Average Error: 0.4 → 0.3
Time: 44.1s
Precision: 64
Internal Precision: 384
\[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
↓
\[\left(\left(c + d\right) + \left(b + e\right)\right) + a\]

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Bits error versus e

Target

Original0.4
Target0.2
Herbie0.3
\[\left(d + \left(c + \left(a + b\right)\right)\right) + e\]

Derivation

  1. Initial program 0.4

    \[\left(\left(\left(e + d\right) + c\right) + b\right) + a\]
  2. Using strategy rm

  3. Applied add-sqr-sqrt0.6

    \[\leadsto \left(\color{blue}{\sqrt{\left(e + d\right) + c} \cdot \sqrt{\left(e + d\right) + c}} + b\right) + a\]

  4. Taylor expanded around 0 0.6

    \[\leadsto \left(\sqrt{\left(e + d\right) + c} \cdot \sqrt{\color{blue}{c + \left(d + e\right)}} + b\right) + a\]

  5. Applied simplify0.3

    \[\leadsto \color{blue}{\left(\left(c + d\right) + \left(b + e\right)\right) + a}\]
  6. Removed slow pow expressions.

Runtime

Time bar (total: 44.1s)Debug log

herbie shell --seed '#(1567391828 2030694642 2833800258 828025724 3004380912 3532991858)' +o setup:early-exit
(FPCore (a b c d e)
  :name "Expression 1, p15"
  :pre (<= 1 a 2 b 4 c 8 d 16 e 32)

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

  (+ (+ (+ (+ e d) c) b) a))