cjdb added a comment.
Looking at the output from Clang 14 <https://godbolt.org/z/5rjxa5nTT>, I'm
observing that a binary with 178 function templates is 13% the size of the one
with 89 function objects. When only one function object is used vs all 178
function templates, the functions still win out, with the binary being 80% the
size.
The AST also becomes substantially larger.
I ran `time clang++-13 -c file.cpp -std=c++20 -Oz -DNDEBUG` locally, a hundred
times, and got the following results:
# Function objects
real mean: 0.07447
real median: 0.074
real stddev: 0.002267268191
sys mean: 0.01664
sys median: 0.016
sys stddev: 0.005569614534
user mean: 0.05785
user median: 0.057
user stddev: 0.005848896987
# Function templates
real mean: 0.06336
real median: 0.063
real stddev: 0.002076905235
sys mean: 0.01701
sys median: 0.017
sys stddev: 0.005545942188
user mean: 0.04645
user median: 0.047
user stddev: 0.005678908346
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D129951/new/
https://reviews.llvm.org/D129951
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
