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Ulrich Weigand eaf0051ba3 [SystemZ] Remove unnecessary serialization before volatile loads 
This reverts the use of TargetLowering::prepareVolatileOrAtomicLoad
introduced by r196905.  Nothing in the semantics of the "volatile"
keyword or the definition of the z/Architecture actually requires
that volatile loads are preceded by a serialization operation, and
no other compiler on the platform actually implements this.

Since we've now seen a use case where this additional serialization
causes noticable performance degradation, this patch removes it.

The patch still leaves in the serialization before atomic loads,
which is now implemented directly in lowerATOMIC_LOAD.  (This also
seems overkill, but that can be addressed separately.)

llvm-svn: 306117
 		2017-06-23 15:56:14 +00:00
clang Sort the autocomplete candidates before printing them out. 2017-06-23 15:37:52 +00:00
clang-tools-extra [clang-tidy] Fix a false positive in modernize-use-nullptr. 2017-06-23 09:36:49 +00:00
compiler-rt [Sanitizers] 32 bit allocator respects allocator_may_return_null flag 2017-06-22 00:02:37 +00:00
debuginfo-tests Add a test for PR33166. 2017-05-25 19:33:16 +00:00
libclc generic: add missing get_work_dim include 2017-06-02 15:58:35 +00:00
libcxx Implement inclusive_scan/transform_inclusive_scan for C++17. 2017-06-23 05:12:42 +00:00
libcxxabi Add some catch(...) blocks to the tests so that if they fail, we get a good error message. No functional change. 2017-06-22 00:49:03 +00:00
libunwind Change -1LL to -1ULL to silence a gcc warning about left shifting a negative value. Fixes https://bugs.llvm.org/show_bug.cgi?id=33358 2017-06-21 16:02:53 +00:00
lld [COFF] Fix SECTION and SECREL relocation handling for absolute symbols 2017-06-22 23:33:04 +00:00
lldb Simplify the gdb-remote unit tests 2017-06-22 15:54:21 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm [SystemZ] Remove unnecessary serialization before volatile loads 2017-06-23 15:56:14 +00:00
openmp Set affinity to none/false in child processes 2017-06-15 21:51:07 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly Bail out early in case we see an invalid runtime context in buildAliasGroups 2017-06-23 08:05:31 +00:00