[Mesa-dev] [PATCH 12/22] glsl: Add ir_binop_sub to get_range

[Thomas Helland]

V2: Correct whitespace issues
    Put in alphabetic order

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
 src/glsl/opt_minmax.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/glsl/opt_minmax.cpp b/src/glsl/opt_minmax.cpp
index e4aa677..dd13800 100644
--- a/src/glsl/opt_minmax.cpp
+++ b/src/glsl/opt_minmax.cpp
@@ -422,6 +422,18 @@ get_range(ir_rvalue *rval)
          r1 = get_range(expr->operands[1]);
          return resolv_mul_range(r0, r1);
 
+      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);
+
       default:
          break;
       }
-- 
2.2.1