Hal Finkel 4e703f82f2 [PowerPC] Add a DAGToDAG peephole to remove unnecessary zero-exts ... On PPC64, we end up with lots of i32 -> i64 zero extensions, not only from all of the usual places, but also from the ABI, which specifies that values passed are zero extended. Almost all 32-bit PPC instructions in PPC64 mode are defined to do *something* to the higher-order bits, and for some instructions, that action clears those bits (thus providing a zero-extended result). This is especially common after rotate-and-mask instructions. Adding an additional instruction to zero-extend the results of these instructions is unnecessary. This PPCISelDAGToDAG peephole optimization examines these zero-extensions, and looks back through their operands to see if all instructions will implicitly zero extend their results. If so, we convert these instructions to their 64-bit variants (which is an internal change only, the actual encoding of these instructions is the same as the original 32-bit ones) and remove the unnecessary zero-extension (changing where the INSERT_SUBREG instructions are to make everything internally consistent). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224169 91177308-0d34-0410-b5e6-96231b3b80d8		2014-12-12 23:59:36 +00:00
..
Analysis	BFI: Saturate when combining edges to a successor	2014-12-05 19:13:42 +00:00
Assembler	AsmParser: Don't crash on an ill-formed MDNodeVector	2014-12-11 20:51:54 +00:00
Bindings
Bitcode	Bitcode: Use unsigned char to record MDStrings	2014-12-11 23:34:30 +00:00
BugPoint
CodeGen	[PowerPC] Add a DAGToDAG peephole to remove unnecessary zero-exts	2014-12-12 23:59:36 +00:00
DebugInfo	A fix for PR21176.	2014-12-12 05:11:47 +00:00
ExecutionEngine
Feature	Fix LLVMContext to match what MDKind names that the LL parser permits. Fixes PR21799!	2014-12-11 02:10:28 +00:00
FileCheck
Instrumentation	[ASan] Change fake stack and local variables handling.	2014-12-11 21:53:03 +00:00
Integer
JitListener
Linker	IR: Canonicalize metadata formatting, NFC	2014-12-11 06:32:29 +00:00
LTO	Lazily link GlobalVariables and GlobalAliases.	2014-12-08 18:45:16 +00:00
MC	[Hexagon] Adding double word add/min/minu/max/maxu instructions and tests.	2014-12-12 21:29:25 +00:00
Object
Other
SymbolRewriter
TableGen
tools	Relax debug-map-parsing.test error message check for Windows	2014-12-12 18:52:07 +00:00
Transforms	ValueTracking: Don't recurse too deeply in computeKnownBitsFromAssume	2014-12-12 23:59:29 +00:00
Unit
Verifier	IR: Canonicalize metadata formatting, NFC	2014-12-11 06:32:29 +00:00
YAMLParser
.clang-format
CMakeLists.txt	Revert r224149, llvm-dsymutil was already here.	2014-12-12 21:25:07 +00:00
lit.cfg	Initial dsymutil tool commit.	2014-12-12 17:31:24 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh