glsl/loops: replace loop controls with a normative bound.

This patch replaces the ir_loop fields "from", "to", "increment",
"counter", and "cmp" with a single integer ("normative_bound") that
serves the same purpose.

I've used the name "normative_bound" to emphasize the fact that the
back-end is required to emit code to prevent the loop from running
more than normative_bound times.  (By contrast, an "informative" bound
would be a bound that is informational only).

Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 1 insertions, 5 deletions

diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 330b4dccbb5..29fe64ad496 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1277,11 +1277,7 @@ ir_constant::is_basis() const
 ir_loop::ir_loop()
 {
    this->ir_type = ir_type_loop;
-   this->cmp = ir_unop_neg;
-   this->from = NULL;
-   this->to = NULL;
-   this->increment = NULL;
-   this->counter = NULL;
+   this->normative_bound = -1;
 }