We can use the intersection function to reduce the range
even further if the operand has bounds between 0.0 and 1.0.
---
src/glsl/opt_minmax.cpp | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/glsl/opt_minmax.cpp b/src/glsl/opt_minmax.cpp
index 341006e..b925aaa 100644
--- a/src/glsl/opt_minmax.cpp
+++ b/src/glsl/opt_minmax.cpp
@@ -292,6 +292,13 @@ get_range(ir_rvalue *rval)
low = new(mem_ctx) ir_constant(-1.0f);
return minmax_range(low, high);
+ case ir_unop_saturate:
+ high = new(mem_ctx) ir_constant(1.0f);
+ low = new(mem_ctx) ir_constant(0.0f);
+ r0 = get_range(expr->operands[0]);
+ // We can get the intersection here to limit the range even more
+ return range_intersection(r0, minmax_range(low, high));
+
default:
break;
}
--
2.0.3
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
