[PATCH] D78416: [docs][NFC] Mention FastISel as a default instruction selector for X86 target

[Shivam Gupta via Phabricator via llvm-commits]

xgupta created this revision.
xgupta added reviewers: rnk, gribozavr.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Mention Instruction Selectors in LLVM and default instruction selector for X86 target at -O0.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78416

Files:
  llvm/docs/CodeGenerator.rst


Index: llvm/docs/CodeGenerator.rst
===================================================================
--- llvm/docs/CodeGenerator.rst
+++ llvm/docs/CodeGenerator.rst
@@ -719,9 +719,11 @@
 ---------------------
 
 Instruction Selection is the process of translating LLVM code presented to the
-code generator into target-specific machine instructions.  There are several
-well-known ways to do this in the literature.  LLVM uses a SelectionDAG based
-instruction selector.
+code generator into target-specific machine instructions.  There are several 
+well-known ways to do this in the literature.  LLVM have three types of 
+instruction selector.  1. SelectionDAG 2. FastIsel 3. GlobalIsel
+FastIsel is the default instruction selector for X86 target.  GlobalIsel is 
+intended to be a replacement of SelectionDAG and FastIsel.
 
 Portions of the DAG instruction selector are generated from the target
 description (``*.td``) files.  Our goal is for the entire instruction selector


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D78416.258477.patch
Type: text/x-patch
Size: 984 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20200418/643920a8/attachment.bin>