draw/gallivm: export overflow arithmetic to its own file

We'll be reusing this code so lets put it in a common file
and use it in the draw module.

Signed-off-by: Zack Rusin <[email protected]>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_arit_overflow.h b/src/gallium/auxiliary/gallivm/lp_bld_arit_overflow.h
new file mode 100644
index 00000000000..8c35a04181b
--- /dev/null
+++ b/src/gallium/auxiliary/gallivm/lp_bld_arit_overflow.h
@@ -0,0 +1,57 @@
+/**************************************************************************
+ *
+ * Copyright 2013 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Helper arithmetic functions with support for overflow detection
+ * and reporting.
+ *
+ * @author Zack Rusin <[email protected]>
+ */
+
+
+#ifndef LP_BLD_ARIT_OVERFLOW_H
+#define LP_BLD_ARIT_OVERFLOW_H
+
+
+#include "gallivm/lp_bld.h"
+
+struct gallivm_state;
+
+LLVMValueRef
+lp_build_uadd_overflow(struct gallivm_state *gallivm,
+                       LLVMValueRef a,
+                       LLVMValueRef b,
+                       LLVMValueRef *ofbit);
+
+LLVMValueRef
+lp_build_umul_overflow(struct gallivm_state *gallivm,
+                       LLVMValueRef a,
+                       LLVMValueRef b,
+                       LLVMValueRef *ofbit);
+
+#endif /* !LP_BLD_ARIT_OVERFLOW_H */