@@ -1,5 +1,5 @@
/* Subroutines used for code generation for RISC-V.
- Copyright (C) 2011-2017 Free Software Foundation, Inc.
+ Copyright (C) 2011-2018 Free Software Foundation, Inc.
Contributed by Andrew Waterman (andrew@sifive.com).
Based on MIPS target for GNU compiler.
@@ -177,9 +177,6 @@ struct GTY(()) machine_function {
This area is allocated by the callee at the very top of the frame. */
int varargs_size;
- /* Memoized return value of leaf_function_p. <0 if false, >0 if true. */
- int is_leaf;
-
/* The current frame information, calculated by riscv_compute_frame_info. */
struct riscv_frame_info frame;
};
@@ -3994,26 +3991,15 @@ riscv_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
emit_insn (gen_clear_cache (addr, end_addr));
}
-/* Return leaf_function_p () and memoize the result. */
-
-static bool
-riscv_leaf_function_p (void)
-{
- if (cfun->machine->is_leaf == 0)
- cfun->machine->is_leaf = leaf_function_p () ? 1 : -1;
-
- return cfun->machine->is_leaf > 0;
-}
-
/* Implement TARGET_FUNCTION_OK_FOR_SIBCALL. */
static bool
riscv_function_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED,
tree exp ATTRIBUTE_UNUSED)
{
- /* When optimzing for size, don't use sibcalls in non-leaf routines */
+ /* Don't use sibcalls when use save-restore routine. */
if (TARGET_SAVE_RESTORE)
- return riscv_leaf_function_p ();
+ return false;
return true;
}
new file mode 100644
@@ -0,0 +1,41 @@
+# Copyright (C) 2017-2018 Free Software Foundation, Inc.
+
+# This program 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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/>.
+
+# GCC testsuite that uses the `dg.exp' driver.
+
+# Exit immediately if this isn't a RISC-V target.
+if ![istarget riscv*-*-*] then {
+ return
+}
+
+# Load support procs.
+load_lib gcc-dg.exp
+
+# If a testcase doesn't have special options, use these.
+global DEFAULT_CFLAGS
+if ![info exists DEFAULT_CFLAGS] then {
+ set DEFAULT_CFLAGS " -ansi -pedantic-errors"
+}
+
+# Initialize `dg'.
+dg-init
+
+# Main loop.
+dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/*.\[cS\]]] \
+ "" $DEFAULT_CFLAGS
+
+# All done.
+dg-finish
new file mode 100644
@@ -0,0 +1,25 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -msave-restore -fomit-frame-pointer" } */
+
+#include <stdlib.h>
+
+__attribute__((noinline)) int g(void) { return 42; }
+
+__attribute__((noinline)) int f(void) {
+ asm volatile ("li s0, 0x87654321" ::: "s0");
+ return g();
+}
+
+int main(void) {
+ asm volatile ("li s0, 0x12345678" ::: "s0");
+
+ f();
+
+ long s0;
+ asm volatile ("mv %0, s0" : "=r"(s0));
+
+ if (s0 == 0x12345678)
+ exit (0);
+ else
+ abort();
+}
The gcc-7-branch version of the patch. 2018-01-08 Monk Chiang <sh.chiang04@gmail.com> Kito Cheng <kito.cheng@gmail.com> gcc/ * config/riscv/riscv.c (machine_function::is_leaf): Remove field. (riscv_leaf_function_p): Delete. (riscv_function_ok_for_sibcall): Return false when TARGET_SAVE_RESTORE. 2018-01-08 Chih-Mao Chen <pkmx.tw@gmail.com> Monk Chiang <sh.chiang04@gmail.com> gcc/testsuite/ * gcc.target/riscv/save-restore-1.c: New. 2017-11-29 Jim Wilson <jimw@sifive.com> gcc/testsuite/ * gcc.target/riscv/riscv.exp: New. --- gcc/config/riscv/riscv.c | 20 ++---------- gcc/testsuite/gcc.target/riscv/riscv.exp | 41 +++++++++++++++++++++++++ gcc/testsuite/gcc.target/riscv/save-restore-1.c | 25 +++++++++++++++ 3 files changed, 69 insertions(+), 17 deletions(-) create mode 100644 gcc/testsuite/gcc.target/riscv/riscv.exp create mode 100644 gcc/testsuite/gcc.target/riscv/save-restore-1.c