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/*
* 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
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