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* [gcc/devel/omp/gcc-12] libgomp, nvptx: Add fallback for PTX versions lower than 4.1
@ 2022-06-29 14:43 Kwok Yeung
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From: Kwok Yeung @ 2022-06-29 14:43 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1486a6a4a8d4a0714aaa3eab00a79e870cfbc9a6
commit 1486a6a4a8d4a0714aaa3eab00a79e870cfbc9a6
Author: Kwok Cheung Yeung <kcy@codesourcery.com>
Date: Wed Jun 22 18:54:44 2022 +0100
libgomp, nvptx: Add fallback for PTX versions lower than 4.1
Avoid using the dynamic_smem_size register if the PTX version does not
support it.
This patch should be included when the 'libgomp, nvptx: low-latency memory
allocator' patch is upstreamed.
2022-06-21 Kwok Cheung Yeung <kcy@codesourcery.com>
libgomp/
* config/nvptx/team.c (gomp_nvptx_main): Initialize shared_pool_size
to zero. Do not use dynamic_smem_size register if PTX version lower
than 4.1.
Diff:
---
libgomp/ChangeLog.omp | 6 ++++++
libgomp/config/nvptx/team.c | 5 ++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/libgomp/ChangeLog.omp b/libgomp/ChangeLog.omp
index 242cbbfa7a1..c79c592d97b 100644
--- a/libgomp/ChangeLog.omp
+++ b/libgomp/ChangeLog.omp
@@ -1,3 +1,9 @@
+2022-06-21 Kwok Cheung Yeung <kcy@codesourcery.com>
+
+ * config/nvptx/team.c (gomp_nvptx_main): Initialize shared_pool_size
+ to zero. Do not use dynamic_smem_size register if PTX version lower
+ than 4.1.
+
2021-12-22 Andrew Stubbs <ams@codesourcery.com>
* allocator.c (MEMSPACE_ALLOC): New macro.
diff --git a/libgomp/config/nvptx/team.c b/libgomp/config/nvptx/team.c
index c7b2c70dfa6..685610e00be 100644
--- a/libgomp/config/nvptx/team.c
+++ b/libgomp/config/nvptx/team.c
@@ -69,10 +69,13 @@ gomp_nvptx_main (void (*fn) (void *), void *fn_data)
/* Find the low-latency heap details .... */
uint32_t *shared_pool;
- uint32_t shared_pool_size;
+ uint32_t shared_pool_size = 0;
asm ("cvta.shared.u64\t%0, __nvptx_lowlat_pool;" : "=r"(shared_pool));
+#if __PTX_ISA_VERSION_MAJOR__ > 4 \
+ || (__PTX_ISA_VERSION_MAJOR__ == 4 && __PTX_ISA_VERSION_MINOR__ >= 1)
asm ("mov.u32\t%0, %%dynamic_smem_size;\n"
: "=r"(shared_pool_size));
+#endif
/* ... and initialize it with an empty free-chain. */
union {
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