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Nicolai Haehnle 08e8cb5760 AMDGPU/MC: Add .amdgpu_lds directive 
Summary:
The directive defines a symbol as an group/local memory (LDS) symbol.
LDS symbols behave similar to common symbols for the purposes of ELF,
using the processor-specific SHN_AMDGPU_LDS as section index.

It is the linker and/or runtime loader's job to "instantiate" LDS symbols
and resolve relocations that reference them.

It is not possible to initialize LDS memory (not even zero-initialize
as for .bss).

We want to be able to link together objects -- starting with relocatable
objects, but possible expanding to shared objects in the future -- that
access LDS memory in a flexible way.

LDS memory is in an address space that is entirely separate from the
address space that contains the program image (code and normal data),
so having program segments for it doesn't really make sense.

Furthermore, we want to be able to compile multiple kernels in a
compilation unit which have disjoint use of LDS memory. In that case,
we may want to place LDS symbols differently for different kernels
to save memory (LDS memory is very limited and physically private to
each kernel invocation), so we can't simply place LDS symbols in a
.lds section.

Hence this solution where LDS symbols always stay undefined.

Change-Id: I08cbc37a7c0c32f53f7b6123aa0afc91dbc1748f

Reviewers: arsenm, rampitec, t-tye, b-sumner, jsjodin

Subscribers: kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D61493

llvm-svn: 364296
 		2019-06-25 11:51:35 +00:00
clang [clangd] Narrow rename to local symbols. 2019-06-25 08:43:17 +00:00
clang-tools-extra [clangd] Fix NestedNameSpecifierLoc in SelectionTree 2019-06-25 09:36:09 +00:00
compiler-rt [sanitizer] Enabled getpw_getgr.cc on iOS 2019-06-25 01:01:46 +00:00
debuginfo-tests Store a pointer to the return value in a static alloca and let the debugger use that 2019-06-20 17:15:21 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx Fix test failures due to modified wording in Clang diagnostics. 2019-06-24 22:01:03 +00:00
libcxxabi [demangle] Special case clang's creative mangling of __uuidof expressions. 2019-06-18 23:34:09 +00:00
libunwind [libunwind][AArch64] Fix libunwind::Registers_arm64::jumpto 2019-06-17 11:00:21 +00:00
lld Port r363962 to COFF: Deduplicate undefined symbol diagnostics 2019-06-25 09:55:55 +00:00
lldb Remove core loading timeout 2019-06-25 07:14:29 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm AMDGPU/MC: Add .amdgpu_lds directive 2019-06-25 11:51:35 +00:00
openmp [OpenMP][libomptarget] Add support for declare target to clause under unified memory 2019-06-19 15:48:10 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [test] Add wrap flags after D61934. 2019-06-17 19:17:07 +00:00
pstl [pstl] Default to the serial backend when unspecified 2019-06-20 17:56:51 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.