Support for packed instructions?

Stephan Ceram <>
6 Mar 2009 16:02:42 GMT

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From: Stephan Ceram <>
Newsgroups: comp.compilers
Date: 6 Mar 2009 16:02:42 GMT
Organization: Compilers Central
Keywords: parallel, optimize, question
Posted-Date: 06 Mar 2009 21:20:58 EST

Many modern compilers support packed instructions (also called SIMD).
However, languages like ANSI-C do not allow to express the data
parallelism explicitly. So, some compiler vendors provide intrinsic
functions that can be manually added into the source code and force
the compiler to generate packed instructions. However, the manual
insertion of these intrinsic functions makes the code not more

Do you know of any compiler source-to-source optimizations that
automatically analyse ANSI-C code, find opportunities for the
utilization of packed instructions and finally add them to the source
code that is passed in the next step to a compiler? If so, how do such
approaches work in general?


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