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| author | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 2001-11-21 23:32:03 +0000 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 2001-11-21 18:32:03 -0500 |
| commit | c11c10d87b229fc9bfa4a1e0a5a342e3344f737d (patch) | |
| tree | c9328a6f72e26ab58f5c08b5f144508cc16878e1 /gcc/tree.def | |
| parent | 2e7d5318fc0902a682ef1a2b1e43df40f7f3de29 (diff) | |
| download | gcc-c11c10d87b229fc9bfa4a1e0a5a342e3344f737d.zip gcc-c11c10d87b229fc9bfa4a1e0a5a342e3344f737d.tar.gz gcc-c11c10d87b229fc9bfa4a1e0a5a342e3344f737d.tar.bz2 | |
expr.c (expand_expr, [...]): Refine slightly and also support TREE_ADDRESSABLE.
* expr.c (expand_expr, case VIEW_CONVERT_EXPR): Refine slightly
and also support TREE_ADDRESSABLE.
* tree.def (VIEW_CONVERT_EXPR): Document TREE_ADDRESSABLE.
From-SVN: r47249
Diffstat (limited to 'gcc/tree.def')
| -rw-r--r-- | gcc/tree.def | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/tree.def b/gcc/tree.def index c4f08cf..39ea31c 100644 --- a/gcc/tree.def +++ b/gcc/tree.def @@ -695,7 +695,12 @@ DEFTREECODE (NON_LVALUE_EXPR, "non_lvalue_expr", '1', 1) This corresponds to an "Unchecked Conversion" in Ada and roughly to the idiom *(type2 *)&X in C. The only operand is the value to be viewed as being of another type. It is undefined if the type of the - input and of the expression have different sizes. */ + input and of the expression have different sizes. + + This code may also be used within the LHS of a MODIFY_EXPR, in which + case no actual data motion may occur. TREE_ADDRESSABLE will be set in + this case and GCC must abort if it could not do the operation without + generating insns. */ DEFTREECODE (VIEW_CONVERT_EXPR, "view_convert_expr", '1', 1) /* Represents something we computed once and will use multiple times. |