1 files changed, 60 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/common/third_party/base/anglebase/numerics/safe_conversions_arm_impl.h b/gfx/angle/checkout/src/common/third_party/base/anglebase/numerics/safe_conversions_arm_impl.h
new file mode 100644
index 0000000000..74e5bcc0c6
--- /dev/null
+++ b/gfx/angle/checkout/src/common/third_party/base/anglebase/numerics/safe_conversions_arm_impl.h
@@ -0,0 +1,60 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
+#define BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
+
+#include <cassert>
+#include <limits>
+#include <type_traits>
+
+#include "anglebase/numerics/safe_conversions_impl.h"
+
+namespace angle
+{
+namespace base
+{
+namespace internal
+{
+
+// Fast saturation to a destination type.
+template <typename Dst, typename Src>
+struct SaturateFastAsmOp
+{
+    static constexpr bool is_supported =
+        std::is_signed<Src>::value && std::is_integral<Dst>::value &&
+        std::is_integral<Src>::value &&
+        IntegerBitsPlusSign<Src>::value <= IntegerBitsPlusSign<int32_t>::value &&
+        IntegerBitsPlusSign<Dst>::value <= IntegerBitsPlusSign<int32_t>::value &&
+        !IsTypeInRangeForNumericType<Dst, Src>::value;
+
+    __attribute__((always_inline)) static Dst Do(Src value)
+    {
+        int32_t src = value;
+        typename std::conditional<std::is_signed<Dst>::value, int32_t, uint32_t>::type result;
+        if (std::is_signed<Dst>::value)
+        {
+            asm("ssat %[dst], %[shift], %[src]"
+                : [dst] "=r"(result)
+                : [src] "r"(src), [shift] "n"(IntegerBitsPlusSign<Dst>::value <= 32
+                                                  ? IntegerBitsPlusSign<Dst>::value
+                                                  : 32));
+        }
+        else
+        {
+            asm("usat %[dst], %[shift], %[src]"
+                : [dst] "=r"(result)
+                : [src] "r"(src), [shift] "n"(IntegerBitsPlusSign<Dst>::value < 32
+                                                  ? IntegerBitsPlusSign<Dst>::value
+                                                  : 31));
+        }
+        return static_cast<Dst>(result);
+    }
+};
+
+}  // namespace internal
+}  // namespace base
+}  // namespace angle
+
+#endif  // BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_