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2010-09-08 Tom de Vries <tom@codesourcery.com>
gcc/
* gcc/emit-rtl.c (set_mem_attributes_minus_bitpos): Set MEM_READONLY_P
for static const strings.
* gcc/testsuite/gcc.dg/memcpy-3.c: New test.
2010-09-13 Andrew Stubbs <ams@codesourcery.com>
gcc/
=== modified file 'gcc/emit-rtl.c'
--- old/gcc/emit-rtl.c 2009-11-27 12:00:28 +0000
+++ new/gcc/emit-rtl.c 2010-09-15 16:40:06 +0000
@@ -1648,6 +1648,11 @@
MEM_READONLY_P (ref) = 1;
}
+ /* Mark static const strings readonly as well. */
+ if (base && TREE_CODE (base) == STRING_CST && TREE_READONLY (base)
+ && TREE_STATIC (base))
+ MEM_READONLY_P (ref) = 1;
+
/* If this expression uses it's parent's alias set, mark it such
that we won't change it. */
if (component_uses_parent_alias_set (t))
=== added file 'gcc/testsuite/gcc.dg/memcpy-3.c'
--- old/gcc/testsuite/gcc.dg/memcpy-3.c 1970-01-01 00:00:00 +0000
+++ new/gcc/testsuite/gcc.dg/memcpy-3.c 2010-09-15 16:40:06 +0000
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-rtl-expand" } */
+
+void
+f1 (char *p)
+{
+ __builtin_memcpy (p, "123", 3);
+}
+
+/* { dg-final { scan-rtl-dump-times "mem/s/u:" 3 "expand" { target mips*-*-* } } } */
+/* { dg-final { cleanup-rtl-dump "expand" } } */
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