[Mesa-dev] [PATCH 13/16] glsl: Add ir_binop_sub to get_range

[Thomas Helland]

---
 src/glsl/opt_minmax.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/glsl/opt_minmax.cpp b/src/glsl/opt_minmax.cpp
index 0638a12..9d300d3 100644
--- a/src/glsl/opt_minmax.cpp
+++ b/src/glsl/opt_minmax.cpp
@@ -335,6 +335,15 @@ get_range(ir_rvalue *rval)
             high = add(r0.high, r1.high)->constant_expression_value();
          return minmax_range(low, high);
 
+      case ir_binop_sub:
+         r0 = get_range(expr->operands[0]);
+         r1 = get_range(expr->operands[1]);
+         if (r0.low && r1.high)
+            low = sub(r0.low, r1.high)->constant_expression_value();
+         if(r0.high && r1.low)
+            high = sub(r0.high, r1.low)->constant_expression_value();
+         return minmax_range(low, high);
+
       case ir_binop_pow:
          r0 = get_range(expr->operands[0]);
          if (is_greater_than_or_equal_zero(r0.low))
-- 
2.0.3