https://gcc.gnu.org/g:33f539fa1466fa2ac21091c35b81d00741adc85f
commit 33f539fa1466fa2ac21091c35b81d00741adc85f
Author: Andrew Stubbs <a...@codesourcery.com>
Date: Mon Apr 22 18:07:00 2024 +0200
openmp: Add -foffload-memory
Add a new option. It's inactive until I add some follow-up patches.
gcc/ChangeLog:
* common.opt: Add -foffload-memory and its enum values.
* coretypes.h (enum offload_memory): New.
Diff:
---
gcc/ChangeLog.omp | 6 ++++++
gcc/common.opt | 16 ++++++++++++++++
gcc/coretypes.h | 7 +++++++
gcc/doc/invoke.texi | 16 +++++++++++++++-
4 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog.omp b/gcc/ChangeLog.omp
index 52306a5d516..f2bf2eb5b50 100644
--- a/gcc/ChangeLog.omp
+++ b/gcc/ChangeLog.omp
@@ -1,3 +1,9 @@
+2023-08-23 Andrew Stubbs <a...@codesourcery.com>
+
+ * common.opt: Add -foffload-memory and its enum values.
+ * coretypes.h (enum offload_memory): New.
+ * doc/invoke.texi: Document -foffload-memory.
+
2022-10-19 Tobias Burnus <tob...@codesourcery.com>
* omp-expand.cc (expand_omp_target): Fix OpenACC in case there
diff --git a/gcc/common.opt b/gcc/common.opt
index ad348844775..e19c4ef1166 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2339,6 +2339,22 @@ Enum(offload_abi) String(ilp32) Value(OFFLOAD_ABI_ILP32)
EnumValue
Enum(offload_abi) String(lp64) Value(OFFLOAD_ABI_LP64)
+foffload-memory=
+Common Joined RejectNegative Enum(offload_memory) Var(flag_offload_memory)
Init(OFFLOAD_MEMORY_NONE)
+-foffload-memory=[none|unified|pinned] Use an offload memory optimization.
+
+Enum
+Name(offload_memory) Type(enum offload_memory) UnknownError(Unknown offload
memory option %qs)
+
+EnumValue
+Enum(offload_memory) String(none) Value(OFFLOAD_MEMORY_NONE)
+
+EnumValue
+Enum(offload_memory) String(unified) Value(OFFLOAD_MEMORY_UNIFIED)
+
+EnumValue
+Enum(offload_memory) String(pinned) Value(OFFLOAD_MEMORY_PINNED)
+
fomit-frame-pointer
Common Var(flag_omit_frame_pointer) Optimization
When possible do not generate stack frames.
diff --git a/gcc/coretypes.h b/gcc/coretypes.h
index 1ac6f0abea3..938cfa93753 100644
--- a/gcc/coretypes.h
+++ b/gcc/coretypes.h
@@ -218,6 +218,13 @@ enum offload_abi {
OFFLOAD_ABI_ILP32
};
+/* Types of memory optimization for an offload device. */
+enum offload_memory {
+ OFFLOAD_MEMORY_NONE,
+ OFFLOAD_MEMORY_UNIFIED,
+ OFFLOAD_MEMORY_PINNED
+};
+
/* Types of profile update methods. */
enum profile_update {
PROFILE_UPDATE_SINGLE,
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 3e2f9bd5b4b..a368d80a123 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -202,7 +202,7 @@ in the following sections.
-fno-builtin -fno-builtin-@var{function} -fcond-mismatch
-ffreestanding -fgimple -fgnu-tm -fgnu89-inline -fhosted
-flax-vector-conversions -fms-extensions
--foffload=@var{arg} -foffload-options=@var{arg}
+-foffload=@var{arg} -foffload-options=@var{arg} -foffload-memory=@var{arg}
-fopenacc -fopenacc-dim=@var{geom}
-fopenmp -fopenmp-simd -fopenmp-target-simd-clone@r{[}=@var{device-type}@r{]}
-fpermitted-flt-eval-methods=@var{standard}
@@ -2779,6 +2779,20 @@ Typical command lines are
-foffload-options=amdgcn-amdhsa=-march=gfx906
@end smallexample
+@opindex foffload-memory
+@cindex OpenMP offloading memory modes
+@item -foffload-memory=none
+@itemx -foffload-memory=unified
+@itemx -foffload-memory=pinned
+Enable a memory optimization mode to use with OpenMP. The default behavior,
+@option{-foffload-memory=none}, is to do nothing special (unless enabled via
+a requires directive in the code). @option{-foffload-memory=unified} is
+equivalent to @code{#pragma omp requires unified_shared_memory}.
+@option{-foffload-memory=pinned} forces all host memory to be pinned (this
+mode may require the user to increase the ulimit setting for locked memory).
+All translation units must select the same setting to avoid undefined
+behavior.
+
@opindex fopenacc
@cindex OpenACC accelerator programming
@item -fopenacc
