diff --git a/src/gallium/auxiliary/gallivm/lp_bld_flow.c b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
index 9183f457b11..c522bc4f4ab 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_flow.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
@@ -507,6 +507,25 @@ lp_build_alloca(struct gallivm_state *gallivm,
 }
 
 
+/**
+ * Like lp_build_alloca, but do not zero-initialize the variable.
+ */
+LLVMValueRef
+lp_build_alloca_undef(struct gallivm_state *gallivm,
+                      LLVMTypeRef type,
+                      const char *name)
+{
+   LLVMBuilderRef first_builder = create_builder_at_entry(gallivm);
+   LLVMValueRef res;
+
+   res = LLVMBuildAlloca(first_builder, type, name);
+
+   LLVMDisposeBuilder(first_builder);
+
+   return res;
+}
+
+
 /**
  * Allocate an array of scalars/vectors.
  *
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_flow.h b/src/gallium/auxiliary/gallivm/lp_bld_flow.h
index 083b0ad9fec..674fc189f1a 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_flow.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_flow.h
@@ -195,6 +195,11 @@ lp_build_alloca(struct gallivm_state *gallivm,
                 LLVMTypeRef type,
                 const char *name);
 
+LLVMValueRef
+lp_build_alloca_undef(struct gallivm_state *gallivm,
+                      LLVMTypeRef type,
+                      const char *name);
+
 LLVMValueRef
 lp_build_array_alloca(struct gallivm_state *gallivm,
                       LLVMTypeRef type,