Chandler Carruth a6f9501b62 [x86] Add a much more powerful framework for combining x86 shuffle ... instructions in the legalized DAG, and leverage it to combine long sequences of instructions to PSHUFB. Eventually, the other x86-instruction-specific shuffle combines will probably all be driven out of this routine. But the real motivation is to detect after we have fully legalized and optimized a shuffle to the minimal number of x86 instructions whether it is profitable to replace the chain with a fully generic PSHUFB instruction even though doing so requires either a load from a constant pool or tying up a register with the mask. While the Intel manuals claim it should be used when it replaces 5 or more instructions (!!!!) my experience is that it is actually very fast on modern chips, and so I've gon with a much more aggressive model of replacing any sequence of 3 or more instructions. I've also taught it to do some basic canonicalization to special-purpose instructions which have smaller encodings than their generic counterparts. There are still quite a few FIXMEs here, and I've not yet implemented support for lowering blends with PSHUFB (where its power really shines due to being able to zero out lanes), but this starts implementing real PSHUFB support even when using the new, fancy shuffle lowering. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214042 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-27 01:15:58 +00:00
..
Analysis	Add @llvm.assume, lowering, and some basic properties	2014-07-25 21:13:35 +00:00
Assembler	Rename metadata llvm.loop.vectorize.unroll to llvm.loop.vectorize.interleave.	2014-07-21 23:11:03 +00:00
Bindings	[OCaml] Don't truncate constants over 32 bits in Llvm.const_int.	2014-07-22 13:55:20 +00:00
Bitcode	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
BugPoint
CodeGen	[x86] Add a much more powerful framework for combining x86 shuffle	2014-07-27 01:15:58 +00:00
DebugInfo	Reapply "DebugInfo: Don't put fission type units in comdat sections."	2014-07-25 17:11:58 +00:00
ExecutionEngine	[RuntimeDyld][AArch64] Update relocation tests and also add a simple GOT test.	2014-07-23 22:23:17 +00:00
Feature
FileCheck
Instrumentation	[ASan] Don't instrument load/stores with !nosanitize metadata.	2014-07-17 18:48:12 +00:00
Integer
JitListener
Linker
LTO
MC	[X86] Add comments to clarify some non-obvious lines in the stackmap-nops.ll	2014-07-25 04:50:08 +00:00
Object	Add an implementation for llvm-nm’s -print-file-name option (aka -o and -A).	2014-07-24 23:31:52 +00:00
Other
TableGen	Revert of r213521. This change introduced a non-hermetic test (depending on a	2014-07-22 02:32:12 +00:00
tools	llvm-vtabledump: A vtable dumper	2014-07-24 23:14:40 +00:00
Transforms	Canonicalization for @llvm.assume	2014-07-25 21:45:17 +00:00
Unit
Verifier
YAMLParser
.clang-format
CMakeLists.txt	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
lit.cfg	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh