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toolchain.eclass: add workaround for hybrid CPUs #35877

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toolchain.eclass: add workaround for hybrid CPUs #35877

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1c21a20
toolchain.eclass: fix whitespace
thesamesam Mar 23, 2024
fcccec0
toolchain.eclass: add workaround for hybrid CPUs
thesamesam Mar 23, 2024
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20 changes: 19 additions & 1 deletion eclass/toolchain.eclass
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Original file line number Diff line number Diff line change
Expand Up @@ -1567,6 +1567,24 @@ gcc_do_filter_flags() {
fi
fi

declare -A l1_cache_sizes=()
# Workaround for inconsistent cache sizes on hybrid P/E cores
# See PR111768 (and bug #904426, bug #908523, and bug #915389)
if [[ ${CBUILD} == x86_64* || ${CBUILD} == i?86* && ${CFLAGS} == *-march=native* ]] && tc-is-gcc ; then
local x
local l1_cache_size
# Iterate over all cores and find their L1 cache size
for x in $(seq 0 $(($(nproc)-1))) ; do
[[ -z ${x} || ${x} -gt 64 ]] && break
local l1_cache_size=$(taskset --cpu-list ${x} $(tc-getCC) -Q --help=params -O2 -march=native \
| awk '{ if ($1 ~ /^.*param.*l1-cache-size/) print $2; }' || die)
l1_cache_sizes[${l1_cache_size}]=1
done
# If any of them are different, just pick the first one.
if [[ ${#l1_cache_sizes} != 1 ]] ; then
append-flags --param=l1-cache-size=${l1_cache_size}
fi
fi

if ver_test -lt 13.6 ; then
# These aren't supported by the just-built compiler either.
Expand Down Expand Up @@ -1886,7 +1904,7 @@ toolchain_src_install() {
# See https://gcc.gnu.org/onlinedocs/gcc-11.3.0/jit/internals/index.html#packaging-notes
# and bug #843341.
#
# Both of the non-JIT and JIT builds are configured to install to $(DESTDIR)
# Both of the non-JIT and JIT builds are configured to install to $(DESTDIR)
# Install the configuration with --enable-host-shared first
# *then* the one without, so that the faster build
# of "cc1" et al overwrites the slower build.
Expand Down