\[\sqrt{re \cdot re + im \cdot im}\]
Test:
math.abs on complex
Bits:
128 bits
Bits error versus re
Bits error versus im
Time: 4.7 s
Input Error: 13.6
Output Error: 7.1
Log: ⚲
Profile: 🕒
\(\begin{cases} -re & \text{when } re \le -8.445584f+19 \\ \sqrt{{re}^2 + im \cdot im} & \text{when } re \le 1.0553463f+20 \\ re & \text{otherwise} \end{cases}\)

    if re < -8.445584f+19

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      27.5
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      27.5
    3. Applied taylor to get
      \[\sqrt{{re}^2 + im \cdot im} \leadsto -1 \cdot re\]
      0
    4. Taylor expanded around -inf to get
      \[\color{red}{-1 \cdot re} \leadsto \color{blue}{-1 \cdot re}\]
      0
    5. Applied simplify to get
      \[\color{red}{-1 \cdot re} \leadsto \color{blue}{-re}\]
      0

    if -8.445584f+19 < re < 1.0553463f+20

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      9.3
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      9.3

    if 1.0553463f+20 < re

    1. Started with
      \[\sqrt{re \cdot re + im \cdot im}\]
      27.5
    2. Applied simplify to get
      \[\color{red}{\sqrt{re \cdot re + im \cdot im}} \leadsto \color{blue}{\sqrt{{re}^2 + im \cdot im}}\]
      27.5
    3. Applied taylor to get
      \[\sqrt{{re}^2 + im \cdot im} \leadsto re\]
      0
    4. Taylor expanded around inf to get
      \[\color{red}{re} \leadsto \color{blue}{re}\]
      0
  1. Removed slow pow expressions

Original test:


(lambda ((re default) (im default))
  #:name "math.abs on complex"
  (sqrt (+ (* re re) (* im im))))