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[patch] tree.h: Expand a comment to phi_arg_d.
- From: Kazu Hirata <kazu at cs dot umass dot edu>
- To: gcc-patches at gcc dot gnu dot org
- Cc: amacleod at redhat dot com
- Date: Tue, 26 Apr 2005 19:34:53 -0400 (EDT)
- Subject: [patch] tree.h: Expand a comment to phi_arg_d.
Hi,
Attached is a patch to expand a comment to phi_arg_d.
AFAICT, imm_use must be the first element because
phi_arg_index_from_use does some pointer arithmetic with it. Is that
right?
OK to apply?
Kazu Hirata
2005-04-26 Kazu Hirata <kazu@cs.umass.edu>
* tree.h (phi_arg_d): Expand a comment in phi_arg_d.
Index: tree.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree.h,v
retrieving revision 1.721
diff -u -d -p -r1.721 tree.h
--- tree.h 26 Apr 2005 22:49:27 -0000 1.721
+++ tree.h 26 Apr 2005 23:34:57 -0000
@@ -1424,7 +1424,9 @@ struct edge_def;
struct phi_arg_d GTY(())
{
- struct ssa_imm_use_d imm_use; /* imm_use MUST be first element in struct. */
+ /* imm_use MUST be the first element in struct because we do some
+ pointer arithmetic with it. See phi_arg_index_from_use. */
+ struct ssa_imm_use_d imm_use;
tree def;
bool nonzero;
};