Mesa (master): llvmpipe: Utility function to double the bit width of a type .

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: 4458695bdafb13eba639d986e2f20953f0f7445c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4458695bdafb13eba639d986e2f20953f0f7445c

Author: José Fonseca <jfonseca at vmware.com>
Date:   Thu Oct 22 18:28:37 2009 +0100

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

---

 src/gallium/drivers/llvmpipe/lp_bld_type.c |   29 +++++++++++++++++++++++----
 src/gallium/drivers/llvmpipe/lp_bld_type.h |    4 +++
 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 606243d..1320a26 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 ee5ca34..46c298f 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,