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| author | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-11-21 23:32:03 +0000 |
|---|---|---|
| committer | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-11-21 23:32:03 +0000 |
| commit | e58d0f170980a5ee62629915b8bf3814b8c5b3bc (patch) | |
| tree | c9328a6f72e26ab58f5c08b5f144508cc16878e1 /gcc/tree.def | |
| parent | dc240c7432ee5d9c29fdedf980ac53c99dca9583 (diff) | |
| download | gcc-e58d0f170980a5ee62629915b8bf3814b8c5b3bc.tar.gz | |
* expr.c (expand_expr, case VIEW_CONVERT_EXPR): Refine slightly
and also support TREE_ADDRESSABLE.
* tree.def (VIEW_CONVERT_EXPR): Document TREE_ADDRESSABLE.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@47249 138bc75d-0d04-0410-961f-82ee72b054a4
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 c4f08cf5f0d..39ea31c033b 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. |