From c171818b275b9dbd6a1f1cf1666e9e72237f75e6 Mon Sep 17 00:00:00 2001
From: Robert Haas
Date: Thu, 8 Oct 2015 13:01:36 -0400
Subject: Add BSWAP64 macro.

This is like BSWAP32, but for 64-bit values.  Since we've got two of
them now and they have use cases (like sortsupport) beyond CRCs, move
the definitions to their own header file.

Peter Geoghegan
---
 config/c-compiler.m4 | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'config/c-compiler.m4')

diff --git a/config/c-compiler.m4 b/config/c-compiler.m4
index 9feec0c1086..550d03474c6 100644
--- a/config/c-compiler.m4
+++ b/config/c-compiler.m4
@@ -214,6 +214,24 @@ fi])# PGAC_C_BUILTIN_BSWAP32
 
 
 
+# PGAC_C_BUILTIN_BSWAP64
+# -------------------------
+# Check if the C compiler understands __builtin_bswap64(),
+# and define HAVE__BUILTIN_BSWAP64 if so.
+AC_DEFUN([PGAC_C_BUILTIN_BSWAP64],
+[AC_CACHE_CHECK(for __builtin_bswap64, pgac_cv__builtin_bswap64,
+[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+[static unsigned long int x = __builtin_bswap64(0xaabbccddeeff0011);]
+)],
+[pgac_cv__builtin_bswap64=yes],
+[pgac_cv__builtin_bswap64=no])])
+if test x"$pgac_cv__builtin_bswap64" = xyes ; then
+AC_DEFINE(HAVE__BUILTIN_BSWAP64, 1,
+          [Define to 1 if your compiler understands __builtin_bswap64.])
+fi])# PGAC_C_BUILTIN_BSWAP64
+
+
+
 # PGAC_C_BUILTIN_CONSTANT_P
 # -------------------------
 # Check if the C compiler understands __builtin_constant_p(),
-- 
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