Since OpenMP offloading requires both soft-stacks and "uniform SIMT", both
non-traditional codegen variants, I'm building a multilib variant with those
enabled. This patch adds option -mgomp which enables -msoft-stack plus
-muniform-simt, and builds a multilib with it.
* config/nvptx/nvptx.c (nvptx_option_override): Handle TARGET_GOMP.
* config/nvptx/nvptx.opt (mgomp): New option.
* config/nvptx/t-nvptx (MULTILIB_OPTIONS): New.
* doc/invoke.texi (mgomp): Document.
---
gcc/config/nvptx/nvptx.c | 3 +++
gcc/config/nvptx/nvptx.opt | 4 ++++
gcc/config/nvptx/t-nvptx | 2 ++
gcc/doc/invoke.texi | 5 +++++
4 files changed, 14 insertions(+)
diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c
index 3bd3cf7..48ee96e 100644
--- a/gcc/config/nvptx/nvptx.c
+++ b/gcc/config/nvptx/nvptx.c
@@ -153,6 +153,9 @@ nvptx_option_override (void)
worker_red_sym = gen_rtx_SYMBOL_REF (Pmode, worker_red_name);
worker_red_align = GET_MODE_ALIGNMENT (SImode) / BITS_PER_UNIT;
+
+ if (TARGET_GOMP)
+ target_flags |= MASK_SOFT_STACK | MASK_UNIFORM_SIMT;
}
/* Return the mode to be used when declaring a ptx object for OBJ.
diff --git a/gcc/config/nvptx/nvptx.opt b/gcc/config/nvptx/nvptx.opt
index 47e811e..8826659 100644
--- a/gcc/config/nvptx/nvptx.opt
+++ b/gcc/config/nvptx/nvptx.opt
@@ -36,3 +36,7 @@ Use custom stacks instead of local memory for automatic
storage.
muniform-simt
Target Report Mask(UNIFORM_SIMT)
Generate code that executes all threads in a warp as if one was active.
+
+mgomp
+Target Report Mask(GOMP)
+Generate code for OpenMP offloading: enables -msoft-stack and -muniform-simt.
diff --git a/gcc/config/nvptx/t-nvptx b/gcc/config/nvptx/t-nvptx
index e2580c9..6c1010d 100644
--- a/gcc/config/nvptx/t-nvptx
+++ b/gcc/config/nvptx/t-nvptx
@@ -8,3 +8,5 @@ ALL_HOST_OBJS += mkoffload.o
mkoffload$(exeext): mkoffload.o collect-utils.o libcommon-target.a
$(LIBIBERTY) $(LIBDEPS)
+$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
mkoffload.o collect-utils.o libcommon-target.a $(LIBIBERTY) $(LIBS)
+
+MULTILIB_OPTIONS = mgomp
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 46cd2e9..7e7f3b4 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -18956,6 +18956,11 @@ all-ones bitmasks for each warp, indicating current
mode (0 outside of SIMD
regions). Each thread can bitwise-and the bitmask at position @code{tid.y}
with current lane index to compute the master lane index.
+@item -mgomp
+@opindex mgomp
+Generate code for use in OpenMP offloading: enables @option{-msoft-stack} and
+@option{-muniform-simt} options, and selects corresponding multilib variant.
+
@end table
@node PDP-11 Options
