glsl: Remove some stale comments about ir_call

ir_call was changed long ago to be a statement rather than an
expression.  That makes this comment no longer valid.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>

diff --git a/src/glsl/lower_clip_distance.cpp b/src/glsl/lower_clip_distance.cpp
index 2ba0052e05d00e2b729c5171b3105989562a0b01..129375d6659022a15839e9891cdb1b6da321eba0 100644 (file)
--- a/src/glsl/lower_clip_distance.cpp
+++ b/src/glsl/lower_clip_distance.cpp
@@ -226,12 +226,8 @@ lower_clip_distance_visitor::visit_leave(ir_assignment *ir)
        * each of them.
        *
        * Note: to unroll into element-by-element assignments, we need to make
-       * clones of the LHS and RHS.  This is only safe if the LHS and RHS are
-       * side-effect free.  Fortunately, we know that they are, because the
-       * only kind of rvalue that can have side effects is an ir_call, and
-       * ir_calls only appear (a) as a statement on their own, or (b) as the
-       * RHS of an assignment that stores the result of the call in a
-       * temporary variable.
+       * clones of the LHS and RHS.  This is safe because expressions and
+       * l-values are side-effect free.
        */
       void *ctx = ralloc_parent(ir);
       int array_size = this->old_clip_distance_var->type->array_size();