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Yonghong Song d3b522f519 bpf: fix incorrect SELECT_CC lowering 
Commit 37962a331c77 ("bpf: Improve expanding logic in LowerSELECT_CC")
intended to improve code quality for certain jmp conditions. The
commit, however, has a couple of issues:
  (1). In code, just swap is not enough, ConditionalCode CC
       should also be swapped, otherwise incorrect code will
       be generated.
  (2). The ConditionalCode swap should be subject to
       getHasJmpExt(). If getHasJmpExt() is False, certain
       conditional codes will not be supported and swap
       may generate incorrect code.

The original goal for this patch is to optimize jmp operations
which does not have JmpExt turned on. If JmpExt is on,
better code could be generated. For example, the test
select_ri.ll is introduced to demonstrate the optimization.
The same result can be achieved with -mcpu=v2 flag.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 329043
 		2018-04-03 03:56:37 +00:00
clang [AST] Fix some Clang-tidy modernize-use-auto warnings; other minor fixes (NFC). 2018-04-03 00:11:50 +00:00
clang-tools-extra Revert r328932 as it caused Windows and MacOS bot failures. 2018-04-02 18:02:36 +00:00
compiler-rt [profile] Move newly added test to the supported platform 2018-04-02 21:24:07 +00:00
debuginfo-tests [Darwin] Specify DWARF 2/4 when running apple accelerator tests. 2018-02-26 20:56:45 +00:00
libclc remainder: Port from amd builtins 2018-03-19 01:01:10 +00:00
libcxx Fix fs::proximate tests on platforms where /net exists. 2018-04-03 01:52:12 +00:00
libcxxabi [demangler] Fix a bug in r328464 found by oss-fuzz. 2018-03-26 15:34:36 +00:00
libunwind [libunwind][MIPS]: Add support for unwinding in N32 processes. 2018-02-27 21:24:02 +00:00
lld Merge LazyArchive::fetch() and ArchiveFile::getMember(). NFC. 2018-04-03 02:06:57 +00:00
lldb Added a BSD archive tool. 2018-04-02 17:20:21 +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 bpf: fix incorrect SELECT_CC lowering 2018-04-03 03:56:37 +00:00
openmp Minor cleanup in __kmp_atfork_child() 2018-03-30 19:55:11 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly Fix polly build after r328717 2018-03-28 19:56:26 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.