Make more fixes and improvements

- Remove PAGESIZE constant
- Fix realloc() documentation
- Fix ttyname_r() error reporting
- Make forking more reliable on Windows
- Make execvp() a few microseconds faster
- Make system() a few microseconds faster
- Tighten up the socket-related magic numbers
- Loosen restrictions on mmap() offset alignment
- Improve GetProgramExecutableName() with getenv("_")
- Use mkstemp() as basis for mktemp(), tmpfile(), tmpfd()
- Fix flakes in pthread_cancel_test, unix_test, fork_test
- Fix recently introduced futex stack overflow regression
- Let sockets be passed as stdio to subprocesses on Windows
- Improve security of bind() on Windows w/ SO_EXCLUSIVEADDRUSE
This commit is contained in:
Justine Tunney 2023-07-29 18:44:15 -07:00
parent 140a8a52e5
commit 18bb5888e1
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
311 changed files with 1239 additions and 2622 deletions

View file

@ -27,6 +27,7 @@
#include "dsp/scale/scale.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigset.h"
#include "libc/intrin/bsr.h"
#include "libc/intrin/pmulhrsw.h"
#include "libc/log/check.h"
#include "libc/log/log.h"
@ -80,6 +81,14 @@ struct YCbCr {
} luma, chroma;
};
static unsigned long roundup2pow(unsigned long x) {
return x > 1 ? 2ul << _bsrl(x - 1) : x ? 1 : 0;
}
static unsigned long rounddown2pow(unsigned long x) {
return x ? 1ul << _bsrl(x) : 0;
}
/**
* Computes magnums for YCbCr decoding.
*
@ -95,8 +104,8 @@ void YCbCrComputeCoefficients(int swing, double gamma,
double x;
double f1[6][3];
long longs[6][6];
long bitlimit = _roundup2pow(swing);
long wordoffset = _rounddown2pow((bitlimit - swing) / 2);
long bitlimit = roundup2pow(swing);
long wordoffset = rounddown2pow((bitlimit - swing) / 2);
long chromaswing = swing + 2 * (bitlimit / 2. - swing / 2. - wordoffset);
long lumamin = wordoffset;
long lumamax = wordoffset + swing;