--- /dev/null
+// Copyright (c) 2015 The Khronos Group Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and/or associated documentation files (the
+// "Materials"), to deal in the Materials without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Materials, and to
+// permit persons to whom the Materials are furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Materials.
+//
+// MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
+// KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
+// SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
+// https://www.khronos.org/registry/
+//
+// THE MATERIALS ARE 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 NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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
+// MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+
+#ifndef _LIBSPIRV_UTIL_BITUTILS_H_
+#define _LIBSPIRV_UTIL_BITUTILS_H_
+
+#include <cstring>
+
+namespace spvutils {
+
+// Performs a bitwise copy of source to the destination type Dest.
+template <typename Dest, typename Src>
+Dest BitwiseCast(Src source) {
+ Dest dest;
+ static_assert(sizeof(source) == sizeof(dest),
+ "BitwiseCast: Source and destination must have the same size");
+ std::memcpy(&dest, &source, sizeof(dest));
+ return dest;
+}
+
+// SetBits<T, First, Last> returns an integer of type <T> with the bits
+// between First and Last inclusive set and all other bits 0. This is indexed
+// from left to right So SetBits<unsigned long, 0, 1> would have the leftmost
+// two bits set.
+template<typename T, T First = 0, T Last = 0>
+struct SetBits {
+ static_assert(First < Last, "The first bit must be before the last bit");
+ const static T get = (T(1) << ((sizeof(T) * 8) - First - 1)) |
+ SetBits<T, First + 1, Last>::get;
+};
+
+template<typename T, T Last>
+struct SetBits<T, Last, Last> {
+ const static T get = T(1) << ((sizeof(T) * 8) - Last - 1);
+};
+
+// This is all compile-time so we can put our tests right here.
+static_assert(SetBits<uint32_t, 0, 0>::get == uint32_t(0x80000000),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 0, 1>::get == uint32_t(0xc0000000),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 1, 2>::get == uint32_t(0x60000000),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 31, 31>::get == uint32_t(0x00000001),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 31, 32>::get == uint32_t(0x00000001),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 30, 31>::get == uint32_t(0x00000003),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 0, 31>::get == uint32_t(0xFFFFFFFF),
+ "SetBits failed");
+static_assert(SetBits<uint32_t, 16, 31>::get == uint32_t(0x0000FFFF),
+ "SetBits failed");
+
+static_assert(SetBits<uint64_t, 0, 0>::get == uint64_t(0x8000000000000000LL),
+ "SetBits failed");
+static_assert(SetBits<uint64_t, 0, 1>::get == uint64_t(0xc000000000000000LL),
+ "SetBits failed");
+static_assert(SetBits<uint64_t, 32, 32>::get == uint64_t(0x0000000080000000LL),
+ "SetBits failed");
+static_assert(SetBits<uint64_t, 16, 31>::get == uint64_t(0x0000FFFF00000000LL),
+ "SetBits failed");
+
+} // namespace spvutils
+
+#endif
+++ /dev/null
-// Copyright (c) 2015 The Khronos Group Inc.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and/or associated documentation files (the
-// "Materials"), to deal in the Materials without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Materials, and to
-// permit persons to whom the Materials are furnished to do so, subject to
-// the following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Materials.
-//
-// MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
-// KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
-// SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
-// https://www.khronos.org/registry/
-//
-// THE MATERIALS ARE 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 NONINFRINGEMENT.
-// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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
-// MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
-
-#ifndef _LIBSPIRV_UTIL_BITWISECAST_H_
-#define _LIBSPIRV_UTIL_BITWISECAST_H_
-
-#include <cstring>
-
-namespace spvutils {
-
-// Performs a bitwise copy of source to the destination type Dest.
-template <typename Dest, typename Src>
-Dest BitwiseCast(Src source) {
- Dest dest;
- static_assert(sizeof(source) == sizeof(dest),
- "BitwiseCast: Source and destination must have the same size");
- std::memcpy(&dest, &source, sizeof(dest));
- return dest;
-}
-
-} // namespace spvutils
-
-#endif