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Guozhi Wei 7c67009fe5 [DAGCombine] Don't combine sext with extload if sextload is not supported and extload has multi users 
In function DAGCombiner::visitSIGN_EXTEND_INREG, sext can be combined with extload even if sextload is not supported by target, then

  if sext is the only user of extload, there is no big difference, no harm no benefit.
  if extload has more than one user, the combined sextload may block extload from combining with other zext, causes extra zext instructions generated. As demonstrated by the attached test case.

This patch add the constraint that when sextload is not supported by target, sext can only be combined with extload if it is the only user of extload.

Differential Revision: https://reviews.llvm.org/D39108

llvm-svn: 316802
 		2017-10-27 21:54:24 +00:00
..
Analysis Improve clamp recognition in ValueTracking. 2017-10-27 20:53:41 +00:00
AsmParser Represent runtime preemption in the IR. 2017-10-26 15:00:26 +00:00
BinaryFormat Simplify. 2017-10-19 01:32:18 +00:00
Bitcode Represent runtime preemption in the IR. 2017-10-26 15:00:26 +00:00
CodeGen [DAGCombine] Don't combine sext with extload if sextload is not supported and extload has multi users 2017-10-27 21:54:24 +00:00
DebugInfo Fix BB after r316756 "[llvm-dwarfdump] - Teach verifier to report broken DWARF expressions." 2017-10-27 10:58:04 +00:00
Demangle [ItaniumDemangle] Fix a exponential string copying bug 2017-05-28 23:24:52 +00:00
ExecutionEngine ExecutionEngine: make COFF Thumb2 assertions non-tautological 2017-10-22 20:51:25 +00:00
FuzzMutate FuzzMutate: Fix arch parsing in FuzzerCLI 2017-10-17 02:39:40 +00:00
Fuzzer [libFuzzer] Delete llvm/lib/Fuzzer 2017-10-16 20:48:19 +00:00
IR [LLVM-C] Publicly expose getters of MetadataType, TokenType 2017-10-27 11:51:40 +00:00
IRReader Move the stripping of invalid debug info from the Verifier to AutoUpgrade. 2017-10-02 18:31:29 +00:00
LTO [raw_fd_ostream] report actual error in error messages 2017-10-24 01:26:22 +00:00
LineEditor
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Linker Linker: Create a function declaration when moving a non-prevailing alias of function type. 2017-08-10 01:07:44 +00:00
MC [WebAssembly] MC: Don't allow zero sized data segments 2017-10-27 00:08:55 +00:00
Object Make 32-bit member offset in Archive::Symbol::getMember 64-bit 2017-10-27 21:47:38 +00:00
ObjectYAML llvm-readobj: Add support for reading relocations in the Android packed format. 2017-10-25 03:37:12 +00:00
Option Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
Passes Add CalledValuePropagation pass 2017-10-25 13:40:08 +00:00
ProfileData [Coverage] Provide a stable order for getInstantiationGroups 2017-10-24 22:35:29 +00:00
Support Fix llvm-special-case-list-fuzzer regexp exception 2017-10-27 19:15:13 +00:00
TableGen Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
Target Handle undefined weak hidden symbols on all architectures. 2017-10-27 21:18:48 +00:00
Testing Force #define GTEST_LANG_CXX11. 2017-10-27 21:12:28 +00:00
ToolDrivers [COFF] Improve the check for functions that should get an extra underscore 2017-10-23 09:08:13 +00:00
Transforms [LoopPredication] Handle the case when the guard and the latch IV have different offsets 2017-10-27 14:46:17 +00:00
WindowsManifest Fix bug 34608 by moving private header out of public header. 2017-09-14 23:01:13 +00:00
XRay [XRay][tools] Support arg1 logging entries in the basic logging mode 2017-10-05 05:18:17 +00:00
CMakeLists.txt Moving libFuzzer from LLVM to compiler-rt. 2017-08-21 23:25:12 +00:00
LLVMBuild.txt Re-apply "Introduce FuzzMutate library" 2017-08-21 22:57:06 +00:00