Andrea Di Biagio 44926033f6 [TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is 'free' for the target. ... Now that SimplifyCFG uses TTI for the cost heuristic, we can teach BasicTTIImpl how to query TLI in order to get a more accurate cost for truncates and zero-extends. Before this patch, the basic cost heuristic in TargetTransformInfoImplCRTPBase would have conservatively returned a 'default' TCC_Basic for all zero-extends, and TCC_Free for truncates on native types. This patch improves the heuristic so that we query TLI (if available) to get more accurate answers. If TLI is available, then methods 'isZExtFree' and 'isTruncateFree' can be used to check if a zext/trunc is free for the target. Added more test cases to SimplifyCFG/X86/speculate-cttz-ctlz.ll. With this change, SimplifyCFG is now able to speculate a 'cheap' cttz/ctlz immediately followed by a free zext/trunc. Differential Revision: http://reviews.llvm.org/D7585 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228923 91177308-0d34-0410-b5e6-96231b3b80d8		2015-02-12 14:17:24 +00:00
..
Analysis	Fixed a bug where CFLAA would crash the compiler.	2015-02-12 03:07:07 +00:00
Assembler	AsmParser: Validate alloca's type	2015-02-11 09:13:11 +00:00
Bindings	[OCaml] Add Llvm.build_empty_phi.	2015-02-06 13:42:03 +00:00
Bitcode
BugPoint
CodeGen	AVX-512: Fixed the "test" operation for i1 type	2015-02-12 08:40:34 +00:00
DebugInfo	Add the missing testcase for r228764.	2015-02-10 23:32:56 +00:00
ExecutionEngine
Feature	Don't promote asynch EH invokes of nounwind functions to calls	2015-02-11 01:23:16 +00:00
FileCheck
Instrumentation	tsan: do not instrument not captured values	2015-02-12 09:55:28 +00:00
Integer
JitListener
Linker	Utils: Resolve cycles under distinct MDNodes	2015-02-04 19:44:34 +00:00
LTO
MC	ARM: Fix another regression introduced in r223113	2015-02-12 13:37:28 +00:00
Object
Other	Don't promote asynch EH invokes of nounwind functions to calls	2015-02-11 01:23:16 +00:00
SymbolRewriter
TableGen
tools	Gold-plugin: Broaden scope of get/release_input_file to scope of Module.	2015-02-11 16:12:50 +00:00
Transforms	[TTI] Teach the cost heuristic how to query TLI to check if a zext/trunc is 'free' for the target.	2015-02-12 14:17:24 +00:00
Unit
Verifier	Verifier: Check for null operands in !llvm.module.flags	2015-02-11 09:13:06 +00:00
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg	Remove a gross usage of environment variables in MachineVerifier, replacing it with support for setting the -verify-machineinstrs flag via an environment variable in LIT.	2015-02-04 00:02:59 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh