Chandler Carruth 10cd8098a7 [x86] Teach the instruction lowering to add comments describing constant ... pool data being loaded into a vector register. The comments take the form of: # ymm0 = [a,b,c,d,...] # xmm1 = <x,y,z...> The []s are used for generic sequential data and the <>s are used for specifically ConstantVector loads. Undef elements are printed as the letter 'u', integers in decimal, and floating point values as floating point values. Suggestions on improving the formatting or other aspects of the display are very welcome. My primary use case for this is to be able to FileCheck test masks passed to vector shuffle instructions in-register. It isn't fantastic for that (no decoding special zeroing semantics or other tricks), but it at least puts the mask onto an instruction line that could reasonably be checked. I've updated many of the new vector shuffle lowering tests to leverage this in their test cases so that we're actually checking the shuffle masks remain as expected. Before implementing this, I tried a *bunch* of different approaches. I looked into teaching the MCInstLower code to scan up the basic block and find a definition of a register used in a shuffle instruction and then decode that, but this seems incredibly brittle and complex. I talked to Hal a lot about the "right" way to do this: attach the raw shuffle mask to the instruction itself in some form of unencoded operands, and then use that to emit the comments. I still think that's the optimal solution here, but it proved to be beyond what I'm up for here. In particular, it seems likely best done by completing the plumbing of metadata through these layers and attaching the shuffle mask in metadata which could have fully automatic dropping when encoding an actual instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218377 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-24 09:39:41 +00:00
..
Analysis	Add two thresholds lvi-overdefined-BB-threshold and lvi-overdefined-threshold	2014-09-22 02:23:05 +00:00
AsmParser
Bitcode	Do not destroy external linkage when deleting function body	2014-09-23 12:54:19 +00:00
CodeGen	Clear PreferredExtendType for in each function-specific state FunctionLoweringInfo.	2014-09-24 03:22:56 +00:00
DebugInfo	[dwarfdump] Dump full filenames as DW_AT_(decl|call)_file attribute values	2014-09-22 12:36:04 +00:00
ExecutionEngine	[MCJIT] Fix some more RuntimeDyld debugging output format specifiers.	2014-09-23 19:20:57 +00:00
IR	DIBuilder: Delete dead code, NFC	2014-09-19 23:17:58 +00:00
IRReader
LineEditor
Linker
LTO
MC	Downgrade DWARF2 section limit error to a warning	2014-09-22 10:45:16 +00:00
Object	Converting object's error_category to a ManagedStatic to avoid static constructors and destructors.	2014-09-19 22:09:18 +00:00
Option
ProfileData	llvm-cov: Allow creating CoverageMappings from filenames	2014-09-20 17:19:52 +00:00
Support	Windows/Host.inc: Reformat the header to fit 80-col.	2014-09-24 04:45:14 +00:00
TableGen
Target	[x86] Teach the instruction lowering to add comments describing constant	2014-09-24 09:39:41 +00:00
Transforms	Allow BB duplication threshold to be adjusted through JumpThreading's ctor	2014-09-24 04:59:06 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile