75 lines
2.6 KiB
Diff
75 lines
2.6 KiB
Diff
2006-09-28 Jakub Jelinek <jakub@redhat.com>
|
|
|
|
PR middle-end/29272
|
|
* builtins.c (fold_builtin_memset, fold_builtin_memory_op): Restrict
|
|
single entry optimization to variables and components thereof.
|
|
|
|
--- gcc/builtins.c.jj 2006-09-22 10:29:55.000000000 +0200
|
|
+++ gcc/builtins.c 2006-09-28 20:31:30.000000000 +0200
|
|
@@ -7905,7 +7905,7 @@ fold_builtin_exponent (tree fndecl, tree
|
|
static tree
|
|
fold_builtin_memset (tree arglist, tree type, bool ignore)
|
|
{
|
|
- tree dest, c, len, var, ret;
|
|
+ tree dest, c, len, var, ret, inner;
|
|
unsigned HOST_WIDE_INT length, cval;
|
|
|
|
if (!validate_arglist (arglist,
|
|
@@ -7939,6 +7939,15 @@ fold_builtin_memset (tree arglist, tree
|
|
&& !POINTER_TYPE_P (TREE_TYPE (var)))
|
|
return 0;
|
|
|
|
+ /* If var is a VAR_DECL or a component thereof,
|
|
+ we can use its alias set, otherwise we'd need to make
|
|
+ sure we go through alias set 0. */
|
|
+ inner = var;
|
|
+ while (handled_component_p (inner))
|
|
+ inner = TREE_OPERAND (inner, 0);
|
|
+ if (! SSA_VAR_P (inner))
|
|
+ return 0;
|
|
+
|
|
length = tree_low_cst (len, 1);
|
|
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (var))) != length
|
|
|| get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT
|
|
@@ -8009,7 +8018,7 @@ fold_builtin_bzero (tree arglist, bool i
|
|
static tree
|
|
fold_builtin_memory_op (tree arglist, tree type, bool ignore, int endp)
|
|
{
|
|
- tree dest, src, len, destvar, srcvar, expr;
|
|
+ tree dest, src, len, destvar, srcvar, expr, inner;
|
|
unsigned HOST_WIDE_INT length;
|
|
|
|
if (! validate_arglist (arglist,
|
|
@@ -8050,6 +8059,15 @@ fold_builtin_memory_op (tree arglist, tr
|
|
&& !SCALAR_FLOAT_TYPE_P (TREE_TYPE (destvar)))
|
|
return 0;
|
|
|
|
+ /* If destvar is a VAR_DECL or a component thereof,
|
|
+ we can use its alias set, otherwise we'd need to make
|
|
+ sure we go through alias set 0. */
|
|
+ inner = destvar;
|
|
+ while (handled_component_p (inner))
|
|
+ inner = TREE_OPERAND (inner, 0);
|
|
+ if (! SSA_VAR_P (inner))
|
|
+ return 0;
|
|
+
|
|
srcvar = src;
|
|
STRIP_NOPS (srcvar);
|
|
if (TREE_CODE (srcvar) != ADDR_EXPR)
|
|
@@ -8064,6 +8082,15 @@ fold_builtin_memory_op (tree arglist, tr
|
|
&& !SCALAR_FLOAT_TYPE_P (TREE_TYPE (srcvar)))
|
|
return 0;
|
|
|
|
+ /* If srcvar is a VAR_DECL or a component thereof,
|
|
+ we can use its alias set, otherwise we'd need to make
|
|
+ sure we go through alias set 0. */
|
|
+ inner = srcvar;
|
|
+ while (handled_component_p (inner))
|
|
+ inner = TREE_OPERAND (inner, 0);
|
|
+ if (! SSA_VAR_P (inner))
|
|
+ return 0;
|
|
+
|
|
length = tree_low_cst (len, 1);
|
|
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (destvar))) != length
|
|
|| get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT
|