Improves the accuracy of measurements, especially in short sections.
To quote the Intel 64 and IA-32 Architectures Software Developer's Manual:
"The RDTSC instruction is not a serializing instruction. It does not necessarily
wait until all previous instructions have been executed before reading the counter.
Similarly, subsequent instructions may begin execution before the read operation
is performed. If software requires RDTSC to be executed only after all previous
instructions have completed locally, it can either use RDTSCP (if the processor
supports that instruction) or execute the sequence LFENCE;RDTSC."
SSE2 is a requirement for lfence so only use it on SSE2-capable systems.
Prefer lfence;rdtsc over rdtscp since rdtscp is supported on fewer systems.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
* qatar/master:
cmutils: include shellapi.h on Win32 (for CommandLineToArgvW).
x86/timer: implement an intrinsic-based version for rdtsc (AV_READ_TIME).
id3v2: add a mimetype for bmp pictures.
flacdec: be less strict when parsing attached pictures.
flacdec: don't create an attached picture stream until we have all information.
Conflicts:
configure
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Michael Niedermayer
Henrik Gramner
Alex Smith
Ronald S. Bultje
Mans Rullgard