llvmpipe: Utility function to double the bit width of a type.

2 files changed, 28 insertions, 5 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_bld_type.c b/src/gallium/drivers/llvmpipe/lp_bld_type.c
index 606243d6c5a..1320a267214 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_type.c
+++ b/src/gallium/drivers/llvmpipe/lp_bld_type.c
@@ -160,12 +160,31 @@ lp_build_int_vec_type(struct lp_type type)
 struct lp_type
 lp_int_type(struct lp_type type)
 {
-   struct lp_type int_type;
+   struct lp_type res_type;
 
-   memset(&int_type, 0, sizeof int_type);
-   int_type.width = type.width;
-   int_type.length = type.length;
-   return int_type;
+   memset(&res_type, 0, sizeof res_type);
+   res_type.width = type.width;
+   res_type.length = type.length;
+
+   return res_type;
+}
+
+
+/**
+ * Return the type with twice the bit width (hence half the number of elements).
+ */
+struct lp_type
+lp_wider_type(struct lp_type type)
+{
+   struct lp_type res_type;
+
+   memcpy(&res_type, &type, sizeof res_type);
+   res_type.width *= 2;
+   res_type.length /= 2;
+
+   assert(res_type.length);
+
+   return res_type;
 }
 
 
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_type.h b/src/gallium/drivers/llvmpipe/lp_bld_type.h
index ee5ca3483c1..46c298fa206 100644
--- a/src/gallium/drivers/llvmpipe/lp_bld_type.h
+++ b/src/gallium/drivers/llvmpipe/lp_bld_type.h
@@ -166,6 +166,10 @@ struct lp_type
 lp_int_type(struct lp_type type);
 
 
+struct lp_type
+lp_wider_type(struct lp_type type);
+
+
 void
 lp_build_context_init(struct lp_build_context *bld,
                       LLVMBuilderRef builder,