Mesa (master): gallivm: added lp_build_sum_vector()

[Brian Paul]

Module: Mesa
Branch: master
Commit: 0b3bb6318ed1be7a6257125d5657b2bc03a75251
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0b3bb6318ed1be7a6257125d5657b2bc03a75251

Author: Brian Paul <brianp at vmware.com>
Date:   Thu Mar 11 16:26:12 2010 -0700

gallivm: added lp_build_sum_vector()

---

 src/gallium/auxiliary/gallivm/lp_bld_arit.c |   31 +++++++++++++++++++++++++++
 src/gallium/auxiliary/gallivm/lp_bld_arit.h |    4 +++
 2 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.c b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
index f55d2b6..90c84c6 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.c
@@ -232,6 +232,37 @@ lp_build_add(struct lp_build_context *bld,
 }
 
 
+/** Return the sum of the elements of a */
+LLVMValueRef
+lp_build_sum_vector(struct lp_build_context *bld,
+                    LLVMValueRef a)
+{
+   const struct lp_type type = bld->type;
+   LLVMValueRef index, res;
+   int i;
+
+   if (a == bld->zero)
+      return bld->zero;
+   if (a == bld->undef)
+      return bld->undef;
+   assert(type.length > 1);
+
+   assert(!bld->type.norm);
+
+   index = LLVMConstInt(LLVMInt32Type(), 0, 0);
+   res = LLVMBuildExtractElement(bld->builder, a, index, "");
+
+   for (i = 1; i < type.length; i++) {
+      index = LLVMConstInt(LLVMInt32Type(), i, 0);
+      res = LLVMBuildAdd(bld->builder, res,
+                         LLVMBuildExtractElement(bld->builder, a, index, ""),
+                         "");
+   }
+
+   return res;
+}
+
+
 /**
  * Generate a - b
  */
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit.h b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
index f14b01e..7a10fe1 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_arit.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit.h
@@ -57,6 +57,10 @@ lp_build_add(struct lp_build_context *bld,
              LLVMValueRef b);
 
 LLVMValueRef
+lp_build_sum_vector(struct lp_build_context *bld,
+                    LLVMValueRef a);
+
+LLVMValueRef
 lp_build_sub(struct lp_build_context *bld,
              LLVMValueRef a,
              LLVMValueRef b);