Hi,
I just found the perl script for x86_64 assembly failed to detect Xcode 7
environment (Apple LLVM 7.x), and skipped generating AVX code for MAC OS ($avx
variable is always false). The reason is Apple since Xcode 7.0 removed string
"based on LLVM x.y.z" from version information. Now the clang -v command
returns:
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.0.0
Thread model: posix
So the way to detect compiler version becomes to check either "LLVM version" or
"clang-". Here is a patch to check the first string (take rsaz-avx2.pl as an
example):
if (!$avx && `$ENV{CC} -v 2>&1` =~ /LLVM version ([0-9]+)\./) {
$avx = ($1>=5) + ($1>=5);
$addx = ($1>=5);
}
Version number 5 is used but not 7 due to the reason Apple start AVX support
from Xcode 5 (LLVM 5).
A list of Xcode records can be found here:
https://gist.github.com/yamaya/2924292
[https://avatars0.githubusercontent.com/u/278790?v=3&s=400]<https://gist.github.com/yamaya/2924292>
Xcode clang version record ยท GitHub
After today's update of command line tools/xcode I get: About Xcode: Version
6.3 (6D570) /usr/bin/clang++ --version Apple LLVM version 6.1.0
(clang-602.0.49) (based ...
Read more...<https://gist.github.com/yamaya/2924292>
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