clang-p2996

Files

Vedant Kumar dbbdda4d23 [ubsan] Skip null checks if they are constant-folded away

The IR builder can constant-fold null checks if the pointer operand
points to a constant. If the "is-non-null" check is folded away to
"true", don't emit the null check + branch.

Testing: check-clang, check-ubsan.

This slightly reduces the amount of null checks we emit when compiling
X86ISelLowering.cpp. Here are the numbers from patched/unpatched clangs
based on r300371.

  -------------------------------------
  | Setup          | # of null checks |
  -------------------------------------
  | unpatched, -O0 |            25251 |
  | patched, -O0   |            23925 | (-5.3%)
  -------------------------------------

llvm-svn: 300509

2017-04-17 22:26:10 +00:00

bindings

[libclang] [OpenCL] Expose half type.

2017-02-10 15:51:11 +00:00

cmake

[CMake] Support building Fuchsia toolchain on Darwin

2017-04-13 21:09:42 +00:00

docs

[docs] UBSan: Mention that print_stacktrace=1 is unsupported on Darwin

2017-04-14 01:59:44 +00:00

examples

Add LLVMOption to clang-interpreter, corresponding to r291938.

2017-01-14 08:54:05 +00:00

include

[coroutines] Fix rebuilding of implicit and dependent coroutine statements.

2017-04-17 22:06:13 +00:00

INPUTS

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lib

[ubsan] Skip null checks if they are constant-folded away

2017-04-17 22:26:10 +00:00

runtime

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test

[ubsan] Skip null checks if they are constant-folded away

2017-04-17 22:26:10 +00:00

tools

clang-format-vs licence.txt: drop svn:executable

2017-04-13 20:09:18 +00:00

unittests

[clang-format] Recognize Java logical shift assignment operator

2017-04-11 15:50:04 +00:00

utils

[NFC, Scoped Enum] Convert Sema::ExpressionEvaluationContext into a scoped Enum

2017-04-01 21:30:49 +00:00

www

Implement DR 373 "Lookup on namespace qualified name in using-directive"

2017-03-17 21:41:20 +00:00

.arcconfig

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.clang-format

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.clang-tidy

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.gitignore

…

CMakeLists.txt

[analyzer] Add new Z3 constraint manager backend

2017-04-04 19:52:25 +00:00

CODE_OWNERS.TXT

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INSTALL.txt

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LICENSE.TXT

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ModuleInfo.txt

…

NOTES.txt

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README.txt

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README.txt

//===----------------------------------------------------------------------===//
// C Language Family Front-end
//===----------------------------------------------------------------------===//

Welcome to Clang.  This is a compiler front-end for the C family of languages
(C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM
compiler infrastructure project.

Unlike many other compiler frontends, Clang is useful for a number of things
beyond just compiling code: we intend for Clang to be host to a number of
different source-level tools.  One example of this is the Clang Static Analyzer.

If you're interested in more (including how to build Clang) it is best to read
the relevant web sites.  Here are some pointers:

Information on Clang:              http://clang.llvm.org/
Building and using Clang:          http://clang.llvm.org/get_started.html
Clang Static Analyzer:             http://clang-analyzer.llvm.org/
Information on the LLVM project:   http://llvm.org/

If you have questions or comments about Clang, a great place to discuss them is
on the Clang development mailing list:
  http://lists.llvm.org/mailman/listinfo/cfe-dev

If you find a bug in Clang, please file it in the LLVM bug tracker:
  http://llvm.org/bugs/