From: Matt Turner <mattst88@gmail.com>
Date: Thu, 5 Feb 2015 02:08:21 +0000 (-0800)
Subject: i965: Add an is_negative_one() method.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e8a6f2ad65b03eac7c030b2cd4955a162739870b;p=mesa.git

i965: Add an is_negative_one() method.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index ad2e22adbc0..f8769327883 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -731,6 +731,22 @@ backend_reg::is_one() const
           : fixed_hw_reg.dw1.d == 1;
 }
 
+bool
+backend_reg::is_negative_one() const
+{
+   if (file != IMM)
+      return false;
+
+   switch (type) {
+   case BRW_REGISTER_TYPE_F:
+      return fixed_hw_reg.dw1.f == -1.0;
+   case BRW_REGISTER_TYPE_D:
+      return fixed_hw_reg.dw1.d == -1;
+   default:
+      return false;
+   }
+}
+
 bool
 backend_reg::is_null() const
 {
diff --git a/src/mesa/drivers/dri/i965/brw_shader.h b/src/mesa/drivers/dri/i965/brw_shader.h
index 4b5c57364e8..7bff186dc49 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.h
+++ b/src/mesa/drivers/dri/i965/brw_shader.h
@@ -51,6 +51,7 @@ struct backend_reg
 #ifdef __cplusplus
    bool is_zero() const;
    bool is_one() const;
+   bool is_negative_one() const;
    bool is_null() const;
    bool is_accumulator() const;
 #endif