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group Stop and Arithmetic Operations

Index 1 is top of the stack. See PUSH.

Stack input

  1. b: size in byte - 1 of the integer to sign extend.
  2. x: integer value to sign extend.

Stack output

  1. y: integer result of the sign extend.

Examples

* Input Output * * Input Output
1 0 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF * 1 0 0x7F
2 0xFF * 2 0x7F

Reproduce in playground.

Error cases

The state changes done by the current context are reverted in those cases:

  • Not enough gas.
  • Not enough values on the stack.