MaskRay added a comment.
Without the patch
% strace -fc -e file /tmp/RelA/bin/clang '-###' a.cc
...
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
74.57 0.002809 8 331 312 openat
13.83 0.000521 5 91 46 stat
10.01 0.000377 6 58 47 access
0.96 0.000036 7 5 readlink
0.50 0.000019 19 1 unlink
0.13 0.000005 1 5 lstat
0.00 0.000000 0 1 execve
------ ----------- ----------- --------- --------- ----------------
100.00 0.003767 492 405 total
With the patch
% strace -fc -e file /tmp/RelA/bin/clang '-###' a.cc
...
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
59.13 0.002345 9 239 220 openat
21.66 0.000859 8 97 50 stat
15.08 0.000598 10 58 47 access
1.82 0.000072 14 5 readlink
1.08 0.000043 43 1 execve
0.73 0.000029 29 1 unlink
0.50 0.000020 4 5 lstat
------ ----------- ----------- --------- --------- ----------------
100.00 0.003966 406 317 total
A cross compile gets improved, too (`strace -fc -e file /tmp/RelA/bin/clang++
-target powerpc64le-linux-gnu -isystem
/usr/powerpc64le-linux-gnu/include/c++/9/powerpc64le-linux-gnu/ a.cc`): 438
openat calls -> 414.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D87901/new/
https://reviews.llvm.org/D87901
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