staticfloat
commented
1 year ago To test this branch out on your local Julia, run the following script:
JULIA_PREFIX=/path/to/julia
# Back up normal LBT
for f in ${JULIA_PREFIX}/lib/julia/libblastrampoline*; do
cp -v ${f} ${f}.backup
done
# Build new LBT
cd src
make
# Install new LBT into Julia's lib/julia directory
cp build/libblastrampoline.5.dylib ${JULIA_PREFIX}/lib/julia/libblastrampoline.5.dylib
cp build/libblastrampoline.5.dylib ${JULIA_PREFIX}/lib/julia/libblastrampoline.dylibThen, when you launch Julia, load Accelerate via:
using LinearAlgebra
# Load LP64 interface first
BLAS.lbt_forward("/System/Library/Frameworks/Accelerate.framework/Accelerate"; suffix_hint="\x1a\$NEWLAPACK", verbose=true, clear=true)
# Load ILP64 interface next
BLAS.lbt_forward("/System/Library/Frameworks/Accelerate.framework/Accelerate"; suffix_hint="\x1a\$NEWLAPACK\$ILP64", verbose=true)
# Ensure that an ILP64 interface was actually loaded:
config = BLAS.get_config()
if !any(lib.interface == :ilp64 for lib in config.loaded_libs)
@error("No ILP64 interfaces found; are you sure you're on macOS 13.3 or higher?!")
end
# Show LBT config:
display(BLAS.get_config())
ViralBShah
amontoison
ctkelley
The new Accelerate released in macOS v13.3 provides two new interfaces; an upgraded LAPACK for the LP64 interface, and an all-new ILP64 interface (that uses the same upgraded LAPACK). These symbols are available from Accelerate with the suffix
$NEWLAPACKand$NEWLAPACK$ILP64, respectively.Unfortunately, this is not a "true" suffix, as Apple has decided to drop the trailing underscore from the typical F77 names, meaning that a symbol such as
dgemm_gets mangled todgemm$NEWLAPACK, whereas a CBLAS symbol such ascblas_zdotc_subgets mangled tocblas_zdotc_sub$NEWLAPACK. This means that we need to selectively erase the trailing underscore from some symbols when applying this Accelerate suffix.To do this, we add a new feature, enabled by default only on Apple builds, called
SYMBOL_TRIMMING, which allows asuffix_hintto contain the ASCII "substitution character"0x1aas the first character of the suffix hint to mean "remove a trailing underscore when applying this suffix".To make dealing with suffix hints easier for command-line users, these suffix hints are available for use in
LBT_BACKING_LIBSby listing libraries separated by suffix hints with an exclamation point, e.g.libname!suffix.