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Top Forums Programming Memory and cache access time discrepancy Post 302928318 by achenle on Wednesday 10th of December 2014 09:42:16 PM
Old 12-10-2014
The compiler's optimizer noted that the value of "r" was never used, and eliminated the operation.

And if the code isn't optimized, the compiler almost certainly produced a LOT more instructions than necessary to simply load a value from memory into a register.

Nevermind the time spend actually doing the rdtsc() routines themselves.
 

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g-ir-compiler(1)					      General Commands Manual						  g-ir-compiler(1)

NAME
g-ir-compiler - typelib compiler. SYNOPSIS
g-ir-compiler [OPTION...] GIRFILE DESCRIPTION
g-ir-compiler converts one or more GIR files into one or more typelib. It can either emit the raw typelib blob (default behavior) or C code (--code). The output will be written to standard output unless the --output is specified. OPTIONS
---help Show help options ---code Emit C code which is suitable for including in a shared library instead of a raw typelib. ---output=FILENAME Save the resulting output in FILENAME. ---verbose Show verbose messages ---debug Show debug messages ---no-init Do not include an initialization snippet to register the typelib in the respository. This can only be used if --code is also speci- fied. ---includedir=DIRECTORY Adds a directory which will be used to find includes inside the GIR format. ---module=MODULE FIXME ---shared-library=FILENAME Specifies the shared library where the symbols in the typelib can be found. The name of the library should not contain the leading lib prefix nor the ending shared library suffix. BUGS Report bugs at http://bugzilla.gnome.org/ in the glib product and introspection component. HOMEPAGE and CONTACT http://live.gnome.org/GObjectIntrospection AUTHORS
Mattias Clasen g-ir-compiler(1)
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