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Given a gcc-compatible xlc compiler, prefer xlc-style atomics.

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This evades a ppc64le "IBM XL C/C++ for Linux" compiler bug.  Back-patch
to 9.5, where the atomics facility was introduced.
This commit is contained in:
Noah Misch 2015-07-08 20:44:21 -04:00
parent 0d32d2e693
commit 1e700e0fa0
1 changed files with 8 additions and 3 deletions
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11
src/include/port/atomics.h
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@ -81,8 +81,15 @@
* * pg_atomic_compare_exchange_u32(), pg_atomic_fetch_add_u32()
* using compiler intrinsics are a good idea.
*/
/*
* Given a gcc-compatible xlc compiler, prefer the xlc implementation. The
* ppc64le "IBM XL C/C++ for Linux, V13.1.2" implements both interfaces, but
* __sync_lock_test_and_set() of one-byte types elicits SIGSEGV.
*/
#if defined(__IBMC__) || defined(__IBMCPP__)
#include "port/atomics/generic-xlc.h"
/* gcc or compatible, including clang and icc */
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
#elif defined(__GNUC__) || defined(__INTEL_COMPILER)
#include "port/atomics/generic-gcc.h"
#elif defined(WIN32_ONLY_COMPILER)
#include "port/atomics/generic-msvc.h"
@ -90,8 +97,6 @@
#include "port/atomics/generic-acc.h"
#elif defined(__SUNPRO_C) && !defined(__GNUC__)
#include "port/atomics/generic-sunpro.h"
#elif (defined(__IBMC__) || defined(__IBMCPP__)) && !defined(__GNUC__)
#include "port/atomics/generic-xlc.h"
#else
/*
* Unsupported compiler, we'll likely use slower fallbacks... At least