mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-04 22:07:27 +00:00
19cb35b4bc
This was done using the Sparc and PowerPC AsmParsers as guides. So far it is very simple and only supports sopp instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221994 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.0 KiB
ReStructuredText
44 lines
1.0 KiB
ReStructuredText
============================
|
|
User Guide for R600 Back-end
|
|
============================
|
|
|
|
Introduction
|
|
============
|
|
|
|
The R600 back-end provides ISA code generation for AMD GPUs, starting with
|
|
the R600 family up until the current Sea Islands (GCN Gen 2).
|
|
|
|
|
|
Assembler
|
|
=========
|
|
|
|
The assembler is currently a work in progress and not yet complete. Below
|
|
are the currently supported features.
|
|
|
|
SOPP Instructions
|
|
-----------------
|
|
|
|
Unless otherwise mentioned, all SOPP instructions that with an operand
|
|
accept a integer operand(s) only. No verification is performed on the
|
|
operands, so it is up to the programmer to be familiar with the range
|
|
or acceptable values.
|
|
|
|
s_waitcnt
|
|
^^^^^^^^^
|
|
|
|
s_waitcnt accepts named arguments to specify which memory counter(s) to
|
|
wait for.
|
|
|
|
.. code-block:: nasm
|
|
|
|
// Wait for all counters to be 0
|
|
s_waitcnt 0
|
|
|
|
// Equivalent to s_waitcnt 0. Counter names can also be delimited by
|
|
// '&' or ','.
|
|
s_waitcnt vmcnt(0) expcnt(0) lgkcmt(0)
|
|
|
|
// Wait for vmcnt counter to be 1.
|
|
s_waitcnt vmcnt(1)
|
|
|