?

Average Error: 99.9% → 100.0%
Time: 10.3s
Precision: binary64
Cost: 6848.00

?

\[\left(\left(\left(56789 \leq a \land a \leq 98765\right) \land \left(0 \leq b \land b \leq 1\right)\right) \land \left(0 \leq c \land c \leq 0.0016773\right)\right) \land \left(0 \leq d \land d \leq 0.0016773\right)\]
\[a \cdot \left(\left(b + c\right) + d\right) \]
↓
\[\mathsf{fma}\left(b + c, a, a \cdot d\right) \]
(FPCore (a b c d) :precision binary64 (* a (+ (+ b c) d)))
↓
(FPCore (a b c d) :precision binary64 (fma (+ b c) a (* a d)))
double code(double a, double b, double c, double d) {
	return a * ((b + c) + d);
}
↓
double code(double a, double b, double c, double d) {
	return fma((b + c), a, (a * d));
}

function code(a, b, c, d)
	return Float64(a * Float64(Float64(b + c) + d))
end
↓
function code(a, b, c, d)
	return fma(Float64(b + c), a, Float64(a * d))
end

code[a_, b_, c_, d_] := N[(a * N[(N[(b + c), $MachinePrecision] + d), $MachinePrecision]), $MachinePrecision]
↓
code[a_, b_, c_, d_] := N[(N[(b + c), $MachinePrecision] * a + N[(a * d), $MachinePrecision]), $MachinePrecision]

a \cdot \left(\left(b + c\right) + d\right)
↓
\mathsf{fma}\left(b + c, a, a \cdot d\right)

Error?

Target

Original99.9%
Target99.9%
Herbie100.0%
\[a \cdot b + a \cdot \left(c + d\right) \]

Derivation?

  1. Initial program 99.9

    \[a \cdot \left(\left(b + c\right) + d\right) \]

  2. Applied egg-rr100.0

    \[\leadsto \color{blue}{\mathsf{fma}\left(b + c, a, a \cdot d\right)} \]

  3. Final simplification100.0

    \[\leadsto \mathsf{fma}\left(b + c, a, a \cdot d\right) \]

Alternatives

Alternative 1
Error52.4%
Cost588.00
\[\begin{array}{l} \mathbf{if}\;c \leq 6.8 \cdot 10^{-285}:\\ \;\;\;\;b \cdot a\\ \mathbf{elif}\;c \leq 3.6 \cdot 10^{-250}:\\ \;\;\;\;a \cdot d\\ \mathbf{elif}\;c \leq 1.6 \cdot 10^{-117}:\\ \;\;\;\;b \cdot a\\ \mathbf{else}:\\ \;\;\;\;c \cdot a\\ \end{array} \]
Alternative 2
Error99.9%
Cost576.00
\[a \cdot \left(b + d\right) + c \cdot a \]
Alternative 3
Error79.4%
Cost452.00
\[\begin{array}{l} \mathbf{if}\;d \leq 2.1 \cdot 10^{-88}:\\ \;\;\;\;\left(b + c\right) \cdot a\\ \mathbf{else}:\\ \;\;\;\;a \cdot d\\ \end{array} \]
Alternative 4
Error83.8%
Cost452.00
\[\begin{array}{l} \mathbf{if}\;d \leq 2.2 \cdot 10^{-102}:\\ \;\;\;\;\left(b + c\right) \cdot a\\ \mathbf{else}:\\ \;\;\;\;a \cdot \left(c + d\right)\\ \end{array} \]
Alternative 5
Error85.2%
Cost452.00
\[\begin{array}{l} \mathbf{if}\;c \leq 3 \cdot 10^{-140}:\\ \;\;\;\;a \cdot \left(b + d\right)\\ \mathbf{else}:\\ \;\;\;\;\left(b + c\right) \cdot a\\ \end{array} \]
Alternative 6
Error99.9%
Cost448.00
\[a \cdot \left(\left(b + c\right) + d\right) \]
Alternative 7
Error52.3%
Cost324.00
\[\begin{array}{l} \mathbf{if}\;c \leq 2.65 \cdot 10^{-117}:\\ \;\;\;\;b \cdot a\\ \mathbf{else}:\\ \;\;\;\;c \cdot a\\ \end{array} \]
Alternative 8
Error36.3%
Cost192.00
\[b \cdot a \]

Error

Reproduce?

herbie shell --seed 2023093 
(FPCore (a b c d)
  :name "Expression, p14"
  :precision binary64
  :pre (and (and (and (and (<= 56789.0 a) (<= a 98765.0)) (and (<= 0.0 b) (<= b 1.0))) (and (<= 0.0 c) (<= c 0.0016773))) (and (<= 0.0 d) (<= d 0.0016773)))

  :herbie-target
  (+ (* a b) (* a (+ c d)))

  (* a (+ (+ b c) d)))