Beckmann Sample, normalization factor

Percentage Accurate: 97.8% → 98.5%

Time: 17.0s

Alternatives: 8

Speedup: 1.0×

Specification

\[\left(0 < cosTheta \land cosTheta < 0.9999\right) \land \left(-1 < c \land c < 1\right)\]

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+
   (+ 1.0 c)
   (*
    (* (/ 1.0 (sqrt PI)) (/ (sqrt (- (- 1.0 cosTheta) cosTheta)) cosTheta))
    (exp (* (- cosTheta) cosTheta))))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + (((1.0f / sqrtf(((float) M_PI))) * (sqrtf(((1.0f - cosTheta) - cosTheta)) / cosTheta)) * expf((-cosTheta * cosTheta))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(1.0) / sqrt(Float32(pi))) * Float32(sqrt(Float32(Float32(Float32(1.0) - cosTheta) - cosTheta)) / cosTheta)) * exp(Float32(Float32(-cosTheta) * cosTheta)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + (((single(1.0) / sqrt(single(pi))) * (sqrt(((single(1.0) - cosTheta) - cosTheta)) / cosTheta)) * exp((-cosTheta * cosTheta))));
end

Initial Program: 97.8% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+
   (+ 1.0 c)
   (*
    (* (/ 1.0 (sqrt PI)) (/ (sqrt (- (- 1.0 cosTheta) cosTheta)) cosTheta))
    (exp (* (- cosTheta) cosTheta))))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + (((1.0f / sqrtf(((float) M_PI))) * (sqrtf(((1.0f - cosTheta) - cosTheta)) / cosTheta)) * expf((-cosTheta * cosTheta))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(1.0) / sqrt(Float32(pi))) * Float32(sqrt(Float32(Float32(Float32(1.0) - cosTheta) - cosTheta)) / cosTheta)) * exp(Float32(Float32(-cosTheta) * cosTheta)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + (((single(1.0) / sqrt(single(pi))) * (sqrt(((single(1.0) - cosTheta) - cosTheta)) / cosTheta)) * exp((-cosTheta * cosTheta))));
end

Alternative 1: 98.5% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}} \cdot e^{cosTheta \cdot \left(-cosTheta\right)}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+
   (+ 1.0 c)
   (*
    (/ (sqrt (- 1.0 (+ cosTheta cosTheta))) (* cosTheta (sqrt PI)))
    (exp (* cosTheta (- cosTheta)))))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + ((sqrtf((1.0f - (cosTheta + cosTheta))) / (cosTheta * sqrtf(((float) M_PI)))) * expf((cosTheta * -cosTheta))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(sqrt(Float32(Float32(1.0) - Float32(cosTheta + cosTheta))) / Float32(cosTheta * sqrt(Float32(pi)))) * exp(Float32(cosTheta * Float32(-cosTheta))))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + ((sqrt((single(1.0) - (cosTheta + cosTheta))) / (cosTheta * sqrt(single(pi)))) * exp((cosTheta * -cosTheta))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. frac-times 98.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\frac{1 \cdot \sqrt{\left(1 - cosTheta\right) - cosTheta}}{\sqrt{\pi} \cdot cosTheta}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   2. *-un-lft-identity 98.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\color{blue}{\sqrt{\left(1 - cosTheta\right) - cosTheta}}}{\sqrt{\pi} \cdot cosTheta} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   3. associate--l- 98.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\sqrt{\color{blue}{1 - \left(cosTheta + cosTheta\right)}}}{\sqrt{\pi} \cdot cosTheta} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   4. *-commutative 98.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{\color{blue}{cosTheta \cdot \sqrt{\pi}}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

4. Applied egg-rr 98.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

5. Final simplification 98.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}} \cdot e^{cosTheta \cdot \left(-cosTheta\right)}} \]
6. Add Preprocessing

Alternative 2: 97.9% accurate, 1.0× speedup

Math

\[\begin{array}{l} \\ \frac{1}{1 + \left(c + \frac{e^{-{cosTheta}^{2}}}{cosTheta} \cdot \sqrt{\frac{1 + cosTheta \cdot -2}{\pi}}\right)} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+
   1.0
   (+
    c
    (*
     (/ (exp (- (pow cosTheta 2.0))) cosTheta)
     (sqrt (/ (+ 1.0 (* cosTheta -2.0)) PI)))))))

C

float code(float cosTheta, float c) {
	return 1.0f / (1.0f + (c + ((expf(-powf(cosTheta, 2.0f)) / cosTheta) * sqrtf(((1.0f + (cosTheta * -2.0f)) / ((float) M_PI))))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(1.0) + Float32(c + Float32(Float32(exp(Float32(-(cosTheta ^ Float32(2.0)))) / cosTheta) * sqrt(Float32(Float32(Float32(1.0) + Float32(cosTheta * Float32(-2.0))) / Float32(pi)))))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / (single(1.0) + (c + ((exp(-(cosTheta ^ single(2.0))) / cosTheta) * sqrt(((single(1.0) + (cosTheta * single(-2.0))) / single(pi))))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Step-by-step derivation

   1. associate-+l+ 97.8%

      \[\leadsto \frac{1}{\color{blue}{1 + \left(c + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}\right)}} \]

   2. +-commutative 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\left(\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + c\right)}} \]

   3. *-commutative 97.8%

      \[\leadsto \frac{1}{1 + \left(\color{blue}{\left(\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta} \cdot \frac{1}{\sqrt{\pi}}\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + c\right)} \]

   4. associate-*l* 97.8%

      \[\leadsto \frac{1}{1 + \left(\color{blue}{\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta} \cdot \left(\frac{1}{\sqrt{\pi}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}\right)} + c\right)} \]

   5. fma-define 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\mathsf{fma}\left(\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}, \frac{1}{\sqrt{\pi}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}, c\right)}} \]

3. Simplified 97.8%

   \[\leadsto \color{blue}{\frac{1}{1 + \mathsf{fma}\left(\frac{\sqrt{\mathsf{fma}\left(cosTheta, -2, 1\right)}}{cosTheta}, \frac{e^{-cosTheta \cdot cosTheta}}{\sqrt{\pi}}, c\right)}} \]
4. Add Preprocessing

5. Taylor expanded in c around 0 97.9%

   \[\leadsto \frac{1}{1 + \color{blue}{\left(c + \frac{e^{-{cosTheta}^{2}}}{cosTheta} \cdot \sqrt{\frac{1 + -2 \cdot cosTheta}{\pi}}\right)}} \]

6. Final simplification 97.9%

   \[\leadsto \frac{1}{1 + \left(c + \frac{e^{-{cosTheta}^{2}}}{cosTheta} \cdot \sqrt{\frac{1 + cosTheta \cdot -2}{\pi}}\right)} \]
7. Add Preprocessing

Alternative 3: 97.5% accurate, 1.5× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \frac{\left(cosTheta \cdot -1.5 + \left({cosTheta}^{2} \cdot 0.5 + \frac{1}{cosTheta}\right)\right) + -1}{\sqrt{\pi}}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+
   (+ 1.0 c)
   (/
    (+
     (+ (* cosTheta -1.5) (+ (* (pow cosTheta 2.0) 0.5) (/ 1.0 cosTheta)))
     -1.0)
    (sqrt PI)))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + ((((cosTheta * -1.5f) + ((powf(cosTheta, 2.0f) * 0.5f) + (1.0f / cosTheta))) + -1.0f) / sqrtf(((float) M_PI))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(cosTheta * Float32(-1.5)) + Float32(Float32((cosTheta ^ Float32(2.0)) * Float32(0.5)) + Float32(Float32(1.0) / cosTheta))) + Float32(-1.0)) / sqrt(Float32(pi)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + ((((cosTheta * single(-1.5)) + (((cosTheta ^ single(2.0)) * single(0.5)) + (single(1.0) / cosTheta))) + single(-1.0)) / sqrt(single(pi))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. expm1-log1p-u 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   2. frac-times 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\color{blue}{\frac{1 \cdot \sqrt{\left(1 - cosTheta\right) - cosTheta}}{\sqrt{\pi} \cdot cosTheta}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   3. *-un-lft-identity 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\color{blue}{\sqrt{\left(1 - cosTheta\right) - cosTheta}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   4. associate--l- 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{\color{blue}{1 - \left(cosTheta + cosTheta\right)}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   5. *-commutative 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{\color{blue}{cosTheta \cdot \sqrt{\pi}}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

4. Applied egg-rr 90.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
5. Step-by-step derivation

   1. *-un-lft-identity 90.4%

      \[\leadsto \color{blue}{1 \cdot \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}}} \]

   2. +-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + \left(1 + c\right)}} \]

   3. *-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{e^{\left(-cosTheta\right) \cdot cosTheta} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} + \left(1 + c\right)} \]

   4. distribute-lft-neg-out 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{\color{blue}{-cosTheta \cdot cosTheta}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   5. unpow2 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{-\color{blue}{{cosTheta}^{2}}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   6. fma-define 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right), 1 + c\right)}} \]

6. Applied egg-rr 98.4%

   \[\leadsto \color{blue}{1 \cdot \frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]
7. Step-by-step derivation

   1. *-lft-identity 98.4%

      \[\leadsto \color{blue}{\frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]

   2. fma-undefine 98.4%

      \[\leadsto \frac{1}{\color{blue}{e^{-{cosTheta}^{2}} \cdot \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}} + \left(1 + c\right)}} \]

8. Simplified 98.3%

   \[\leadsto \color{blue}{\frac{1}{\frac{\frac{\frac{\sqrt{1 + cosTheta \cdot -2}}{e^{{cosTheta}^{2}}}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)}} \]

9. Taylor expanded in cosTheta around 0 97.7%

   \[\leadsto \frac{1}{\frac{\color{blue}{\left(-1.5 \cdot cosTheta + \left(0.5 \cdot {cosTheta}^{2} + \frac{1}{cosTheta}\right)\right) - 1}}{\sqrt{\pi}} + \left(1 + c\right)} \]

10. Final simplification 97.7%

    \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\left(cosTheta \cdot -1.5 + \left({cosTheta}^{2} \cdot 0.5 + \frac{1}{cosTheta}\right)\right) + -1}{\sqrt{\pi}}} \]
11. Add Preprocessing

Alternative 4: 97.0% accurate, 2.8× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \frac{\left(cosTheta \cdot -1.5 + \frac{1}{cosTheta}\right) + -1}{\sqrt{\pi}}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/
  1.0
  (+ (+ 1.0 c) (/ (+ (+ (* cosTheta -1.5) (/ 1.0 cosTheta)) -1.0) (sqrt PI)))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + ((((cosTheta * -1.5f) + (1.0f / cosTheta)) + -1.0f) / sqrtf(((float) M_PI))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(cosTheta * Float32(-1.5)) + Float32(Float32(1.0) / cosTheta)) + Float32(-1.0)) / sqrt(Float32(pi)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + ((((cosTheta * single(-1.5)) + (single(1.0) / cosTheta)) + single(-1.0)) / sqrt(single(pi))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. expm1-log1p-u 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   2. frac-times 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\color{blue}{\frac{1 \cdot \sqrt{\left(1 - cosTheta\right) - cosTheta}}{\sqrt{\pi} \cdot cosTheta}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   3. *-un-lft-identity 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\color{blue}{\sqrt{\left(1 - cosTheta\right) - cosTheta}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   4. associate--l- 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{\color{blue}{1 - \left(cosTheta + cosTheta\right)}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   5. *-commutative 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{\color{blue}{cosTheta \cdot \sqrt{\pi}}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

4. Applied egg-rr 90.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
5. Step-by-step derivation

   1. *-un-lft-identity 90.4%

      \[\leadsto \color{blue}{1 \cdot \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}}} \]

   2. +-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + \left(1 + c\right)}} \]

   3. *-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{e^{\left(-cosTheta\right) \cdot cosTheta} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} + \left(1 + c\right)} \]

   4. distribute-lft-neg-out 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{\color{blue}{-cosTheta \cdot cosTheta}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   5. unpow2 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{-\color{blue}{{cosTheta}^{2}}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   6. fma-define 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right), 1 + c\right)}} \]

6. Applied egg-rr 98.4%

   \[\leadsto \color{blue}{1 \cdot \frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]
7. Step-by-step derivation

   1. *-lft-identity 98.4%

      \[\leadsto \color{blue}{\frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]

   2. fma-undefine 98.4%

      \[\leadsto \frac{1}{\color{blue}{e^{-{cosTheta}^{2}} \cdot \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}} + \left(1 + c\right)}} \]

8. Simplified 98.3%

   \[\leadsto \color{blue}{\frac{1}{\frac{\frac{\frac{\sqrt{1 + cosTheta \cdot -2}}{e^{{cosTheta}^{2}}}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)}} \]

9. Taylor expanded in cosTheta around 0 97.1%

   \[\leadsto \frac{1}{\frac{\color{blue}{\left(-1.5 \cdot cosTheta + \frac{1}{cosTheta}\right) - 1}}{\sqrt{\pi}} + \left(1 + c\right)} \]

10. Final simplification 97.1%

    \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\left(cosTheta \cdot -1.5 + \frac{1}{cosTheta}\right) + -1}{\sqrt{\pi}}} \]
11. Add Preprocessing

Alternative 5: 95.7% accurate, 2.8× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \frac{\frac{1}{cosTheta} + -1}{\sqrt{\pi}}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/ 1.0 (+ (+ 1.0 c) (/ (+ (/ 1.0 cosTheta) -1.0) (sqrt PI)))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + (((1.0f / cosTheta) + -1.0f) / sqrtf(((float) M_PI))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(1.0) / cosTheta) + Float32(-1.0)) / sqrt(Float32(pi)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + (((single(1.0) / cosTheta) + single(-1.0)) / sqrt(single(pi))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. expm1-log1p-u 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   2. frac-times 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\color{blue}{\frac{1 \cdot \sqrt{\left(1 - cosTheta\right) - cosTheta}}{\sqrt{\pi} \cdot cosTheta}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   3. *-un-lft-identity 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\color{blue}{\sqrt{\left(1 - cosTheta\right) - cosTheta}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   4. associate--l- 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{\color{blue}{1 - \left(cosTheta + cosTheta\right)}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   5. *-commutative 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{\color{blue}{cosTheta \cdot \sqrt{\pi}}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

4. Applied egg-rr 90.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
5. Step-by-step derivation

   1. *-un-lft-identity 90.4%

      \[\leadsto \color{blue}{1 \cdot \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}}} \]

   2. +-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + \left(1 + c\right)}} \]

   3. *-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{e^{\left(-cosTheta\right) \cdot cosTheta} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} + \left(1 + c\right)} \]

   4. distribute-lft-neg-out 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{\color{blue}{-cosTheta \cdot cosTheta}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   5. unpow2 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{-\color{blue}{{cosTheta}^{2}}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   6. fma-define 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right), 1 + c\right)}} \]

6. Applied egg-rr 98.4%

   \[\leadsto \color{blue}{1 \cdot \frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]
7. Step-by-step derivation

   1. *-lft-identity 98.4%

      \[\leadsto \color{blue}{\frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]

   2. fma-undefine 98.4%

      \[\leadsto \frac{1}{\color{blue}{e^{-{cosTheta}^{2}} \cdot \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}} + \left(1 + c\right)}} \]

8. Simplified 98.3%

   \[\leadsto \color{blue}{\frac{1}{\frac{\frac{\frac{\sqrt{1 + cosTheta \cdot -2}}{e^{{cosTheta}^{2}}}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)}} \]

9. Taylor expanded in cosTheta around 0 95.4%

   \[\leadsto \frac{1}{\frac{\color{blue}{\frac{1}{cosTheta} - 1}}{\sqrt{\pi}} + \left(1 + c\right)} \]

10. Final simplification 95.4%

    \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\frac{1}{cosTheta} + -1}{\sqrt{\pi}}} \]
11. Add Preprocessing

Alternative 6: 95.7% accurate, 2.8× speedup

Math

\[\begin{array}{l} \\ \frac{1}{\left(1 + c\right) + \frac{\frac{1 - cosTheta}{cosTheta}}{\sqrt{\pi}}} \end{array} \]

FPCore

(FPCore (cosTheta c)
 :precision binary32
 (/ 1.0 (+ (+ 1.0 c) (/ (/ (- 1.0 cosTheta) cosTheta) (sqrt PI)))))

C

float code(float cosTheta, float c) {
	return 1.0f / ((1.0f + c) + (((1.0f - cosTheta) / cosTheta) / sqrtf(((float) M_PI))));
}

Julia

function code(cosTheta, c)
	return Float32(Float32(1.0) / Float32(Float32(Float32(1.0) + c) + Float32(Float32(Float32(Float32(1.0) - cosTheta) / cosTheta) / sqrt(Float32(pi)))))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0) / ((single(1.0) + c) + (((single(1.0) - cosTheta) / cosTheta) / sqrt(single(pi))));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Add Preprocessing
3. Step-by-step derivation

   1. expm1-log1p-u 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   2. frac-times 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\color{blue}{\frac{1 \cdot \sqrt{\left(1 - cosTheta\right) - cosTheta}}{\sqrt{\pi} \cdot cosTheta}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   3. *-un-lft-identity 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\color{blue}{\sqrt{\left(1 - cosTheta\right) - cosTheta}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   4. associate--l- 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{\color{blue}{1 - \left(cosTheta + cosTheta\right)}}}{\sqrt{\pi} \cdot cosTheta}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

   5. *-commutative 90.4%

      \[\leadsto \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{\color{blue}{cosTheta \cdot \sqrt{\pi}}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]

4. Applied egg-rr 90.4%

   \[\leadsto \frac{1}{\left(1 + c\right) + \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
5. Step-by-step derivation

   1. *-un-lft-identity 90.4%

      \[\leadsto \color{blue}{1 \cdot \frac{1}{\left(1 + c\right) + \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}}} \]

   2. +-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + \left(1 + c\right)}} \]

   3. *-commutative 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{e^{\left(-cosTheta\right) \cdot cosTheta} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right)} + \left(1 + c\right)} \]

   4. distribute-lft-neg-out 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{\color{blue}{-cosTheta \cdot cosTheta}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   5. unpow2 90.4%

      \[\leadsto 1 \cdot \frac{1}{e^{-\color{blue}{{cosTheta}^{2}}} \cdot \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right) + \left(1 + c\right)} \]

   6. fma-define 90.4%

      \[\leadsto 1 \cdot \frac{1}{\color{blue}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \mathsf{expm1}\left(\mathsf{log1p}\left(\frac{\sqrt{1 - \left(cosTheta + cosTheta\right)}}{cosTheta \cdot \sqrt{\pi}}\right)\right), 1 + c\right)}} \]

6. Applied egg-rr 98.4%

   \[\leadsto \color{blue}{1 \cdot \frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]
7. Step-by-step derivation

   1. *-lft-identity 98.4%

      \[\leadsto \color{blue}{\frac{1}{\mathsf{fma}\left(e^{-{cosTheta}^{2}}, \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}}, 1 + c\right)}} \]

   2. fma-undefine 98.4%

      \[\leadsto \frac{1}{\color{blue}{e^{-{cosTheta}^{2}} \cdot \frac{\sqrt{1 - 2 \cdot cosTheta}}{cosTheta \cdot \sqrt{\pi}} + \left(1 + c\right)}} \]

8. Simplified 98.3%

   \[\leadsto \color{blue}{\frac{1}{\frac{\frac{\frac{\sqrt{1 + cosTheta \cdot -2}}{e^{{cosTheta}^{2}}}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)}} \]

9. Taylor expanded in cosTheta around 0 95.4%

   \[\leadsto \frac{1}{\frac{\frac{\color{blue}{1 + -1 \cdot cosTheta}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)} \]
10. Step-by-step derivation

    1. neg-mul-1 95.4%

       \[\leadsto \frac{1}{\frac{\frac{1 + \color{blue}{\left(-cosTheta\right)}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)} \]

    2. unsub-neg 95.4%

       \[\leadsto \frac{1}{\frac{\frac{\color{blue}{1 - cosTheta}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)} \]

11. Simplified 95.4%

    \[\leadsto \frac{1}{\frac{\frac{\color{blue}{1 - cosTheta}}{cosTheta}}{\sqrt{\pi}} + \left(1 + c\right)} \]

12. Final simplification 95.4%

    \[\leadsto \frac{1}{\left(1 + c\right) + \frac{\frac{1 - cosTheta}{cosTheta}}{\sqrt{\pi}}} \]
13. Add Preprocessing

Alternative 7: 93.2% accurate, 3.1× speedup

Math

\[\begin{array}{l} \\ cosTheta \cdot \sqrt{\pi} \end{array} \]

FPCore

(FPCore (cosTheta c) :precision binary32 (* cosTheta (sqrt PI)))

C

float code(float cosTheta, float c) {
	return cosTheta * sqrtf(((float) M_PI));
}

Julia

function code(cosTheta, c)
	return Float32(cosTheta * sqrt(Float32(pi)))
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = cosTheta * sqrt(single(pi));
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Step-by-step derivation

   1. associate-+l+ 97.8%

      \[\leadsto \frac{1}{\color{blue}{1 + \left(c + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}\right)}} \]

   2. +-commutative 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\left(\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + c\right)}} \]

   3. fma-define 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\mathsf{fma}\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}, e^{\left(-cosTheta\right) \cdot cosTheta}, c\right)}} \]

3. Simplified 98.4%

   \[\leadsto \color{blue}{\frac{1}{1 + \mathsf{fma}\left(\frac{\sqrt{1 + cosTheta \cdot -2}}{cosTheta \cdot \sqrt{\pi}}, {\left(e^{-cosTheta}\right)}^{cosTheta}, c\right)}} \]
4. Add Preprocessing

5. Taylor expanded in cosTheta around 0 92.5%

   \[\leadsto \color{blue}{cosTheta \cdot \sqrt{\pi}} \]

6. Final simplification 92.5%

   \[\leadsto cosTheta \cdot \sqrt{\pi} \]
7. Add Preprocessing

Alternative 8: 10.7% accurate, 322.0× speedup

Math

\[\begin{array}{l} \\ 1 \end{array} \]

FPCore

(FPCore (cosTheta c) :precision binary32 1.0)

C

float code(float cosTheta, float c) {
	return 1.0f;
}

Fortran

real(4) function code(costheta, c)
    real(4), intent (in) :: costheta
    real(4), intent (in) :: c
    code = 1.0e0
end function

Julia

function code(cosTheta, c)
	return Float32(1.0)
end

MATLAB

function tmp = code(cosTheta, c)
	tmp = single(1.0);
end

Derivation

1. Initial program 97.8%

   \[\frac{1}{\left(1 + c\right) + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}} \]
2. Step-by-step derivation

   1. associate-+l+ 97.8%

      \[\leadsto \frac{1}{\color{blue}{1 + \left(c + \left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta}\right)}} \]

   2. +-commutative 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\left(\left(\frac{1}{\sqrt{\pi}} \cdot \frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}\right) \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + c\right)}} \]

   3. *-commutative 97.8%

      \[\leadsto \frac{1}{1 + \left(\color{blue}{\left(\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta} \cdot \frac{1}{\sqrt{\pi}}\right)} \cdot e^{\left(-cosTheta\right) \cdot cosTheta} + c\right)} \]

   4. associate-*l* 97.8%

      \[\leadsto \frac{1}{1 + \left(\color{blue}{\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta} \cdot \left(\frac{1}{\sqrt{\pi}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}\right)} + c\right)} \]

   5. fma-define 97.8%

      \[\leadsto \frac{1}{1 + \color{blue}{\mathsf{fma}\left(\frac{\sqrt{\left(1 - cosTheta\right) - cosTheta}}{cosTheta}, \frac{1}{\sqrt{\pi}} \cdot e^{\left(-cosTheta\right) \cdot cosTheta}, c\right)}} \]

3. Simplified 97.8%

   \[\leadsto \color{blue}{\frac{1}{1 + \mathsf{fma}\left(\frac{\sqrt{\mathsf{fma}\left(cosTheta, -2, 1\right)}}{cosTheta}, \frac{e^{-cosTheta \cdot cosTheta}}{\sqrt{\pi}}, c\right)}} \]
4. Add Preprocessing

5. Taylor expanded in c around inf 10.6%

   \[\leadsto \frac{1}{1 + \color{blue}{c}} \]

6. Taylor expanded in c around 0 10.6%

   \[\leadsto \color{blue}{1} \]

7. Final simplification 10.6%

   \[\leadsto 1 \]
8. Add Preprocessing

Reproduce

herbie shell --seed 2024062 
(FPCore (cosTheta c)
  :name "Beckmann Sample, normalization factor"
  :precision binary32
  :pre (and (and (< 0.0 cosTheta) (< cosTheta 0.9999)) (and (< -1.0 c) (< c 1.0)))
  (/ 1.0 (+ (+ 1.0 c) (* (* (/ 1.0 (sqrt PI)) (/ (sqrt (- (- 1.0 cosTheta) cosTheta)) cosTheta)) (exp (* (- cosTheta) cosTheta))))))