Manual
Processor Dispatch
The Intel® compilers support two code paths when using automatic
processor dispatch. However, with the Intel C++ Compiler you can use manual
processor dispatch to support up to seven different versions of any one
function, targeting up to seven different processors.
To use manual processor dispatch, create processor-specific versions
of each function that you want to optimize using processor dispatch.
Use the following statements:
__declspec(cpu_specific(cpuid))
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per implementation
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__declspec(cpu_dispatch(cpuid-list))
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for dispatch function stub
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where cpuid is one of the following strings:
- generic
- pentium
- pentium_pro
- pentium_MMX
- pentium_II
- pentium_III
- pentium_4
You can use manual processor dispatch in conjunction with the -Qx
(-x on Linux*) options.
See the example on the next page.
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