speculation_barrier for MIPS needs sync+jr.hb (r2+),
so we implement __speculation_barrier in libgcc, like arm32 does.
gcc/ChangeLog:
* config/mips/mips-protos.h (mips_emit_speculation_barrier): New
prototype.
* config/mips/mips.cc (speculation_barrier_libfunc): New static
variable.
(mips_init_libfuncs): Initialize it.
(mips_emit_speculation_barrier): New function.
* config/arm/arm.md (speculation_barrier): Call
mips_emit_speculation_barrier.
libgcc/ChangeLog:
* config/mips/lib1funcs.S: New file.
define __speculation_barrier and include mips16.S.
* config/mips/t-mips: define LIB1ASMSRC as mips/lib1funcs.S.
define LIB1ASMFUNCS as _speculation_barrier.
set version info for __speculation_barrier.
* config/mips/libgcc-mips.ver: New file.
* config/mips/t-mips16: don't define LIB1ASMSRC as mips16.S is
included in lib1funcs.S now.
---
gcc/config/mips/mips-protos.h | 2 +
gcc/config/mips/mips.cc| 13 +++
gcc/config/mips/mips.md| 12 ++
libgcc/config/mips/lib1funcs.S | 60 ++
libgcc/config/mips/libgcc-mips.ver | 21 +++
libgcc/config/mips/t-mips | 7
libgcc/config/mips/t-mips16| 3 +-
7 files changed, 116 insertions(+), 2 deletions(-)
create mode 100644 libgcc/config/mips/lib1funcs.S
create mode 100644 libgcc/config/mips/libgcc-mips.ver
diff --git a/gcc/config/mips/mips-protos.h b/gcc/config/mips/mips-protos.h
index 20483469105..da7902c235b 100644
--- a/gcc/config/mips/mips-protos.h
+++ b/gcc/config/mips/mips-protos.h
@@ -388,4 +388,6 @@ extern void mips_register_frame_header_opt (void);
extern void mips_expand_vec_cond_expr (machine_mode, machine_mode, rtx *);
extern void mips_expand_vec_cmp_expr (rtx *);
+extern void mips_emit_speculation_barrier_function (void);
+
#endif /* ! GCC_MIPS_PROTOS_H */
diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index ca822758b41..139707fda34 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -13611,6 +13611,9 @@ mips_autovectorize_vector_modes (vector_modes *modes,
bool)
return 0;
}
+
+static GTY(()) rtx speculation_barrier_libfunc;
+
/* Implement TARGET_INIT_LIBFUNCS. */
static void
@@ -13680,6 +13683,7 @@ mips_init_libfuncs (void)
synchronize_libfunc = init_one_libfunc ("__sync_synchronize");
init_sync_libfuncs (UNITS_PER_WORD);
}
+ speculation_barrier_libfunc = init_one_libfunc ("__speculation_barrier");
}
/* Build up a multi-insn sequence that loads label TARGET into $AT. */
@@ -19092,6 +19096,15 @@ mips_avoid_hazard (rtx_insn *after, rtx_insn *insn,
int *hilo_delay,
}
}
+/* Emit a speculation barrier.
+ JR.HB is needed, so we need to put
+ speculation_barrier_libfunc in libgcc */
+void
+mips_emit_speculation_barrier_function ()
+{
+ emit_library_call (speculation_barrier_libfunc, LCT_NORMAL, VOIDmode);
+}
+
/* A SEQUENCE is breakable iff the branch inside it has a compact form
and the target has compact branches. */
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index ac1d77afc7d..5d04ac566dd 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -160,6 +160,8 @@
;; The `.insn' pseudo-op.
UNSPEC_INSN_PSEUDO
UNSPEC_JRHB
+
+ VUNSPEC_SPECULATION_BARRIER
])
(define_constants
@@ -7455,6 +7457,16 @@
mips_expand_conditional_move (operands);
DONE;
})
+
+(define_expand "speculation_barrier"
+ [(unspec_volatile [(const_int 0)] VUNSPEC_SPECULATION_BARRIER)]
+ ""
+ "
+ mips_emit_speculation_barrier_function ();
+ DONE;
+ "
+)
+
;;
;;
diff --git a/libgcc/config/mips/lib1funcs.S b/libgcc/config/mips/lib1funcs.S
new file mode 100644
index 000..45d74e2e762
--- /dev/null
+++ b/libgcc/config/mips/lib1funcs.S
@@ -0,0 +1,60 @@
+/* Copyright (C) 1995-2023 Free Software Foundation, Inc.
+
+This file 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.
+
+This file 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+. */
+
+#include "mips16.S"
+
+#ifdef L_speculation_barrier
+
+/* MIPS16e1 has no sync/jr.hb instructions, and
