We will add some simple implementation of libc functions starting from
this patch, and the first one is `memcmp`, which is reported in #56929. Note that
`malloc` and `free` are not included in this patch because of the use of
`declare variant`. In the near future we will implement the two functions w/o
using any vendor provided function.
This fixes#56929.
Reviewed By: jhuber6
Differential Revision: https://reviews.llvm.org/D131182
If we have a broken assumption we want to print a message to the user.
If the assumption is broken by many threads in many teams this can
become a problem. To avoid it we use a hash that tracks if a broken
assumption has (likely) been printed and avoid printing it again. This
is not fool proof and has some caveats that might cause problems in
the future (see comment) but it should improve the situation
considerably for now.
Reviewed By: JonChesterfield
Differential Revision: https://reviews.llvm.org/D112156
The RAII class used for debugging RTL entry used a shared variable to
keep track of the current depth. This used a global initializer, which
isn't supported on AMDGPU. This patch removes the initializer and
instead sets it to zero when the state is initialized in the runtime.
Reviewed By: jdoerfert, JonChesterfield
Differential Revision: https://reviews.llvm.org/D113963
Extension of D112504. Lower amdgpu printf to `__llvm_omp_vprintf`
which takes the same const char*, void* arguments as cuda vprintf and also
passes the size of the void* alloca which will be needed by a non-stub
implementation of `__llvm_omp_vprintf` for amdgpu.
This removes the amdgpu link error on any printf in a target region in favour
of silently compiling code that doesn't print anything to stdout.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D112680
Extension of D112504. Lower amdgpu printf to `__llvm_omp_vprintf`
which takes the same const char*, void* arguments as cuda vprintf and also
passes the size of the void* alloca which will be needed by a non-stub
implementation of `__llvm_omp_vprintf` for amdgpu.
This removes the amdgpu link error on any printf in a target region in favour
of silently compiling code that doesn't print anything to stdout.
The exact set of changes to check-openmp probably needs revision before commit
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D112680
Summary:
A previous patch changed the check and mistakenly only did `!expr` when
this is a macro expansion and could only apply to the left side of an
expression.
This patch changes the `assert_assume` function used for internal
assumptions in the device runtime to use a more standard formatting for
the assumption message.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D112842
This patch adds support for using function tracing features to track the
executino of runtime functions in the device runtime library. This is
enabled by first compiling the new runtime with
`-fopenmp-target-debug=3` and running with
`LIBOMPTARGET_DEVICE_RTL_DEBUG=3`. The output only tracks team 0 and
thread 0 so there isn't much output when using a generic region.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D112002
For NVPTX, `printf` can be used just with a function declaration. For AMDGCN, an
function definition is added, but it simply returns.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D109728
This patch adds support for an RAII struct that will print function
traces when placed inside of a function declaration. Each successive
call will increase the indentation to make it easier to visually
inspect.
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D110202
This patch implements the `__assert_fail` function in the new device
runtime. This allows users and developers to use the standars assert
function inside of the device.
Reviewed By: tianshilei1992
Differential Revision: https://reviews.llvm.org/D109886
The "old" OpenMP GPU device runtime (D14254) has served us well for many
years but modernizing it has caused some pain recently. This patch
introduces an alternative which is mostly written from scratch embracing
OpenMP 5.X, C++, LLVM coding style (where applicable), and conceptual
interfaces. This new runtime is opt-in through a clang flag (D106793).
The new runtime is currently only build for nvptx and has "-new" in its
name.
The design is tailored towards middle-end optimizations rather than
front-end code generation choices, a trend we already started in the old
runtime a while back. In contrast to the old one, state is organized in
a simple manner rather than a "smart" one. While this can induce costs
it helps optimizations. Our expectation is that the majority of codes
can be optimized and a "simple" design is therefore preferable. The new
runtime does also avoid users to pay for things they do not use,
especially wrt. memory. The unlikely case of nested parallelism is
supported but costly to make the more likely case use less resources.
The worksharing and reduction implementation have been taken from the
old runtime and will be rewritten in the future if necessary.
Documentation and debug features are still mostly missing and will be
added over time.
All external symbols start with `__kmpc` for legacy reasons but should
be renamed once we switch over to a single runtime. All internal symbols
are placed in appropriate namespaces (anonymous or `_OMP`) to avoid name
clashes with user symbols.
Differential Revision: https://reviews.llvm.org/D106803
Shilei Tian