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Add pg_noinline macro to c.h. 

Forcing a function not to be inlined can be useful if it's the
slow-path of a performance critical function, or should be visible in
profiles to allow for proper cost attribution.

Author: Andres Freund
Discussion: https://postgr.es/m/20170914061207.zxotvyopetm7lrrp@alap3.anarazel.de
This commit is contained in:
Andres Freund 2017-10-13 11:44:51 -07:00
parent d133982d59
commit a0247e7a11
1 changed files with 16 additions and 0 deletions
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16
src/include/c.h
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@ -642,6 +642,22 @@ typedef NameData *Name;
#define pg_attribute_noreturn()
#endif
/*
* Forcing a function not to be inlined can be useful if it's the slow-path of
* a performance critical function, or should be visible in profiles to allow
* for proper cost attribution.
*/
/* GCC, Sunpro and XLC support noinline via __attribute */
#if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
#define pg_noinline __attribute__((noinline))
/* msvc via declspec */
#elif defined(_MSC_VER)
#define pg_noinline __declspec(noinline)
#else
#define pg_noinline
#endif
/* ----------------------------------------------------------------
* Section 6: assertions
* ----------------------------------------------------------------