This is needed to free a stopchar_map bit for the next patch.
* read.c (find_percent_cached): Use strchr instead of STOP_SET
to find % or nul.
* makeint.h (MAP_PERCENT): Remove.
* main.c (initialize_stopchar_map): Remove.
---
main.c| 1 -
makeint.h | 1 -
read.c| 10 +-
3 files
This removes the hotspot in parse_file_seq's call to strpbrk, by using
SSE2 vector instructions. The resulting speedup on QEMU's noop build
is around 6% (15.4 seconds to 14.5).
The code is roughly based on GCC's similar optimizations in the lexer.
* read-opt.c: New.
* read.c (parse_file_seq): Us
In most cases, find_char_unquote has a single stopchar. In that
case we can look for it using strchr's optimized implementation.
The resulting speedup on QEMU's noop build is 4.4% (from 14.5 seconds
to 13.8).
* read.c (find_char_unquote): Rename to find_map_unquote. Replace
with an implementati
These patches optimize the hotspots in QEMU's "noop" build:
- patch 1: parse_file_seq / strpbrk
- patch 2: find_char_unquote
- patch 3: variable_hash_1 / variable_hash_2
- patches 4+5: handle_function
On my laptop this goes from ~15.4 seconds to ~13.0 (a 15% improvement).
(My employer has a bl
Use the stopchar map to quickly jump over everything that is not an
open/close brace, an open/close parenthesis or a comma. This provides
an 1.5% improvement on QEMU's noop build (from 13.2 seconds to 13).
* function.c (find_next_argument, handle_function): Ignore
characters quickly using the sto
The hottest hash table in Make is the variable hash, and it is
easy to apply a better function (that works on bigger chunks
than just one byte) because the length of its key is known.
This is about twice as fast as the current hash, and removes
the need for double hashing (improving locality of ref
