https://github.com/rokerhro/xrm

XOR, (Bit-)Rotate, Multiply
https://github.com/rokerhro/xrm

mathematical-functions nerd riddle

Last synced: 9 months ago
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XOR, (Bit-)Rotate, Multiply

• Host: GitHub
• URL: https://github.com/rokerhro/xrm
• Owner: RokerHRO
• License: mit
• Created: 2019-06-04T10:01:31.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2019-06-04T10:14:17.000Z (about 7 years ago)
• Last Synced: 2024-10-19T13:58:40.140Z (over 1 year ago)
• Topics: mathematical-functions, nerd, riddle
• Language: C++
• Size: 5.86 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# XOR, Rotate, Multiply

I'm looking for 6 parameters X1, X2, R1, R2, M1, M2 so that the nested function call is equivalent to addition:

```c++

// C++:

#include "xrm_template.cc"

XRM xrm1;

XRM xrm2;

ASSERT_TRUE( xrm1(xrm2(u)) == u+1 );  // for all u from 0 … 2⁶⁴-1

```