Jakob Stoklund Olesen 6bfba2e5af Prefer cheap registers for busy live ranges. ...

On the x86-64 and thumb2 targets, some registers are more expensive to encode
than others in the same register class.

Add a CostPerUse field to the TableGen register description, and make it
available from TRI->getCostPerUse. This represents the cost of a REX prefix or a
32-bit instruction encoding required by choosing a high register.

Teach the greedy register allocator to prefer cheap registers for busy live
ranges (as indicated by spill weight).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129864 91177308-0d34-0410-b5e6-96231b3b80d8

2011-04-20 18:19:48 +00:00

..

Analysis

Use ArrayRef variants.

2011-04-18 23:51:03 +00:00

Archive

Revert PathV2 changes, as sys::fs::unique_file is not finished yet.

2011-03-01 19:50:55 +00:00

AsmParser

Revert r129235 pending a vetting of the EH rewrite.

2011-04-10 23:18:04 +00:00

Bitcode

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

CodeGen

Prefer cheap registers for busy live ranges.

2011-04-20 18:19:48 +00:00

CompilerDriver

Build CompilerDriver library.

2011-03-12 22:01:42 +00:00

ExecutionEngine

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

Linker

Set the unnamed_addr only when we're creating a new GV in the dest module.

2011-03-29 23:31:06 +00:00

MC

Behave like gnu as when a relocation crosses sections.

2011-04-20 14:01:45 +00:00

Object

Start migrating mach-o dumping facilities to the object file out of a

2011-04-03 23:51:47 +00:00

Support

sys/Host: Change getHostTriple() to return the full Darwin version on OS X.

2011-04-20 15:44:33 +00:00

Target

Prefer cheap registers for busy live ranges.

2011-04-20 18:19:48 +00:00

Transforms

Trivial simplification.

2011-04-19 15:23:29 +00:00

VMCore

Fix a ton of comment typos found by codespell. Patch by

2011-04-15 05:18:47 +00:00

CMakeLists.txt

Build CompilerDriver library.

2011-03-12 22:01:42 +00:00

Makefile

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