Added Epiphany target hook (or at least provisional one)

5 files changed, 92 insertions, 0 deletions

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 558acce..c3d6763 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1622,6 +1622,7 @@ epiphany-*-elf | epiphany-*-rtems*)
 	extra_objs="${extra_objs} mode-switch-use.o resolve-sw-modes.o"
 	tm_defines="${tm_defines} EPIPHANY_STACK_OFFSET=${with_stack_offset:-8}"
 	extra_headers="epiphany_intrinsics.h"
+	rust_target_objs="epiphany-rust.o"
 	;;
 fr30-*-elf)
 	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file}"
diff --git a/gcc/config/epiphany/epiphany-protos.h b/gcc/config/epiphany/epiphany-protos.h
index 1d05b09..4765770 100644
--- a/gcc/config/epiphany/epiphany-protos.h
+++ b/gcc/config/epiphany/epiphany-protos.h
@@ -26,6 +26,9 @@ extern struct rtx_def *gen_compare_reg (machine_mode, enum rtx_code,
 					machine_mode, rtx, rtx);
 #endif
 
+/* Defined in epiphany-rust.c  */
+extern void epiphany_rust_target_cpu_info (void);
+
 /* Declarations for various fns used in the .md file.  */
 extern void epiphany_final_prescan_insn (rtx_insn *, rtx *, int);
 extern bool epiphany_is_long_call_p (rtx);
diff --git a/gcc/config/epiphany/epiphany-rust.c b/gcc/config/epiphany/epiphany-rust.c
new file mode 100644
index 0000000..01a73d9
--- /dev/null
+++ b/gcc/config/epiphany/epiphany-rust.c
@@ -0,0 +1,82 @@
+/* Subroutines for the Rust front end for the Adapteva Epiphany architecture.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tm_p.h"
+#include "rust/rust-target.h"
+#include "rust/rust-target-def.h"
+
+/* Implement TARGET_RUST_CPU_INFO for Adapteva Epiphany targets.  */
+
+void cris_rust_target_cpu_info(void) {
+    rust_add_target_info("target_arch", "epiphany");
+
+    // llvm seems to have no support for sky (nor historical support), so names are made up by me
+    // TODO: very subject to change
+    // TODO: should the "no" dichotomy be preserved? probably not, but which should be chosen?
+    if (TARGET_HALF_REG_FILE)
+        rust_add_target_info("target_feature", "half-reg-file");
+    if (TARGET_PREFER_SHORT_INSN_REGS)
+        rust_add_target_info("target_feature", "prefer-short-insn-regs");
+    // TODO: maybe have a "branch-cost" feature? doesn't really fit well with "define-only", though
+    if (TARGET_CMOVE)
+        rust_add_target_info("target_feature", "cmove");
+    // TODO: maybe have a "nops" feature? doesn't really fit well with "define-only", though
+    if (TARGET_SOFT_CMPSF)
+        rust_add_target_info("target_feature", "soft-cmpsf");
+    else
+        rust_add_target_info("target_feature", "no-soft-cmpsf");
+    // TODO: maybe have a "stack-offset" feature? doesn't really fit well with "define-only", though
+    if (TARGET_ROUND_NEAREST)
+        rust_add_target_info("target_feature", "round-nearest");
+    else
+        rust_add_target_info("target_feature", "no-round-nearest");
+    if (TARGET_LONG_CALLS)
+        rust_add_target_info("target_feature", "long-calls");
+    if (TARGET_SHORT_CALLS)
+        rust_add_target_info("target_feature", "short-calls");
+    if (TARGET_SMALL16)
+        rust_add_target_info("target_feature", "small16");
+    // TODO: output mfp-mode somehow - "define-only" may work, but idk
+    if (TARGET_SPLIT_LOHI)
+        rust_add_target_info("target_feature", "split-lohi");
+    else
+        rust_add_target_info("target_feature", "no-split-lohi");
+    if (TARGET_POST_INC)
+        rust_add_target_info("target_feature", "postinc");
+    else
+        rust_add_target_info("target_feature", "no-postinc");
+    if (TARGET_POST_MODIFY)
+        rust_add_target_info("target_feature", "postmodify");
+    else
+        rust_add_target_info("target_feature", "no-postmodify");
+    if (TARGET_VECT_DOUBLE)
+        rust_add_target_info("target_feature", "vect-double");
+    else
+        rust_add_target_info("target_feature", "no-vect-double");
+    // TODO: maybe have a "max-vect-align" feature? doesn't really fit well with "define-only", though
+    if (TARGET_SPLIT_VECMOVE_EARLY)
+        rust_add_target_info("target_feature", "split-vecmove-early");
+    // TODO: maybe a feature about having the -1 register (1reg)?
+    if (TARGET_FP_IARITH)
+        rust_add_target_info("target_feature", "fp-iarith");
+    if (TARGET_MAY_ROUND_FOR_TRUNC)
+        rust_add_target_info("target_feature", "may-round-for-trunc");
+}
diff --git a/gcc/config/epiphany/epiphany.h b/gcc/config/epiphany/epiphany.h
index 676fc63..273588d 100644
--- a/gcc/config/epiphany/epiphany.h
+++ b/gcc/config/epiphany/epiphany.h
@@ -41,6 +41,8 @@ along with GCC; see the file COPYING3.  If not see
 	builtin_assert ("machine=epiphany");	\
     } while (0)
 
+#define TARGET_RUST_CPU_INFO epiphany_rust_target_cpu_info
+
 /* Pick up the libgloss library. One day we may do this by linker script, but
    for now its static.
    libgloss might use errno/__errno, which might not have been needed when we
diff --git a/gcc/config/epiphany/t-epiphany b/gcc/config/epiphany/t-epiphany
index 900a49e..2aa04cd 100644
--- a/gcc/config/epiphany/t-epiphany
+++ b/gcc/config/epiphany/t-epiphany
@@ -30,6 +30,10 @@ resolve-sw-modes.o : $(srcdir)/config/epiphany/resolve-sw-modes.c \
   insn-attr-common.h $(TREE_PASS_H)
 	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $<
 
+epiphany-rust.o: $(srcdir)/config/epiphany/epiphany-rust.c \
+  $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) $(C_COMMON_H)
+	$(COMPILER) -c $(ALL_COMPILERFLAGS) $(ALL_CPPFLAGS) $(INCLUDES) $<
+
 SPECS = specs.install
 
 specs: specs.install