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Craig Topper 8f77dcadff Recommit r333226 "[ValueTracking] Teach computeKnownBits that the result of an absolute value pattern that uses nsw flag is always positive." 
Libfuzzer tests have been fixed to prevent being optimized.

Original commit message:

If the nsw flag is used in the absolute value then it is undefined for INT_MIN. For all other value it will produce a positive number. So we can assume the result is positive.

This breaks some InstCombine abs/nabs combining tests because we simplify the second compare from known bits rather than as the whole pattern. Looks like we can probably fix it by adding a neg+abs/nabs combine to just swap the select operands. N

Differential Revision: https://reviews.llvm.org/D47041

llvm-svn: 333300
 		2018-05-25 19:18:09 +00:00
clang Follow-up fix for nonnull atomic non-member functions 2018-05-25 17:36:49 +00:00
clang-tools-extra [clangd] Temporarily disable the test that crashes under asan. 2018-05-25 14:55:18 +00:00
compiler-rt [libFuzzer] Avoid optimization of "abs(x) < 0" 2018-05-25 18:27:12 +00:00
debuginfo-tests [Darwin] Specify DWARF 2/4 when running apple accelerator tests. 2018-02-26 20:56:45 +00:00
libclc Add initial support for half precision builtins 2018-05-17 22:55:30 +00:00
libcxx Add one more test for optional 2018-05-25 02:22:54 +00:00
libcxxabi private_typeinfo: limit is_dst_type_derived_from_static_type optimization 2018-05-18 20:51:38 +00:00
libunwind [OR1K] Add the EPCR special-purpose register to register state. 2018-05-16 19:09:48 +00:00
lld Fix a bug that we truncated GOTPLT entries to 32 bits. 2018-05-25 18:26:14 +00:00
lldb Fix typo in CMake comments 2018-05-25 18:59:21 +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 Recommit r333226 "[ValueTracking] Teach computeKnownBits that the result of an absolute value pattern that uses nsw flag is always positive." 2018-05-25 19:18:09 +00:00
openmp [libomptarget-nvptx] loop: Determine if runtime uninitialized 2018-05-25 15:56:48 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [Acc] Followup for r333105: Fix one additional testcase 2018-05-24 10:18:09 +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.