llvm-project/llvm/lib
Chandler Carruth b143274ad0 [SDAG] Add DEBUG logging to the legalizer, fixing a "bug" found by
inspection in the proccess, and shuffle the logging in the DAG combiner
around a bit.

With this it is much easier to follow what the legalizer is doing. It
should even accurately present most of the strange legalization
operations where a single node is replaced by multiple nodes, etc. There
is still some information lost (we log SDNodes not SDValues so we don't
log which result is used for which thing), but I think this is much
closer to a usable system. Notably, this will make it *much* more
apparant when legalization is actually happening inside the combiner, or
when there is a cycle caused by interactions of the legalizer and the
combiner.

The "bug" I fixed here I'm not sure is remotely possible to trigger. We
were only adding one of the nodes in a replacement to the updated set
rather than all of the nodes in the replacement. Realistically, the
worst result of this are nodes not getting back onto the worklist in the
DAG combiner. I doubt it is possible to trigger this today, and
I certainly don't have any ideas about how, but this at least brings the
code into alignment with the principled operation of the routine.

llvm-svn: 214105
2014-07-28 17:55:07 +00:00
..
Analysis Add @llvm.assume, lowering, and some basic properties 2014-07-25 21:13:35 +00:00
AsmParser AsmParser: remove deprecated LLIR support 2014-07-23 18:09:31 +00:00
Bitcode Bitcode: Don't optimize constants when preserving use-list order 2014-07-25 16:13:16 +00:00
CodeGen [SDAG] Add DEBUG logging to the legalizer, fixing a "bug" found by 2014-07-28 17:55:07 +00:00
DebugInfo Revert "Introduce a string_ostream string builder facilty" 2014-06-26 22:52:05 +00:00
ExecutionEngine Remove dead code. 2014-07-24 16:02:28 +00:00
IR Fix MSVC2012 build error in UseListOrder.cpp 2014-07-25 16:22:13 +00:00
IRReader Update the MemoryBuffer API to use ErrorOr. 2014-07-06 17:43:13 +00:00
LTO AArch64: remove arm64 triple enumerator. 2014-07-23 12:32:47 +00:00
LineEditor [CMake] Use LINK_LIBS instead of target_link_libraries(). 2014-02-26 06:41:29 +00:00
Linker Include <tuple> to make buildbots happy 2014-06-27 18:38:12 +00:00
MC Reapply "DebugInfo: Don't put fission type units in comdat sections." 2014-07-25 17:11:58 +00:00
Object AArch64: remove arm64 triple enumerator. 2014-07-23 12:32:47 +00:00
Option Generic: add range-adapter for option parsing. 2014-07-09 13:03:37 +00:00
ProfileData coverage: remove empty mapping regions 2014-07-25 22:22:24 +00:00
Support Remove dead code. 2014-07-25 19:06:39 +00:00
TableGen [TableGen] Allow shift operators to take bits<n> 2014-07-17 17:04:27 +00:00
Target R600/SI: Implement getOptimalMemOpType 2014-07-28 17:49:26 +00:00
Transforms Canonicalization for @llvm.assume 2014-07-25 21:45:17 +00:00
CMakeLists.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
LLVMBuild.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
Makefile ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00