This patch adds a __PTX_ISA__ predefined macro to the nvptx backend that
allows code to check the compute model being targeted by the compiler.
This is equivalent to the __CUDA_ARCH__ macro defined by CUDA's nvcc
compiler, but to avoid causing problems for source code that checks
for that compiler, this macro uses GCC's nomenclature; it's easy
enough for users to "#define __CUDA_ARCH__ __PTX_ISA__", but I'm
also happy to modify this patch to define __CUDA_ARCH__ if that's
the preference of the nvptx backend maintainers.
What might have been a four line patch is actually a little more
complicated, as this patch takes the opportunity to upgrade the
nvptx backend to use the now preferred nvptx-c.c idiom.
This patch has been tested with a cross-compiler from
x86_64-pc-linux-gnu to nvptx-none, and tested with
"make -k check" with no new failures. This feature is
useful for implementing clock() on nvptx in newlib.
Ok for mainline?
2021-08-19 Roger Sayle <ro...@nextmovesoftware.com>
gcc/ChangeLog
* config.gcc (nvptx-*-*): Define {c,c++}_target_objs.
* config/nvptx/nvptx-protos.h (nvptx_cpu_cpp_builtins): Prototype.
* config/nvptx/nvptx.h (TARGET_CPU_CPP_BUILTINS): Implement with
a call to the new nvptx_cpu_cpp_builtins function in nvptx-c.c.
* config/nvptx/t-nvptx (nvptx-c.o): New rule.
* config/nvptx/nvptx-c.c: New source file.
(nvptx_cpu_cpp_builtins): Move implementation here.
Roger
--
Roger Sayle
NextMove Software
Cambridge, UK
diff --git a/gcc/config.gcc b/gcc/config.gcc
index 93e2b32..cbad989 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -468,6 +468,8 @@ nios2-*-*)
;;
nvptx-*-*)
cpu_type=nvptx
+ c_target_objs="nvptx-c.o"
+ cxx_target_objs="nvptx-c.o"
;;
or1k*-*-*)
cpu_type=or1k
diff --git a/gcc/config/nvptx/nvptx-protos.h b/gcc/config/nvptx/nvptx-protos.h
index b7e6ae2..b29ddc9 100644
--- a/gcc/config/nvptx/nvptx-protos.h
+++ b/gcc/config/nvptx/nvptx-protos.h
@@ -40,6 +40,7 @@ extern void nvptx_output_aligned_decl (FILE *file, const char
*name,
extern void nvptx_function_end (FILE *);
extern void nvptx_output_skip (FILE *, unsigned HOST_WIDE_INT);
extern void nvptx_output_ascii (FILE *, const char *, unsigned HOST_WIDE_INT);
+extern void nvptx_cpu_cpp_builtins (void);
extern void nvptx_register_pragmas (void);
extern unsigned int nvptx_data_alignment (const_tree, unsigned int);
diff --git a/gcc/config/nvptx/nvptx.h b/gcc/config/nvptx/nvptx.h
index fdaacdd..d367174 100644
--- a/gcc/config/nvptx/nvptx.h
+++ b/gcc/config/nvptx/nvptx.h
@@ -34,17 +34,7 @@
nvptx-as. */
#define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}"
-#define TARGET_CPU_CPP_BUILTINS() \
- do \
- { \
- builtin_assert ("machine=nvptx"); \
- builtin_assert ("cpu=nvptx"); \
- builtin_define ("__nvptx__"); \
- if (TARGET_SOFT_STACK) \
- builtin_define ("__nvptx_softstack__"); \
- if (TARGET_UNIFORM_SIMT) \
- builtin_define ("__nvptx_unisimt__"); \
- } while (0)
+#define TARGET_CPU_CPP_BUILTINS() nvptx_cpu_cpp_builtins ()
/* Avoid the default in ../../gcc.c, which adds "-pthread", which is not
supported for nvptx. */
diff --git a/gcc/config/nvptx/t-nvptx b/gcc/config/nvptx/t-nvptx
index 6c1010d..d33bacd 100644
--- a/gcc/config/nvptx/t-nvptx
+++ b/gcc/config/nvptx/t-nvptx
@@ -1,3 +1,7 @@
+nvptx-c.o: $(srcdir)/config/nvptx/nvptx-c.c
+ $(COMPILE) $<
+ $(POSTCOMPILE)
+
CFLAGS-mkoffload.o += $(DRIVER_DEFINES) \
-DGCC_INSTALL_NAME=\"$(GCC_INSTALL_NAME)\"
mkoffload.o: $(srcdir)/config/nvptx/mkoffload.c
diff --git a/gcc/config/nvptx/nvptx-c.c b/gcc/config/nvptx/nvptx-c.c
new file mode 100644
index 0000000..5a7a0ef
--- /dev/null
+++ b/gcc/config/nvptx/nvptx-c.c
@@ -0,0 +1,47 @@
+/* Subroutines for the C front end on the NVPTX architecture.
+ * Copyright (C) 2021 Free Software Foundation, Inc.
+ *
+ * This file is part of GCC.
+ *
+ * GCC is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 3, or (at your
+ * option) any later version.
+ *
+ * GCC is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GCC; see the file COPYING3. If not see
+ * <http://www.gnu.org/licenses/>. */
+
+#define IN_TARGET_CODE 1
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "target.h"
+#include "c-family/c-common.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "c-family/c-pragma.h"
+
+/* Function to tell the preprocessor about the defines for the target. */
+void
+nvptx_cpu_cpp_builtins (void)
+{
+ cpp_assert (parse_in, "machine=nvptx");
+ cpp_assert (parse_in, "cpu=nvptx");
+ cpp_define (parse_in, "__nvptx__");
+ if (TARGET_SOFT_STACK)
+ cpp_define (parse_in, "__nvptx_softstack__");
+ if (TARGET_UNIFORM_SIMT)
+ cpp_define (parse_in,"__nvptx_unisimt__");
+ if (TARGET_SM35)
+ cpp_define (parse_in, "__PTX_ISA__=350");
+ else
+ cpp_define (parse_in,"__PTX_ISA__=300");
+}
+
