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loop discovery refers to the
process by which a compiler, or indeed any reader of a program,
determines which portions of the program are more likely to be executed
repeatedly as it is being run. Such discovery typically is done early
when compiling using optimization techniques, so the "discovered"
loops get more attention--and more run-time resources, such as
registers--from the compiler. It is easy to "discover" loops that are
constructed out of looping constructs in the language
(such as Fortran's
DO). For some programs, "discovering" loops
constructed out of lower-level constructs (such as
GOTO) can lead to generation of more optimal code
Future versions of GCC may zero-extend, or use
ptr_extend pattern. Do not rely on sign extension.
The analogous feature in Fortran is called an assigned goto, but that name seems inappropriate in C, where one can do more than simply store label addresses in label variables.
A file's basename
was the name stripped of all leading path information and of trailing
suffixes, such as `.h' or `.C' or `.cc'.
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