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/*
* Copyright 2022 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* This is an experimental (and probably temporary) solution that allows
* to compare performance SkVM blitters vs RasterPipeline blitters.
* In addition to measuring performance (which is questionable) it also produces
* other counts (pixels, scanlines) and more detailed traces that
* can explain the current results (SkVM is slower) and help improve it.
* The entire code is hidden under build flag skia_compare_vm_vs_rp=true
* and will not appear at all without it.
*/
#ifndef SkCycles_DEFINED
#define SkCycles_DEFINED
#include <cstdint>
#include <x86intrin.h>
class SkCycles {
public:
static uint64_t Now() {
#ifndef SKIA_COMPARE_VM_VS_RP
{
return 0ul;
}
#elif defined(SK_BUILD_FOR_WIN)
{
return 0ul;
}
#elif defined(SK_BUILD_FOR_IOS)
{
return 0ul;
}
#elif defined(SK_BUILD_FOR_ANDROID)
{
return 0ul;
}
#elif defined(SK_CPU_X86)
{
unsigned aux;
return __rdtscp(&aux);
}
#elif defined(SK_CPU_ARM64)
{
int64_t cycles;
asm volatile("mrs %0, cntvct_el0" : "=r"(cycles));
return cycles;
}
#else
{
return 0ul;
}
#endif
}
};
#endif // SkCycles_DEFINED
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