Hal Finkel 9779454568 Improve BasicAA CS-CS queries (redux) ... This reverts, "r213024 - Revert r212572 "improve BasicAA CS-CS queries", it causes PR20303." with a fix for the bug in pr20303. As it turned out, the relevant code was both wrong and over-conservative (because, as with the code it replaced, it would return the overall ModRef mask even if just Ref had been implied by the argument aliasing results). Hopefully, this correctly fixes both problems. Thanks to Nick Lewycky for reducing the test case for pr20303 (which I've cleaned up a little and added in DSE's test directory). The BasicAA test has also been updated to check for this error. Original commit message: BasicAA contains knowledge of certain intrinsics, such as memcpy and memset, and uses that information to form more-accurate answers to CallSite vs. Loc ModRef queries. Unfortunately, it did not use this information when answering CallSite vs. CallSite queries. Generically, when an intrinsic takes one or more pointers and the intrinsic is marked only to read/write from its arguments, the offset/size is unknown. As a result, the generic code that answers CallSite vs. CallSite (and CallSite vs. Loc) queries in AA uses UnknownSize when forming Locs from an intrinsic's arguments. While BasicAA's CallSite vs. Loc override could use more-accurate size information for some intrinsics, it did not do the same for CallSite vs. CallSite queries. This change refactors the intrinsic-specific logic in BasicAA into a generic AA query function: getArgLocation, which is overridden by BasicAA to supply the intrinsic-specific knowledge, and used by AA's generic implementation. This allows the intrinsic-specific knowledge to be used by both CallSite vs. Loc and CallSite vs. CallSite queries, and simplifies the BasicAA implementation. Currently, only one function, Mac's memset_pattern16, is handled by BasicAA (all the rest are intrinsics). As a side-effect of this refactoring, BasicAA's getModRefBehavior override now also returns OnlyAccessesArgumentPointees for this function (which is an improvement). llvm-svn: 213219		2014-07-17 01:28:25 +00:00
..
Analysis	Improve BasicAA CS-CS queries (redux)	2014-07-17 01:28:25 +00:00
Assembler
Bindings
Bitcode	Roundtrip the inalloca bit on allocas through bitcode	2014-07-16 01:34:27 +00:00
BugPoint	llvm/test/BugPoint/compile-custom.ll: Use explicit %python to invoke a test script, compile-custom.ll.py, for shebang-incapable hosts.	2014-07-11 14:44:10 +00:00
CodeGen	Fixed formatting, removed bug reference, renamed testcase	2014-07-16 22:40:28 +00:00
DebugInfo	Try out FileCheck's new (in r212810) -implicit-check-not in a DebugInfo test.	2014-07-15 21:06:37 +00:00
ExecutionEngine	[RuntimeDyld] Replace a crufty old ARM RuntimeDyld test with a new one that uses	2014-07-10 23:29:11 +00:00
Feature	IR: Allow comdats to be applied to globals with internal linkage	2014-07-13 04:56:11 +00:00
FileCheck	Add FileCheck -implicit-check-not option to allow stricter tests without adding too many CHECK-NOTs manually.	2014-07-11 12:39:32 +00:00
Instrumentation	CHECK-LABEL-ize one test	2014-07-16 18:11:31 +00:00
Integer
JitListener
Linker
LTO
MC	[AArch64] Add negative tests for the SIMD & FP LDP instructions.	2014-07-15 16:33:24 +00:00
Object	Add the "-x" flag to llvm-nm for Mach-O files that prints the fields of a symbol in hex.	2014-07-16 17:38:26 +00:00
Other	IR: Fold away compares between GV GEPs and GVs	2014-07-04 22:05:26 +00:00
TableGen
tools	llvm-objdump: Handle BSS sections larger than the object file	2014-07-14 16:20:14 +00:00
Transforms	Improve BasicAA CS-CS queries (redux)	2014-07-17 01:28:25 +00:00
Unit	Let test/Unit/lit.cfg add config.shlibdir to $PATH on DLL platforms like cygming.	2014-07-04 05:11:55 +00:00
Verifier	IR: Allow comdats to be applied to globals with internal linkage	2014-07-13 04:56:11 +00:00
YAMLParser
.clang-format
CMakeLists.txt
lit.cfg	llvm/test/lit.cfg: Let %python available.	2014-07-11 14:36:39 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh