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Eliminates call/return cost on WrappedInts.

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Thomas Harte 2019-07-07 14:12:20 -04:00
parent 96c0253ee2
commit dd963d6161
1 changed files with 37 additions and 35 deletions
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72
ClockReceiver/ClockReceiver.hpp
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@ -9,6 +9,8 @@
#ifndef ClockReceiver_hpp #ifndef ClockReceiver_hpp
#define ClockReceiver_hpp #define ClockReceiver_hpp
#include "ForceInline.hpp"
/* /*
Informal pattern for all classes that run from a clock cycle: Informal pattern for all classes that run from a clock cycle:
@ -55,89 +57,89 @@ template <class T> class WrappedInt {
constexpr WrappedInt(int l) : length_(l) {} constexpr WrappedInt(int l) : length_(l) {}
constexpr WrappedInt() : length_(0) {} constexpr WrappedInt() : length_(0) {}
T &operator =(const T &rhs) { forceinline T &operator =(const T &rhs) {
length_ = rhs.length_; length_ = rhs.length_;
return *this; return *this;
} }
T &operator +=(const T &rhs) { forceinline T &operator +=(const T &rhs) {
length_ += rhs.length_; length_ += rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator -=(const T &rhs) { forceinline T &operator -=(const T &rhs) {
length_ -= rhs.length_; length_ -= rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator ++() { forceinline T &operator ++() {
++ length_; ++ length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator ++(int) { forceinline T &operator ++(int) {
length_ ++; length_ ++;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator --() { forceinline T &operator --() {
-- length_; -- length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator --(int) { forceinline T &operator --(int) {
length_ --; length_ --;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator *=(const T &rhs) { forceinline T &operator *=(const T &rhs) {
length_ *= rhs.length_; length_ *= rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator /=(const T &rhs) { forceinline T &operator /=(const T &rhs) {
length_ /= rhs.length_; length_ /= rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator %=(const T &rhs) { forceinline T &operator %=(const T &rhs) {
length_ %= rhs.length_; length_ %= rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
T &operator &=(const T &rhs) { forceinline T &operator &=(const T &rhs) {
length_ &= rhs.length_; length_ &= rhs.length_;
return *static_cast<T *>(this); return *static_cast<T *>(this);
} }
constexpr T operator +(const T &rhs) const { return T(length_ + rhs.length_); } forceinline constexpr T operator +(const T &rhs) const { return T(length_ + rhs.length_); }
constexpr T operator -(const T &rhs) const { return T(length_ - rhs.length_); } forceinline constexpr T operator -(const T &rhs) const { return T(length_ - rhs.length_); }
constexpr T operator *(const T &rhs) const { return T(length_ * rhs.length_); } forceinline constexpr T operator *(const T &rhs) const { return T(length_ * rhs.length_); }
constexpr T operator /(const T &rhs) const { return T(length_ / rhs.length_); } forceinline constexpr T operator /(const T &rhs) const { return T(length_ / rhs.length_); }
constexpr T operator %(const T &rhs) const { return T(length_ % rhs.length_); } forceinline constexpr T operator %(const T &rhs) const { return T(length_ % rhs.length_); }
constexpr T operator &(const T &rhs) const { return T(length_ & rhs.length_); } forceinline constexpr T operator &(const T &rhs) const { return T(length_ & rhs.length_); }
constexpr T operator -() const { return T(- length_); } forceinline constexpr T operator -() const { return T(- length_); }
constexpr bool operator <(const T &rhs) const { return length_ < rhs.length_; } forceinline constexpr bool operator <(const T &rhs) const { return length_ < rhs.length_; }
constexpr bool operator >(const T &rhs) const { return length_ > rhs.length_; } forceinline constexpr bool operator >(const T &rhs) const { return length_ > rhs.length_; }
constexpr bool operator <=(const T &rhs) const { return length_ <= rhs.length_; } forceinline constexpr bool operator <=(const T &rhs) const { return length_ <= rhs.length_; }
constexpr bool operator >=(const T &rhs) const { return length_ >= rhs.length_; } forceinline constexpr bool operator >=(const T &rhs) const { return length_ >= rhs.length_; }
constexpr bool operator ==(const T &rhs) const { return length_ == rhs.length_; } forceinline constexpr bool operator ==(const T &rhs) const { return length_ == rhs.length_; }
constexpr bool operator !=(const T &rhs) const { return length_ != rhs.length_; } forceinline constexpr bool operator !=(const T &rhs) const { return length_ != rhs.length_; }
constexpr bool operator !() const { return !length_; } forceinline constexpr bool operator !() const { return !length_; }
// bool operator () is not supported because it offers an implicit cast to int, which is prone silently to permit misuse // bool operator () is not supported because it offers an implicit cast to int, which is prone silently to permit misuse
constexpr int as_int() const { return length_; } forceinline constexpr int as_int() const { return length_; }
/*! /*!
Severs from @c this the effect of dividing by @c divisor; @c this will end up with Severs from @c this the effect of dividing by @c divisor; @c this will end up with
the value of @c this modulo @c divisor and @c divided by @c divisor is returned. the value of @c this modulo @c divisor and @c divided by @c divisor is returned.
*/ */
T divide(const T &divisor) { forceinline T divide(const T &divisor) {
T result(length_ / divisor.length_); T result(length_ / divisor.length_);
length_ %= divisor.length_; length_ %= divisor.length_;
return result; return result;
@ -147,7 +149,7 @@ template <class T> class WrappedInt {
Flushes the value in @c this. The current value is returned, and the internal value Flushes the value in @c this. The current value is returned, and the internal value
is reset to zero. is reset to zero.
*/ */
T flush() { forceinline T flush() {
T result(length_); T result(length_);
length_ = 0; length_ = 0;
return result; return result;
@ -178,19 +180,19 @@ class HalfCycles: public WrappedInt<HalfCycles> {
constexpr HalfCycles(const HalfCycles &half_cycles) : WrappedInt<HalfCycles>(half_cycles.length_) {} constexpr HalfCycles(const HalfCycles &half_cycles) : WrappedInt<HalfCycles>(half_cycles.length_) {}
/// @returns The number of whole cycles completely covered by this span of half cycles. /// @returns The number of whole cycles completely covered by this span of half cycles.
constexpr Cycles cycles() const { forceinline constexpr Cycles cycles() const {
return Cycles(length_ >> 1); return Cycles(length_ >> 1);
} }
/// Flushes the whole cycles in @c this, subtracting that many from the total stored here. /// Flushes the whole cycles in @c this, subtracting that many from the total stored here.
Cycles flush_cycles() { forceinline Cycles flush_cycles() {
Cycles result(length_ >> 1); Cycles result(length_ >> 1);
length_ &= 1; length_ &= 1;
return result; return result;
} }
/// Flushes the half cycles in @c this, returning the number stored and setting this total to zero. /// Flushes the half cycles in @c this, returning the number stored and setting this total to zero.
HalfCycles flush() { forceinline HalfCycles flush() {
HalfCycles result(length_); HalfCycles result(length_);
length_ = 0; length_ = 0;
return result; return result;
@ -200,9 +202,9 @@ class HalfCycles: public WrappedInt<HalfCycles> {
Severs from @c this the effect of dividing by @c divisor; @c this will end up with Severs from @c this the effect of dividing by @c divisor; @c this will end up with
the value of @c this modulo @c divisor and @c divided by @c divisor is returned. the value of @c this modulo @c divisor and @c divided by @c divisor is returned.
*/ */
Cycles divide_cycles(const Cycles &divisor) { forceinline Cycles divide_cycles(const Cycles &divisor) {
HalfCycles half_divisor = HalfCycles(divisor); const HalfCycles half_divisor = HalfCycles(divisor);
Cycles result(length_ / half_divisor.length_); const Cycles result(length_ / half_divisor.length_);
length_ %= half_divisor.length_; length_ %= half_divisor.length_;
return result; return result;
} }
@ -216,7 +218,7 @@ template <class T> class HalfClockReceiver: public T {
public: public:
using T::T; using T::T;
inline void run_for(const HalfCycles half_cycles) { forceinline void run_for(const HalfCycles half_cycles) {
half_cycles_ += half_cycles; half_cycles_ += half_cycles;
T::run_for(half_cycles_.flush_cycles()); T::run_for(half_cycles_.flush_cycles());
} }