Commit Graph

4 Commits

Author SHA1 Message Date
Artem Belevich fa07bb646c [CUDA] Provide integer SIMD functions for CUDA-9.2
CUDA-9.2 made all integer SIMD functions into compiler builtins,
so clang no longer has access to the implementation of these
functions in either headers of libdevice and has to provide
its own implementation.

This is mostly a 1:1 mapping to a corresponding PTX instructions
with an exception of vhadd2/vhadd4 that don't have an equivalent
instruction and had to be implemented with a bit hack.

Performance of this implementation will be suboptimal for SM_50
and newer GPUs where PTXAS generates noticeably worse code for
the SIMD instructions compared to the code it generates
for the inline assembly generated by nvcc (or used to come
with CUDA headers).

Differential Revision: https://reviews.llvm.org/D49274

llvm-svn: 337587
2018-07-20 17:44:34 +00:00
Artem Belevich df38f155ec [CUDA] Added missing functions.
Initial commit missed sincos(float), llabs() and few atomics that we
used to pull in from device_functions.hpp, which we no longer include.

Differential Revision: https://reviews.llvm.org/D43602

llvm-svn: 325814
2018-02-22 18:40:52 +00:00
Artem Belevich 4dbea99137 [CUDA] Added missing __threadfence_system() function for CUDA9.
llvm-svn: 325626
2018-02-20 21:25:30 +00:00
Artem Belevich fbc56a904f [CUDA] Added partial support for CUDA-9.1
Clang can use CUDA-9.1 now, though new APIs (are not implemented yet.

The major change is that headers in CUDA-9.1 went through substantial
changes that started in CUDA-9.0 which required substantial changes
in the cuda compatibility headers provided by clang.

There are two major issues:
* CUDA SDK no longer provides declarations for libdevice functions.
* A lot of device-side functions have become nvcc's builtins and
  CUDA headers no longer contain their implementations.

This patch changes the way CUDA headers are handled if we compile
with CUDA 9.x. Both 9.0 and 9.1 are affected.

* Clang provides its own declarations of libdevice functions.
* For CUDA-9.x clang now provides implementation of device-side
  'standard library' functions using libdevice.

This patch should not affect compilation with CUDA-8. There may be
some observable differences for CUDA-9.0, though they are not expected
to affect functionality.

Tested: CUDA test-suite tests for all supported combinations of:
        CUDA: 7.0,7.5,8.0,9.0,9.1
        GPU: sm_20, sm_35, sm_60, sm_70

Differential Revision: https://reviews.llvm.org/D42513

llvm-svn: 323713
2018-01-30 00:00:12 +00:00