
(FPCore (x y z t a) :precision binary64 (+ x (/ (* (- y z) t) (- a z))))
double code(double x, double y, double z, double t, double a) {
return x + (((y - z) * t) / (a - z));
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
code = x + (((y - z) * t) / (a - z))
end function
public static double code(double x, double y, double z, double t, double a) {
return x + (((y - z) * t) / (a - z));
}
def code(x, y, z, t, a): return x + (((y - z) * t) / (a - z))
function code(x, y, z, t, a) return Float64(x + Float64(Float64(Float64(y - z) * t) / Float64(a - z))) end
function tmp = code(x, y, z, t, a) tmp = x + (((y - z) * t) / (a - z)); end
code[x_, y_, z_, t_, a_] := N[(x + N[(N[(N[(y - z), $MachinePrecision] * t), $MachinePrecision] / N[(a - z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
x + \frac{\left(y - z\right) \cdot t}{a - z}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 9 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (x y z t a) :precision binary64 (+ x (/ (* (- y z) t) (- a z))))
double code(double x, double y, double z, double t, double a) {
return x + (((y - z) * t) / (a - z));
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
code = x + (((y - z) * t) / (a - z))
end function
public static double code(double x, double y, double z, double t, double a) {
return x + (((y - z) * t) / (a - z));
}
def code(x, y, z, t, a): return x + (((y - z) * t) / (a - z))
function code(x, y, z, t, a) return Float64(x + Float64(Float64(Float64(y - z) * t) / Float64(a - z))) end
function tmp = code(x, y, z, t, a) tmp = x + (((y - z) * t) / (a - z)); end
code[x_, y_, z_, t_, a_] := N[(x + N[(N[(N[(y - z), $MachinePrecision] * t), $MachinePrecision] / N[(a - z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
x + \frac{\left(y - z\right) \cdot t}{a - z}
\end{array}
(FPCore (x y z t a) :precision binary64 (fma (/ t (- a z)) (- y z) x))
double code(double x, double y, double z, double t, double a) {
return fma((t / (a - z)), (y - z), x);
}
function code(x, y, z, t, a) return fma(Float64(t / Float64(a - z)), Float64(y - z), x) end
code[x_, y_, z_, t_, a_] := N[(N[(t / N[(a - z), $MachinePrecision]), $MachinePrecision] * N[(y - z), $MachinePrecision] + x), $MachinePrecision]
\begin{array}{l}
\\
\mathsf{fma}\left(\frac{t}{a - z}, y - z, x\right)
\end{array}
Initial program 83.6%
+-commutativeN/A
associate-/l*N/A
*-commutativeN/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f64N/A
--lowering--.f64N/A
--lowering--.f6497.2
Applied egg-rr97.2%
(FPCore (x y z t a) :precision binary64 (let* ((t_1 (fma t (- 1.0 (/ y z)) x))) (if (<= z -3.3e-103) t_1 (if (<= z 2.5e-105) (fma (/ t a) (- y z) x) t_1))))
double code(double x, double y, double z, double t, double a) {
double t_1 = fma(t, (1.0 - (y / z)), x);
double tmp;
if (z <= -3.3e-103) {
tmp = t_1;
} else if (z <= 2.5e-105) {
tmp = fma((t / a), (y - z), x);
} else {
tmp = t_1;
}
return tmp;
}
function code(x, y, z, t, a) t_1 = fma(t, Float64(1.0 - Float64(y / z)), x) tmp = 0.0 if (z <= -3.3e-103) tmp = t_1; elseif (z <= 2.5e-105) tmp = fma(Float64(t / a), Float64(y - z), x); else tmp = t_1; end return tmp end
code[x_, y_, z_, t_, a_] := Block[{t$95$1 = N[(t * N[(1.0 - N[(y / z), $MachinePrecision]), $MachinePrecision] + x), $MachinePrecision]}, If[LessEqual[z, -3.3e-103], t$95$1, If[LessEqual[z, 2.5e-105], N[(N[(t / a), $MachinePrecision] * N[(y - z), $MachinePrecision] + x), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \mathsf{fma}\left(t, 1 - \frac{y}{z}, x\right)\\
\mathbf{if}\;z \leq -3.3 \cdot 10^{-103}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;z \leq 2.5 \cdot 10^{-105}:\\
\;\;\;\;\mathsf{fma}\left(\frac{t}{a}, y - z, x\right)\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if z < -3.2999999999999999e-103 or 2.49999999999999982e-105 < z Initial program 78.7%
Taylor expanded in a around 0
+-commutativeN/A
mul-1-negN/A
associate-/l*N/A
distribute-rgt-neg-inN/A
accelerator-lowering-fma.f64N/A
neg-sub0N/A
div-subN/A
*-inversesN/A
associate-+l-N/A
neg-sub0N/A
mul-1-negN/A
+-commutativeN/A
mul-1-negN/A
unsub-negN/A
--lowering--.f64N/A
/-lowering-/.f6482.6
Simplified82.6%
if -3.2999999999999999e-103 < z < 2.49999999999999982e-105Initial program 97.2%
Taylor expanded in a around inf
+-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f64N/A
--lowering--.f6487.7
Simplified87.7%
clear-numN/A
associate-*r/N/A
div-invN/A
times-fracN/A
flip--N/A
clear-numN/A
clear-numN/A
flip--N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f64N/A
--lowering--.f6490.4
Applied egg-rr90.4%
(FPCore (x y z t a) :precision binary64 (let* ((t_1 (fma t (- 1.0 (/ y z)) x))) (if (<= z -3e-103) t_1 (if (<= z 4.2e-105) (fma y (/ t a) x) t_1))))
double code(double x, double y, double z, double t, double a) {
double t_1 = fma(t, (1.0 - (y / z)), x);
double tmp;
if (z <= -3e-103) {
tmp = t_1;
} else if (z <= 4.2e-105) {
tmp = fma(y, (t / a), x);
} else {
tmp = t_1;
}
return tmp;
}
function code(x, y, z, t, a) t_1 = fma(t, Float64(1.0 - Float64(y / z)), x) tmp = 0.0 if (z <= -3e-103) tmp = t_1; elseif (z <= 4.2e-105) tmp = fma(y, Float64(t / a), x); else tmp = t_1; end return tmp end
code[x_, y_, z_, t_, a_] := Block[{t$95$1 = N[(t * N[(1.0 - N[(y / z), $MachinePrecision]), $MachinePrecision] + x), $MachinePrecision]}, If[LessEqual[z, -3e-103], t$95$1, If[LessEqual[z, 4.2e-105], N[(y * N[(t / a), $MachinePrecision] + x), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := \mathsf{fma}\left(t, 1 - \frac{y}{z}, x\right)\\
\mathbf{if}\;z \leq -3 \cdot 10^{-103}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;z \leq 4.2 \cdot 10^{-105}:\\
\;\;\;\;\mathsf{fma}\left(y, \frac{t}{a}, x\right)\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
if z < -3e-103 or 4.2e-105 < z Initial program 78.7%
Taylor expanded in a around 0
+-commutativeN/A
mul-1-negN/A
associate-/l*N/A
distribute-rgt-neg-inN/A
accelerator-lowering-fma.f64N/A
neg-sub0N/A
div-subN/A
*-inversesN/A
associate-+l-N/A
neg-sub0N/A
mul-1-negN/A
+-commutativeN/A
mul-1-negN/A
unsub-negN/A
--lowering--.f64N/A
/-lowering-/.f6482.6
Simplified82.6%
if -3e-103 < z < 4.2e-105Initial program 97.2%
Taylor expanded in z around 0
+-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f6486.7
Simplified86.7%
associate-*r/N/A
*-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f6489.5
Applied egg-rr89.5%
(FPCore (x y z t a) :precision binary64 (if (<= z -5.2e+30) (+ t x) (if (<= z 1.22e+44) (fma y (/ t a) x) (+ t x))))
double code(double x, double y, double z, double t, double a) {
double tmp;
if (z <= -5.2e+30) {
tmp = t + x;
} else if (z <= 1.22e+44) {
tmp = fma(y, (t / a), x);
} else {
tmp = t + x;
}
return tmp;
}
function code(x, y, z, t, a) tmp = 0.0 if (z <= -5.2e+30) tmp = Float64(t + x); elseif (z <= 1.22e+44) tmp = fma(y, Float64(t / a), x); else tmp = Float64(t + x); end return tmp end
code[x_, y_, z_, t_, a_] := If[LessEqual[z, -5.2e+30], N[(t + x), $MachinePrecision], If[LessEqual[z, 1.22e+44], N[(y * N[(t / a), $MachinePrecision] + x), $MachinePrecision], N[(t + x), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;z \leq -5.2 \cdot 10^{+30}:\\
\;\;\;\;t + x\\
\mathbf{elif}\;z \leq 1.22 \cdot 10^{+44}:\\
\;\;\;\;\mathsf{fma}\left(y, \frac{t}{a}, x\right)\\
\mathbf{else}:\\
\;\;\;\;t + x\\
\end{array}
\end{array}
if z < -5.19999999999999977e30 or 1.22e44 < z Initial program 69.8%
Taylor expanded in z around inf
Simplified81.9%
if -5.19999999999999977e30 < z < 1.22e44Initial program 96.9%
Taylor expanded in z around 0
+-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f6473.3
Simplified73.3%
associate-*r/N/A
*-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f6474.6
Applied egg-rr74.6%
Final simplification78.2%
(FPCore (x y z t a) :precision binary64 (if (<= z -2.05e+114) (+ t x) (if (<= z 3.2e+44) (fma t (/ y a) x) (+ t x))))
double code(double x, double y, double z, double t, double a) {
double tmp;
if (z <= -2.05e+114) {
tmp = t + x;
} else if (z <= 3.2e+44) {
tmp = fma(t, (y / a), x);
} else {
tmp = t + x;
}
return tmp;
}
function code(x, y, z, t, a) tmp = 0.0 if (z <= -2.05e+114) tmp = Float64(t + x); elseif (z <= 3.2e+44) tmp = fma(t, Float64(y / a), x); else tmp = Float64(t + x); end return tmp end
code[x_, y_, z_, t_, a_] := If[LessEqual[z, -2.05e+114], N[(t + x), $MachinePrecision], If[LessEqual[z, 3.2e+44], N[(t * N[(y / a), $MachinePrecision] + x), $MachinePrecision], N[(t + x), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;z \leq -2.05 \cdot 10^{+114}:\\
\;\;\;\;t + x\\
\mathbf{elif}\;z \leq 3.2 \cdot 10^{+44}:\\
\;\;\;\;\mathsf{fma}\left(t, \frac{y}{a}, x\right)\\
\mathbf{else}:\\
\;\;\;\;t + x\\
\end{array}
\end{array}
if z < -2.05e114 or 3.20000000000000004e44 < z Initial program 67.5%
Taylor expanded in z around inf
Simplified85.1%
if -2.05e114 < z < 3.20000000000000004e44Initial program 96.5%
Taylor expanded in z around 0
+-commutativeN/A
associate-/l*N/A
accelerator-lowering-fma.f64N/A
/-lowering-/.f6471.5
Simplified71.5%
Final simplification77.5%
(FPCore (x y z t a) :precision binary64 (if (<= y -1.65e+234) (* y (/ t a)) (+ t x)))
double code(double x, double y, double z, double t, double a) {
double tmp;
if (y <= -1.65e+234) {
tmp = y * (t / a);
} else {
tmp = t + x;
}
return tmp;
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
real(8) :: tmp
if (y <= (-1.65d+234)) then
tmp = y * (t / a)
else
tmp = t + x
end if
code = tmp
end function
public static double code(double x, double y, double z, double t, double a) {
double tmp;
if (y <= -1.65e+234) {
tmp = y * (t / a);
} else {
tmp = t + x;
}
return tmp;
}
def code(x, y, z, t, a): tmp = 0 if y <= -1.65e+234: tmp = y * (t / a) else: tmp = t + x return tmp
function code(x, y, z, t, a) tmp = 0.0 if (y <= -1.65e+234) tmp = Float64(y * Float64(t / a)); else tmp = Float64(t + x); end return tmp end
function tmp_2 = code(x, y, z, t, a) tmp = 0.0; if (y <= -1.65e+234) tmp = y * (t / a); else tmp = t + x; end tmp_2 = tmp; end
code[x_, y_, z_, t_, a_] := If[LessEqual[y, -1.65e+234], N[(y * N[(t / a), $MachinePrecision]), $MachinePrecision], N[(t + x), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;y \leq -1.65 \cdot 10^{+234}:\\
\;\;\;\;y \cdot \frac{t}{a}\\
\mathbf{else}:\\
\;\;\;\;t + x\\
\end{array}
\end{array}
if y < -1.6500000000000001e234Initial program 68.7%
Taylor expanded in y around inf
/-lowering-/.f64N/A
*-lowering-*.f64N/A
--lowering--.f6463.0
Simplified63.0%
Taylor expanded in a around inf
Simplified46.8%
associate-*l/N/A
un-div-invN/A
*-commutativeN/A
*-lowering-*.f64N/A
*-commutativeN/A
un-div-invN/A
/-lowering-/.f6457.0
Applied egg-rr57.0%
if -1.6500000000000001e234 < y Initial program 84.7%
Taylor expanded in z around inf
Simplified69.8%
Final simplification68.9%
(FPCore (x y z t a) :precision binary64 (if (<= x -7e-153) x (if (<= x 1.65e-182) t x)))
double code(double x, double y, double z, double t, double a) {
double tmp;
if (x <= -7e-153) {
tmp = x;
} else if (x <= 1.65e-182) {
tmp = t;
} else {
tmp = x;
}
return tmp;
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
real(8) :: tmp
if (x <= (-7d-153)) then
tmp = x
else if (x <= 1.65d-182) then
tmp = t
else
tmp = x
end if
code = tmp
end function
public static double code(double x, double y, double z, double t, double a) {
double tmp;
if (x <= -7e-153) {
tmp = x;
} else if (x <= 1.65e-182) {
tmp = t;
} else {
tmp = x;
}
return tmp;
}
def code(x, y, z, t, a): tmp = 0 if x <= -7e-153: tmp = x elif x <= 1.65e-182: tmp = t else: tmp = x return tmp
function code(x, y, z, t, a) tmp = 0.0 if (x <= -7e-153) tmp = x; elseif (x <= 1.65e-182) tmp = t; else tmp = x; end return tmp end
function tmp_2 = code(x, y, z, t, a) tmp = 0.0; if (x <= -7e-153) tmp = x; elseif (x <= 1.65e-182) tmp = t; else tmp = x; end tmp_2 = tmp; end
code[x_, y_, z_, t_, a_] := If[LessEqual[x, -7e-153], x, If[LessEqual[x, 1.65e-182], t, x]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;x \leq -7 \cdot 10^{-153}:\\
\;\;\;\;x\\
\mathbf{elif}\;x \leq 1.65 \cdot 10^{-182}:\\
\;\;\;\;t\\
\mathbf{else}:\\
\;\;\;\;x\\
\end{array}
\end{array}
if x < -6.99999999999999961e-153 or 1.64999999999999998e-182 < x Initial program 84.5%
Taylor expanded in x around inf
Simplified65.1%
if -6.99999999999999961e-153 < x < 1.64999999999999998e-182Initial program 80.9%
Taylor expanded in z around inf
Simplified56.9%
Taylor expanded in x around 0
Simplified45.5%
(FPCore (x y z t a) :precision binary64 (if (<= a 6.5e+191) (+ t x) x))
double code(double x, double y, double z, double t, double a) {
double tmp;
if (a <= 6.5e+191) {
tmp = t + x;
} else {
tmp = x;
}
return tmp;
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
real(8) :: tmp
if (a <= 6.5d+191) then
tmp = t + x
else
tmp = x
end if
code = tmp
end function
public static double code(double x, double y, double z, double t, double a) {
double tmp;
if (a <= 6.5e+191) {
tmp = t + x;
} else {
tmp = x;
}
return tmp;
}
def code(x, y, z, t, a): tmp = 0 if a <= 6.5e+191: tmp = t + x else: tmp = x return tmp
function code(x, y, z, t, a) tmp = 0.0 if (a <= 6.5e+191) tmp = Float64(t + x); else tmp = x; end return tmp end
function tmp_2 = code(x, y, z, t, a) tmp = 0.0; if (a <= 6.5e+191) tmp = t + x; else tmp = x; end tmp_2 = tmp; end
code[x_, y_, z_, t_, a_] := If[LessEqual[a, 6.5e+191], N[(t + x), $MachinePrecision], x]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;a \leq 6.5 \cdot 10^{+191}:\\
\;\;\;\;t + x\\
\mathbf{else}:\\
\;\;\;\;x\\
\end{array}
\end{array}
if a < 6.50000000000000008e191Initial program 84.4%
Taylor expanded in z around inf
Simplified66.6%
if 6.50000000000000008e191 < a Initial program 75.8%
Taylor expanded in x around inf
Simplified73.8%
Final simplification67.3%
(FPCore (x y z t a) :precision binary64 t)
double code(double x, double y, double z, double t, double a) {
return t;
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
code = t
end function
public static double code(double x, double y, double z, double t, double a) {
return t;
}
def code(x, y, z, t, a): return t
function code(x, y, z, t, a) return t end
function tmp = code(x, y, z, t, a) tmp = t; end
code[x_, y_, z_, t_, a_] := t
\begin{array}{l}
\\
t
\end{array}
Initial program 83.6%
Taylor expanded in z around inf
Simplified65.7%
Taylor expanded in x around 0
Simplified20.4%
(FPCore (x y z t a)
:precision binary64
(let* ((t_1 (+ x (* (/ (- y z) (- a z)) t))))
(if (< t -1.0682974490174067e-39)
t_1
(if (< t 3.9110949887586375e-141) (+ x (/ (* (- y z) t) (- a z))) t_1))))
double code(double x, double y, double z, double t, double a) {
double t_1 = x + (((y - z) / (a - z)) * t);
double tmp;
if (t < -1.0682974490174067e-39) {
tmp = t_1;
} else if (t < 3.9110949887586375e-141) {
tmp = x + (((y - z) * t) / (a - z));
} else {
tmp = t_1;
}
return tmp;
}
real(8) function code(x, y, z, t, a)
real(8), intent (in) :: x
real(8), intent (in) :: y
real(8), intent (in) :: z
real(8), intent (in) :: t
real(8), intent (in) :: a
real(8) :: t_1
real(8) :: tmp
t_1 = x + (((y - z) / (a - z)) * t)
if (t < (-1.0682974490174067d-39)) then
tmp = t_1
else if (t < 3.9110949887586375d-141) then
tmp = x + (((y - z) * t) / (a - z))
else
tmp = t_1
end if
code = tmp
end function
public static double code(double x, double y, double z, double t, double a) {
double t_1 = x + (((y - z) / (a - z)) * t);
double tmp;
if (t < -1.0682974490174067e-39) {
tmp = t_1;
} else if (t < 3.9110949887586375e-141) {
tmp = x + (((y - z) * t) / (a - z));
} else {
tmp = t_1;
}
return tmp;
}
def code(x, y, z, t, a): t_1 = x + (((y - z) / (a - z)) * t) tmp = 0 if t < -1.0682974490174067e-39: tmp = t_1 elif t < 3.9110949887586375e-141: tmp = x + (((y - z) * t) / (a - z)) else: tmp = t_1 return tmp
function code(x, y, z, t, a) t_1 = Float64(x + Float64(Float64(Float64(y - z) / Float64(a - z)) * t)) tmp = 0.0 if (t < -1.0682974490174067e-39) tmp = t_1; elseif (t < 3.9110949887586375e-141) tmp = Float64(x + Float64(Float64(Float64(y - z) * t) / Float64(a - z))); else tmp = t_1; end return tmp end
function tmp_2 = code(x, y, z, t, a) t_1 = x + (((y - z) / (a - z)) * t); tmp = 0.0; if (t < -1.0682974490174067e-39) tmp = t_1; elseif (t < 3.9110949887586375e-141) tmp = x + (((y - z) * t) / (a - z)); else tmp = t_1; end tmp_2 = tmp; end
code[x_, y_, z_, t_, a_] := Block[{t$95$1 = N[(x + N[(N[(N[(y - z), $MachinePrecision] / N[(a - z), $MachinePrecision]), $MachinePrecision] * t), $MachinePrecision]), $MachinePrecision]}, If[Less[t, -1.0682974490174067e-39], t$95$1, If[Less[t, 3.9110949887586375e-141], N[(x + N[(N[(N[(y - z), $MachinePrecision] * t), $MachinePrecision] / N[(a - z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision], t$95$1]]]
\begin{array}{l}
\\
\begin{array}{l}
t_1 := x + \frac{y - z}{a - z} \cdot t\\
\mathbf{if}\;t < -1.0682974490174067 \cdot 10^{-39}:\\
\;\;\;\;t\_1\\
\mathbf{elif}\;t < 3.9110949887586375 \cdot 10^{-141}:\\
\;\;\;\;x + \frac{\left(y - z\right) \cdot t}{a - z}\\
\mathbf{else}:\\
\;\;\;\;t\_1\\
\end{array}
\end{array}
herbie shell --seed 2024195
(FPCore (x y z t a)
:name "Graphics.Rendering.Plot.Render.Plot.Axis:renderAxisTick from plot-0.2.3.4, A"
:precision binary64
:alt
(! :herbie-platform default (if (< t -10682974490174067/10000000000000000000000000000000000000000000000000000000) (+ x (* (/ (- y z) (- a z)) t)) (if (< t 312887599100691/80000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000) (+ x (/ (* (- y z) t) (- a z))) (+ x (* (/ (- y z) (- a z)) t)))))
(+ x (/ (* (- y z) t) (- a z))))