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/freebsd/sys/amd64/include/
H A Dcpufunc.hdiff 0e727642322453c79ff3e96ccf91b0b790c76f46 Thu Apr 14 18:53:32 CEST 2011 Jung-uk Kim <jkim@FreeBSD.org> Add a function rdtsc32() to read lower 32 bits from TSC and discard upper
32 bits. Some times compiler inserts unnecessary instructions to preserve
unused upper 32 bits even when it is casted to a 32-bit value. It reduces
such compiler mistakes where every cycle counts.