Remove redundant fields from basicblock: b_nofallthrough, b_exit, b_return · Issue #93444 · python/cpython (original) (raw)

Skip to content

Navigation Menu

• • GitHub Copilot Write better code with AI
  • GitHub Advanced Security Find and fix vulnerabilities
  • Actions Automate any workflow
  • Codespaces Instant dev environments
  • Issues Plan and track work
  • Code Review Manage code changes
  • Discussions Collaborate outside of code
  • Code Search Find more, search less
• Explore
  • Learning Pathways
  • Events & Webinars
  • Ebooks & Whitepapers
  • Customer Stories
  • Partners
  • Executive Insights
• • GitHub Sponsors Fund open source developers
  • The ReadME Project GitHub community articles
• • Enterprise platform AI-powered developer platform
• Pricing

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Sign up

Appearance settings

Description

The fields b_nofallthrough, b_exit, b_return in the compiler's basicblock can be easily calculated form the opcode of the last instruction in the block, so we can remove them.

This change is in line with our general move to simplify the compiler front end by not making it calculate things that the backend can deduce. It increases safety because the cached values need to be kept correct through transformations/optimisations of the block, and this adds opportunities for bugs.