Visible to Intel only — GUID: GUID-2926C928-DF60-43AD-9102-FCD4F80255BE
Visible to Intel only — GUID: GUID-2926C928-DF60-43AD-9102-FCD4F80255BE
fnsplit, Qfnsplit
Enables function splitting. This feature is only available for ifort.
Syntax
Linux: |
-fnsplit[=n] -no-fnsplit |
macOS: |
None |
Windows: |
/Qfnsplit[:n] /Qfnsplit- |
Arguments
n |
Is an optional positive integer indicating the threshold number. The blocks can be placed into a different code segment if they are only reachable via a conditional branch whose taken probability is less than the specified n. Branch taken probability is heuristically calculated by the compiler and can be observed in assembly listings. The range for n is 0 <= n <= 100. |
Default
OFF |
Function splitting is not enabled. However, function grouping is still enabled. |
Description
This option enables function splitting. If you specify [Q]fnsplit with no n, you must also specify option [Q]prof-use, or the option will have no effect and no function splitting will occur.
If you specify n, function splitting is enabled and you do not need to specify option [Q]prof-use.
To disable function splitting when you use option [Q]prof-use, specify /Qfnsplit- (Windows*) or -no-fnsplit (Linux*).
Function splitting is generally not supported when exception handling is turned on for C/C++ routines in the stack of called routines. See also -fexceptions (Linux*).
IDE Equivalent
Alternate Options
Linux: -freorder-blocks-and-partition (a gcc option)
Windows: None