On 10/20/2015 08:34 PM, Alexander Monakov wrote:
NVPTX does not support alloca or variable-length stack allocations, thus
heap allocation needs to be used instead. I've opted to make this a generic
change instead of guarding it with an #ifdef: libgomp usually leaves thread
stack size up to libc, so avoiding unbounded stack allocation makes sense.
* task.c (GOMP_task): Use a fixed-size on-stack buffer or a heap
allocation instead of a variable-size on-stack allocation.
+ char buf_fixed[2048], *buf = buf_fixed;
This might also not be the best of ideas on a GPU - the stack size isn't
all that unlimited, what with there being lots of threads. If I do
size_t stack, heap;
cuCtxGetLimit (&stack, CU_LIMIT_STACK_SIZE);
in the nvptx-run program we've used for testing, it shows a default
stack size of just 1kB.
Bernd
