This libgo patch by Cherry Zhang changes the runtime package to use
the builtin memmove function directly, rather than calling through C
code. Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.
Committed to mainline.
Ian
2019-05-08 Cherry Zhang <cherr...@google.com>
* go-gcc.cc (Gcc_backend::Gcc_backend): Define memmove builtin.
Index: gcc/go/go-gcc.cc
===================================================================
--- gcc/go/go-gcc.cc (revision 270877)
+++ gcc/go/go-gcc.cc (working copy)
@@ -604,6 +604,15 @@ Gcc_backend::Gcc_backend()
NULL_TREE),
false, false);
+ // We use __builtin_memmove for copying data.
+ this->define_builtin(BUILT_IN_MEMMOVE, "__builtin_memmove", "memmove",
+ build_function_type_list(void_type_node,
+ ptr_type_node,
+ const_ptr_type_node,
+ size_type_node,
+ NULL_TREE),
+ false, false);
+
// Used by runtime/internal/sys.
this->define_builtin(BUILT_IN_CTZ, "__builtin_ctz", "ctz",
build_function_type_list(integer_type_node,
Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE (revision 271014)
+++ gcc/go/gofrontend/MERGE (working copy)
@@ -1,4 +1,4 @@
-0b4cf8ded107ccbfbd4af7f4e056f23f941d0f86
+3a9bccfbf4af1c756978c40967838d9f6a4e7a62
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
Index: libgo/Makefile.am
===================================================================
--- libgo/Makefile.am (revision 270877)
+++ libgo/Makefile.am (working copy)
@@ -461,7 +461,6 @@ runtime_files = \
runtime/go-memclr.c \
runtime/go-memcmp.c \
runtime/go-memequal.c \
- runtime/go-memmove.c \
runtime/go-nanotime.c \
runtime/go-now.c \
runtime/go-nosys.c \
Index: libgo/go/runtime/stubs.go
===================================================================
--- libgo/go/runtime/stubs.go (revision 270877)
+++ libgo/go/runtime/stubs.go (working copy)
@@ -100,6 +100,7 @@ func reflect_memclrNoHeapPointers(ptr un
// memmove copies n bytes from "from" to "to".
//go:noescape
+//extern __builtin_memmove
func memmove(to, from unsafe.Pointer, n uintptr)
//go:linkname reflect_memmove reflect.memmove
Index: libgo/runtime/go-memmove.c
===================================================================
--- libgo/runtime/go-memmove.c (revision 270877)
+++ libgo/runtime/go-memmove.c (nonexistent)
@@ -1,16 +0,0 @@
-/* go-memmove.c -- move one memory buffer to another
-
- Copyright 2016 The Go Authors. All rights reserved.
- Use of this source code is governed by a BSD-style
- license that can be found in the LICENSE file. */
-
-#include "runtime.h"
-
-void move(void *, void *, uintptr)
- __asm__ (GOSYM_PREFIX "runtime.memmove");
-
-void
-move (void *p1, void *p2, uintptr len)
-{
- __builtin_memmove (p1, p2, len);
-}
