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164cd0161e
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Zinovy Nis 164cd0161e [INDVARS] Extend using of widening of induction variables for the cases of "sub nsw" and "mul nsw" instructions. 
Currently only "add nsw" are widened. This patch eliminates tons of "sext" instructions for 64 bit code (and the corresponding target code) in cases like:

int N = 100;
float **A;

void foo(int x0, int x1)
{
        float * A_cur = &A[0][0];
        float * A_next = &A[1][0];
        for(int x = x0; x < x1; ++x).
        {
          // Currently only [x+N] case is widened. Others 2 cases lead to sext.
          // This patch fixes it, so all 3 cases do not need sext.
          const float div = A_cur[x + N] + A_cur[x - N] + A_cur[x * N];
          A_next[x] = div;
        }
}
...
> clang++ test.cpp -march=core-avx2 -Ofast  -fno-unroll-loops -fno-tree-vectorize -S -o -

Differential Revision: http://reviews.llvm.org/D4695



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216160 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 08:25:45 +00:00
autoconf Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
bindings [OCaml] Expose Llvm.get_operand_use. 2014-08-12 02:55:45 +00:00
cmake Disabling an MSVC warning ('var' : definition from the for loop is ignored; the definition from the enclosing scope is used) which will trigger false positives more than true positives. 2014-08-18 14:54:22 +00:00
docs Add note to LangRef about how function arguments can be unnamed and 2014-08-20 15:06:30 +00:00
examples Make it explicit that ExecutionEngine takes ownership of the modules. 2014-08-19 04:04:25 +00:00
include Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size. 2014-08-21 05:55:13 +00:00
lib [INDVARS] Extend using of widening of induction variables for the cases of "sub nsw" and "mul nsw" instructions. 2014-08-21 08:25:45 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [INDVARS] Extend using of widening of induction variables for the cases of "sub nsw" and "mul nsw" instructions. 2014-08-21 08:25:45 +00:00
tools IntelJITEventListener updates to fix breaks by recent changes to EngineBuilder and DIContext. 2014-08-21 07:01:55 +00:00
unittests IntelJITEventListener updates to fix breaks by recent changes to EngineBuilder and DIContext. 2014-08-21 07:01:55 +00:00
utils Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size. 2014-08-21 05:55:13 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Add Polly to the ignored trees. 2014-06-25 13:13:36 +00:00
CMakeLists.txt Fix building with in-tree libc++abi on FreeBSD 2014-08-01 19:23:15 +00:00
CODE_OWNERS.TXT Add a sentence that all entries should include an email address. 2014-08-04 19:33:25 +00:00
configure Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
CREDITS.TXT add self to credits 2014-08-21 04:27:11 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Track clang r213171 2014-07-16 16:50:34 +00:00
Makefile.rules Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.