| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkJumper_misc_DEFINED |
| #define SkJumper_misc_DEFINED |
| |
| #include "SkJumper.h" // for memcpy() |
| |
| // Miscellany used by SkJumper_stages.cpp and SkJumper_vectors.h. |
| |
| // Every function in this file should be marked static and inline using SI. |
| #define SI static inline |
| |
| template <typename T, typename P> |
| SI T unaligned_load(const P* p) { // const void* would work too, but const P* helps ARMv7 codegen. |
| T v; |
| memcpy(&v, p, sizeof(v)); |
| return v; |
| } |
| |
| template <typename Dst, typename Src> |
| SI Dst bit_cast(const Src& src) { |
| static_assert(sizeof(Dst) == sizeof(Src), ""); |
| return unaligned_load<Dst>(&src); |
| } |
| |
| template <typename Dst, typename Src> |
| SI Dst widen_cast(const Src& src) { |
| static_assert(sizeof(Dst) > sizeof(Src), ""); |
| Dst dst; |
| memcpy(&dst, &src, sizeof(Src)); |
| return dst; |
| } |
| |
| // A couple functions for embedding constants directly into code, |
| // so that no .const or .literal4 section is created. |
| SI int C(int x) { |
| #if defined(JUMPER) && defined(__x86_64__) |
| // Move x-the-compile-time-constant as a literal into x-the-register. |
| asm("mov %1, %0" : "=r"(x) : "i"(x)); |
| #endif |
| return x; |
| } |
| SI float C(float f) { |
| int x = C(unaligned_load<int>(&f)); |
| return unaligned_load<float>(&x); |
| } |
| |
| // Syntax sugar to make C() easy to use for constant literals. |
| SI int operator "" _i(unsigned long long int i) { return C( (int)i); } |
| SI float operator "" _f( long double f) { return C((float)f); } |
| |
| #endif//SkJumper_misc_DEFINED |