0eb9265fe7
The current implementation of bytes::calc_crc computes the checksum one byte at a time which turns out to be quite slow, accounting for 15% of streaming in time for a modular Hello World. We have a crc32_unsigned version that processes 4 bytes at a time which we could use here, but since we bundle zlib we might as well use its highly optimized crc routines that can process up to 32 bytes at a time. So this patch makes us use zlib's crc32 in this hot code path. This reduces stream in time for a modular Hello World by around 15% for me with a release compiler. gcc/cp/ChangeLog: * Make-lang.in (CFLAGS-cp/module.o): Add $(ZLIBINC). * module.cc: Include <zlib.h>. (bytes::calc_crc): Use crc32 from zlib. (bytes_out::set_crc): Use crc32_combine from zlib. Reviewed-by: Jason Merill <jason@redhat.com> |
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| .github | ||
| c++tools | ||
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