Nicolai Haehnle f0eb7094d4 AMDGPU/SI: add llvm.amdgcn.buffer.load/store.format intrinsics ...

Summary:
They correspond to BUFFER_LOAD/STORE_FORMAT_XYZW and will be used by Mesa
to implement the GL_ARB_shader_image_load_store extension.

The intention is that for llvm.amdgcn.buffer.load.format, LLVM will decide
whether one of the _X/_XY/_XYZ opcodes can be used (similar to image sampling
and loads). However, this is not currently implemented.

For llvm.amdgcn.buffer.store, LLVM cannot decide to use one of the "smaller"
opcodes and therefore the intrinsic is overloaded. Currently, only the v4f32
is actually implemented since GLSL also only has a vec4 variant of the store
instructions, although it's conceivable that Mesa will want to be smarter
about this in the future.

BUFFER_LOAD_FORMAT_XYZW is already exposed via llvm.SI.vs.load.input, which
has a legacy name, pretends not to access memory, and does not capture the
full flexibility of the instruction.

Reviewers: arsenm, tstellarAMD, mareko

Subscribers: arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D17277

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263140 91177308-0d34-0410-b5e6-96231b3b80d8

2016-03-10 18:43:50 +00:00

..

llvm

AMDGPU/SI: add llvm.amdgcn.buffer.load/store.format intrinsics

2016-03-10 18:43:50 +00:00

llvm-c

Use lto_bool_t instead of a raw bool (fixup for r262977).

2016-03-09 04:05:28 +00:00