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Andrea Di Biagio f033db57e9 [TTI] Improved cost heuristic for cttz/ctlz calls. 
This patch is a follow-up of r228826 (see code-review: D7506).

Now that SimplifyCFG uses TargetTransformInfo for cost analysis, we 
have to fix the cost heuristic for intrinsic calls to cttz/ctlz.

This patch defines method 'getIntrinsicCost' in BasicTTIImpl: now, BasicTTIImpl
queries TLI to check if a call to cttz/ctlz is cheap for the target.

Added test cases in Transforms/SimplifyCFG/X86 to verify that on x86,
SimplifyCFG only speculates a call to cttz/ctlz if it is cheap.

Differential Revision: http://reviews.llvm.org/D7554


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228829 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-11 14:22:18 +00:00
autoconf Fix some bashims. More information on https://wiki.ubuntu.com/DashAsBinSh. Reported initially on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772302 & https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772301 2015-02-01 14:55:43 +00:00
bindings [OCaml] Add Llvm.build_empty_phi. 2015-02-06 13:42:03 +00:00
cmake Teach llvm_add_library() to find include dirs. 2015-02-10 05:04:37 +00:00
docs Don't promote asynch EH invokes of nounwind functions to calls 2015-02-11 01:23:16 +00:00
examples [Orc] Add a JITSymbol class to the Orc APIs, refactor APIs, update clients. 2015-02-09 01:20:51 +00:00
include [TTI] Improved cost heuristic for cttz/ctlz calls. 2015-02-11 14:22:18 +00:00
lib [SimplifyCFG] Swap to using TargetTransformInfo for cost 2015-02-11 12:15:41 +00:00
projects
test [TTI] Improved cost heuristic for cttz/ctlz calls. 2015-02-11 14:22:18 +00:00
tools Oops. Don't call Windows functions on non-windows. 2015-02-10 22:47:14 +00:00
unittests Fix warning due to unused private member variable. 2015-02-11 00:33:00 +00:00
utils [emacs] Get llvm-mode to font-lock "personality" 2015-02-09 00:30:03 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt Revert "Raising minimum required CMake version to 2.8.12.2." 2015-02-09 22:07:49 +00:00
CODE_OWNERS.TXT Assume code ownership for the PS4 to ensure patches get reviewed, per the Developer Policy. 2015-01-28 18:33:39 +00:00
configure Fix some bashims. More information on https://wiki.ubuntu.com/DashAsBinSh. Reported initially on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772302 & https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=772301 2015-02-01 14:55:43 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile
Makefile.common
Makefile.config.in
Makefile.rules
README.txt Revert test commit 2015-02-04 18:46:00 +00:00

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