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kern: optimize timespan -> tick codegen, improve .text layout

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This commit is contained in:
Michael Scire
2021-10-24 01:04:19 -07:00
parent 89926f44c6
commit aaa3770806
5 changed files with 88 additions and 45 deletions
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83
libraries/libvapours/include/vapours/svc/svc_tick.hpp
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@@ -23,50 +23,71 @@ namespace ams::svc {
class Tick {
public:
static constexpr s64 TicksPerSecond = ::ams::svc::TicksPerSecond;
static constexpr s64 GetTicksPerSecond() { return TicksPerSecond; }
static consteval s64 GetTicksPerSecond() { return TicksPerSecond; }
private:
s64 m_tick;
private:
static constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
static constexpr void DivNs(s64 &out, const s64 value) {
out = value / NanoSecondsPerSecond;
}
static constexpr ALWAYS_INLINE s64 ConvertTimeSpanToTickImpl(TimeSpan ts) {
/* Get nano-seconds. */
const s64 ns = ts.GetNanoSeconds();
static constexpr void DivModNs(s64 &out_div, s64 &out_mod, const s64 value) {
out_div = value / NanoSecondsPerSecond;
out_mod = value % NanoSecondsPerSecond;
}
/* Special-case optimize arm64/nintendo-nx value. */
if (!std::is_constant_evaluated()) {
if constexpr (TicksPerSecond == 19'200'000) {
#if defined(ATMOSPHERE_IS_MESOSPHERE) && defined(ATMOSPHERE_ARCH_ARM64)
s64 t0, t1, t2, t3;
__asm__ __volatile__("mov %[t1], #0x5A53\n"
"movk %[t1], #0xA09B, lsl #16\n"
"lsr %[t0], %[ns], #9\n"
"movk %[t1], #0xB82F, lsl #32\n"
"movk %[t1], #0x0044, lsl #48\n"
"umulh %[t0], %[t0], %[t1]\n"
"mov %[t1], #0xFFFFFFFFFFFF3600\n"
"movk %[t1], #0xC465, lsl #16\n"
"lsr %[t0], %[t0], #0xB\n"
"madd %[t1], %[t0], %[t1], %[ns]\n"
"mov %w[t2], #0xF800\n"
"movk %w[t2], #0x0124, lsl #16\n"
"mov %w[t3], #0xCA00\n"
"movk %w[t3], #0x3B9A, lsl #16\n"
"madd %[t1], %[t1], %[t2], %[t3]\n"
"mov %[t3], #0x94B3\n"
"movk %[t3], #0x26D6, lsl #16\n"
"movk %[t3], #0x0BE8, lsl #32\n"
"movk %[t3], #0x112E, lsl #48\n"
"sub %[t1], %[t1], #1\n"
"smulh %[t1], %[t1], %[t3]\n"
"asr %[t3], %[t1], #26\n"
"add %[t1], %[t3], %[t1], lsr #63\n"
"madd %[t0], %[t0], %[t2], %[t1]\n"
: [t0]"=&r"(t0), [t1]"=&r"(t1), [t2]"=&r"(t2), [t3]"=&r"(t3)
: [ns]"r"(ns)
: "cc");
return t0;
#endif
}
}
static constexpr s64 ConvertTimeSpanToTickImpl(TimeSpan ts) {
/* Split up timespan and ticks-per-second by ns. */
s64 ts_div = 0, ts_mod = 0;
s64 tick_div = 0, tick_mod = 0;
DivModNs(ts_div, ts_mod, ts.GetNanoSeconds());
DivModNs(tick_div, tick_mod, TicksPerSecond);
/* Convert the timespan into a tick count. */
s64 value = 0;
DivNs(value, ts_mod * tick_mod + NanoSecondsPerSecond - 1);
return (ts_div * tick_div) * NanoSecondsPerSecond + ts_div * tick_mod + ts_mod * tick_div + value;
return util::ScaleByConstantFactor<s64, TicksPerSecond, NanoSecondsPerSecond>(ns);
}
public:
constexpr explicit Tick(s64 t = 0) : m_tick(t) { /* ... */ }
constexpr Tick(TimeSpan ts) : m_tick(ConvertTimeSpanToTickImpl(ts)) { /* ... */ }
constexpr ALWAYS_INLINE explicit Tick(s64 t = 0) : m_tick(t) { /* ... */ }
constexpr ALWAYS_INLINE Tick(TimeSpan ts) : m_tick(ConvertTimeSpanToTickImpl(ts)) { /* ... */ }
constexpr operator s64() const { return m_tick; }
constexpr ALWAYS_INLINE operator s64() const { return m_tick; }
/* Tick arithmetic. */
constexpr Tick &operator+=(Tick rhs) { m_tick += rhs.m_tick; return *this; }
constexpr Tick &operator-=(Tick rhs) { m_tick -= rhs.m_tick; return *this; }
constexpr Tick operator+(Tick rhs) const { Tick r(*this); return r += rhs; }
constexpr Tick operator-(Tick rhs) const { Tick r(*this); return r -= rhs; }
constexpr ALWAYS_INLINE Tick &operator+=(Tick rhs) { m_tick += rhs.m_tick; return *this; }
constexpr ALWAYS_INLINE Tick &operator-=(Tick rhs) { m_tick -= rhs.m_tick; return *this; }
constexpr ALWAYS_INLINE Tick operator+(Tick rhs) const { Tick r(*this); return r += rhs; }
constexpr ALWAYS_INLINE Tick operator-(Tick rhs) const { Tick r(*this); return r -= rhs; }
constexpr Tick &operator+=(TimeSpan rhs) { m_tick += Tick(rhs).m_tick; return *this; }
constexpr Tick &operator-=(TimeSpan rhs) { m_tick -= Tick(rhs).m_tick; return *this; }
constexpr Tick operator+(TimeSpan rhs) const { Tick r(*this); return r += rhs; }
constexpr Tick operator-(TimeSpan rhs) const { Tick r(*this); return r -= rhs; }
constexpr ALWAYS_INLINE Tick &operator+=(TimeSpan rhs) { m_tick += Tick(rhs).m_tick; return *this; }
constexpr ALWAYS_INLINE Tick &operator-=(TimeSpan rhs) { m_tick -= Tick(rhs).m_tick; return *this; }
constexpr ALWAYS_INLINE Tick operator+(TimeSpan rhs) const { Tick r(*this); return r += rhs; }
constexpr ALWAYS_INLINE Tick operator-(TimeSpan rhs) const { Tick r(*this); return r -= rhs; }
};
}