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Commit0b974db

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Add configure infrastructure to detect support for C99's restrict.
Will be used in later commits improving performance for a few keyroutines where information about aliasing allows for significantlybetter code generation.This allows to use the C99 'restrict' keyword without breaking C89, orfor that matter C++, compilers. If not supported it's defined to beempty.Author: Andres FreundDiscussion:https://postgr.es/m/20170914063418.sckdzgjfrsbekae4@alap3.anarazel.de
1 parent5fa6b0d commit0b974db

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4 files changed

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lines changed

4 files changed

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‎configure

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Original file line numberDiff line numberDiff line change
@@ -11545,6 +11545,52 @@ _ACEOF
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;;
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esac
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{$as_echo"$as_me:${as_lineno-$LINENO}: checking for C/C++ restrict keyword">&5
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$as_echo_n"checking for C/C++ restrict keyword...">&6; }
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if${ac_cv_c_restrict+:}false;then:
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$as_echo_n"(cached)">&6
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else
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ac_cv_c_restrict=no
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# The order here caters to the fact that C++ does not require restrict.
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forac_kwin __restrict __restrict__ _Restrict restrict;do
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cat confdefs.h -<<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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typedef int * int_ptr;
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int foo (int_ptr$ac_kw ip) {
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return ip[0];
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}
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int
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main ()
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{
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int s[1];
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int *$ac_kw t = s;
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t[0] = 0;
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return foo(t)
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile"$LINENO";then:
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ac_cv_c_restrict=$ac_kw
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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test"$ac_cv_c_restrict"!= no&&break
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done
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fi
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{$as_echo"$as_me:${as_lineno-$LINENO}: result:$ac_cv_c_restrict">&5
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$as_echo"$ac_cv_c_restrict">&6; }
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case$ac_cv_c_restrictin
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restrict) ;;
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no)$as_echo"#define restrict /**/">>confdefs.h
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;;
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*) cat>>confdefs.h<<_ACEOF
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#define restrict$ac_cv_c_restrict
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_ACEOF
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;;
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esac
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{$as_echo"$as_me:${as_lineno-$LINENO}: checking for printf format archetype">&5
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$as_echo_n"checking for printf format archetype...">&6; }
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if${pgac_cv_printf_archetype+:}false;then:

‎configure.in

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Original file line numberDiff line numberDiff line change
@@ -1299,6 +1299,7 @@ fi
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m4_defun([AC_PROG_CC_STDC], []) dnl We don't want that.
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AC_C_BIGENDIAN
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AC_C_INLINE
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AC_C_RESTRICT
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PGAC_PRINTF_ARCHETYPE
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AC_C_FLEXIBLE_ARRAY_MEMBER
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PGAC_C_SIGNED

‎src/include/pg_config.h.in

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Original file line numberDiff line numberDiff line change
@@ -923,6 +923,20 @@
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if such a type exists, and if the system does not define it. */
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#undef intptr_t
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/* Define to the equivalent of the C99 'restrict' keyword, or to
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nothing if this is not supported. Do not define if restrict is
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supported directly. */
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#undef restrict
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/* Work around a bug in Sun C++: it does not support _Restrict or
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__restrict__, even though the corresponding Sun C compiler ends up with
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"#define restrict _Restrict" or "#define restrict __restrict__" in the
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previous line. Perhaps some future version of Sun C++ will work with
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restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
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#if defined__SUNPRO_CC&& !defined__RESTRICT
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# define_Restrict
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# define__restrict__
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#endif
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/* Define to empty if the C compiler does not understand signed types. */
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#undef signed
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‎src/include/pg_config.h.win32

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Original file line numberDiff line numberDiff line change
@@ -681,6 +681,17 @@
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#define inline __inline
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#endif
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/* Define to the equivalent of the C99 'restrict' keyword, or to
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nothing if this is not supported. Do not define if restrict is
686+
supported directly. */
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/* Visual Studio 2008 and upwards */
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#if (_MSC_VER >= 1500)
689+
/* works for C and C++ in msvc */
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#define restrict __restrict
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#else
692+
#define restrict
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#endif
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/* Define to empty if the C compiler does not understand signed types. */
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/* #undef signed */
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