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Mirror of https://github.com/RPCS3/llvm-mirror
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226d4b8ac5
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Hsiangkai Wang 226d4b8ac5 [RISCV] Frame handling for RISC-V V extension. 
This patch proposes how to deal with RISC-V vector frame objects. The
layout of RISC-V vector frame will look like

|---------------------------------|
| scalar callee-saved registers   |
|---------------------------------|
| scalar local variables          |
|---------------------------------|
| scalar outgoing arguments       |
|---------------------------------|
| RVV local variables &&          |
| RVV outgoing arguments          |
|---------------------------------| <- end of frame (sp)

If there is realignment or variable length array in the stack, we will use
frame pointer to access fixed objects and stack pointer to access
non-fixed objects.

|---------------------------------| <- frame pointer (fp)
| scalar callee-saved registers   |
|---------------------------------|
| scalar local variables          |
|---------------------------------|
| ///// realignment /////         |
|---------------------------------|
| scalar outgoing arguments       |
|---------------------------------|
| RVV local variables &&          |
| RVV outgoing arguments          |
|---------------------------------| <- end of frame (sp)

If there are both realignment and variable length array in the stack, we
will use frame pointer to access fixed objects and base pointer to access
non-fixed objects.

|---------------------------------| <- frame pointer (fp)
| scalar callee-saved registers   |
|---------------------------------|
| scalar local variables          |
|---------------------------------|
| ///// realignment /////         |
|---------------------------------| <- base pointer (bp)
| RVV local variables &&          |
| RVV outgoing arguments          |
|---------------------------------|
| /////////////////////////////// |
| variable length array           |
| /////////////////////////////// |
|---------------------------------| <- end of frame (sp)
| scalar outgoing arguments       |
|---------------------------------|

In this version, we do not save the addresses of RVV objects in the
stack. We access them directly through the polynomial expression
(a x VLENB + b). We do not reserve frame pointer when there is any RVV
object in the stack. So, we also access the scalar frame objects through the
polynomial expression (a x VLENB + b) if the access across RVV stack
area.

Differential Revision: https://reviews.llvm.org/D94465
2021-02-17 14:05:19 +08:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake Support multi-configuration generators correctly in several config files 2021-02-11 09:32:20 -08:00
docs [llvm-libtool] Emit warnings for files without symbols 2021-02-16 17:52:12 -08:00
examples [Draft] [examples] Move llvm/examples/OCaml-Kaleidoscope/ to llvm-archive 2021-02-11 06:52:24 +05:30
include [SampleFDO] Reapply: Refactor SampleProfile.cpp 2021-02-16 16:43:21 -08:00
lib [RISCV] Frame handling for RISC-V V extension. 2021-02-17 14:05:19 +08:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [CMake] Delete LLVM_RUNTIME_BUILD_ID_LINK_TARGETS 2021-02-15 11:06:23 -08:00
test [RISCV] Frame handling for RISC-V V extension. 2021-02-17 14:05:19 +08:00
tools [llvm-libtool] Emit warnings for files without symbols 2021-02-16 17:52:12 -08:00
unittests [NewPM] Introduce (GPU)DivergenceAnalysis in the new pass manager 2021-02-16 10:26:45 +05:30
utils [gn build] Port 6fd5ccff72ee 2021-02-17 00:53:56 +00:00
.clang-format
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore [clangd] Store index in '.cache/clangd/index' instead of '.clangd/index' 2020-07-07 14:53:45 +02:00
CMakeLists.txt [Timer] On macOS count number of executed instructions 2021-02-11 17:26:37 +01:00
CODE_OWNERS.TXT Change XCore code owner. 2021-01-14 12:13:48 +00:00
configure
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
README.txt Test commit. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

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.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.