tree.h (tree_phi_node): Add a comment about the order of PHI arguments.

	* tree.h (tree_phi_node): Add a comment about the order of PHI
	arguments.

From-SVN: r98798

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7749832e3bdd713a23e4737632fd2db13d398252..8ba855b3d436cddeeffe3a6c47a7c939574a3ea3 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -7,6 +7,9 @@
        tree_ssa_iv_optimize_finalize): Use the VEC API instead of
        VARRAY.
 
+       * tree.h (tree_phi_node): Add a comment about the order of PHI
+       arguments.
+
 2005-04-26  Paul Brook  <paul@codesourcery.com>
 
        * config/arm/arm.md (thumb_mulsi3): Use two-operand assembly form.

diff --git a/gcc/tree.h b/gcc/tree.h
index 6bc8a34c94c1c95c3d3d91b5b885a3de9536fa10..40c31199e09a6b47a148db463b997e4f51f158e3 100644 (file)
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1439,6 +1439,8 @@ struct tree_phi_node GTY(())
   /* Basic block to that the phi node belongs.  */
   struct basic_block_def *bb;
 
+  /* Arguments of the PHI node.  These are maintained in the same
+     order as predecessor edge vector BB->PREDS.  */
   struct phi_arg_d GTY ((length ("((tree)&%h)->phi.num_args"))) a[1];
 };
 \f