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Hal Finkel 64fa501b10 Apply the InstCombine fptrunc sqrt optimization to llvm.sqrt 
InstCombine, in visitFPTrunc, applies the following optimization to sqrt calls:

  (fptrunc (sqrt (fpext x))) -> (sqrtf x)

but does not apply the same optimization to llvm.sqrt. This is a problem
because, to enable vectorization, Clang generates llvm.sqrt instead of sqrt in
fast-math mode, and because this optimization is being applied to sqrt and not
applied to llvm.sqrt, sometimes the fast-math code is slower.

This change makes InstCombine apply this optimization to llvm.sqrt as well.

This fixes the specific problem in PR17758, although the same underlying issue
(optimizations applied to libcalls are not applied to intrinsics) exists for
other optimizations in SimplifyLibCalls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194935 91177308-0d34-0410-b5e6-96231b3b80d8
2013-11-16 21:29:08 +00:00
autoconf [autoconf] Prune "runtime" stuff in configure, corresponding to r191835. 2013-11-11 13:53:52 +00:00
bindings [OCaml] Add Target and TargetMachine bindings to Llvm_target 2013-11-15 02:51:57 +00:00
cmake Revert my CMake patches concerning building with /MT (r194589, r194596) 2013-11-13 20:29:10 +00:00
docs Mention address space related changes in release notes. 2013-11-16 00:36:46 +00:00
examples [weak vtables] Remove a bunch of weak vtables 2013-11-15 22:34:48 +00:00
include ScalarEvolution: Warn if the result of setFlags/clearFlags is unused. 2013-11-16 16:25:47 +00:00
lib Apply the InstCombine fptrunc sqrt optimization to llvm.sqrt 2013-11-16 21:29:08 +00:00
projects Revert "Revert "Windows: Add support for unicode command lines"" 2013-10-07 01:00:07 +00:00
test Apply the InstCombine fptrunc sqrt optimization to llvm.sqrt 2013-11-16 21:29:08 +00:00
tools [weak vtables] Remove a bunch of weak vtables 2013-11-15 22:34:48 +00:00
unittests [weak vtables] Remove a bunch of weak vtables 2013-11-15 22:34:48 +00:00
utils gtest-death-test.cc: Move ~DeathTestFactory() to unbreak cygming build since r194865. 2013-11-16 05:26:49 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.clang-format Add a clang-format file so that the tool can automatically detect the 2013-09-02 07:19:04 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt Revert my CMake patches concerning building with /MT (r194589, r194596) 2013-11-13 20:29:10 +00:00
CODE_OWNERS.TXT Update contact information. 2013-11-15 17:35:29 +00:00
configure [autoconf] Prune "runtime" stuff in configure, corresponding to r191835. 2013-11-11 13:53:52 +00:00
CREDITS.TXT Update contact information. 2013-11-15 17:35:29 +00:00
LICENSE.TXT Be more specific and capitalize filenames. 2013-05-21 21:22:34 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add an autoconf option for turning on -gsplit-dwarf by default 2013-06-25 01:12:25 +00:00
Makefile.rules Teach the Makefile build system how to handle SOURCES which include 2013-11-14 23:51:29 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
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