(pwd -P)" kwin &&
       cp -v ./kde-plasma/kwin/*.tbz2 "${OUTDIR}/kwin_x11.${flags// /.}"
   done < <(python generate-flag-permutations.py.py)

2. Install every binpkg, pausing to test each one by running kwin_x11 --replace in another terminal.

   cd "$OUTDIR"
   for i in *.tbz2; do
       flags="${i:12}" &&
       flags="${flags/.tbz2}" &&
       echo "${flags//./ }" &&
       rm -f /var/cache/binpkgs/kde-plasma/kwin/* &&
       cp "$i" "/var/cache/binpkgs/kde-plasma/kwin/${i:0:11}-1.xpak" &&
       emerge --usepkgonly -1 kwin &&
       echo 'Test!' &&
       read
   done