🛤 Sign-extension operators

[binji]

This is a tracking issue for a post-MVP feature
It will be updated as the issue progresses.

Topic Sign-extension operators
Champion Ben Smith @binji
Status in progress
Phase standardize the feature
Linked issues
Linked repositories github.com/WebAssembly/sign-extension-ops

Details

This proposal adds five new integer instructions for sign-extending 8-bit, 16-bit, and 32-bit values.

• i32.extend8_s: extend a signed 8-bit integer to a 32-bit integer
• i32.extend16_s: extend a signed 16-bit integer to a 32-bit integer
• i64.extend8_s: extend a signed 8-bit integer to a 64-bit integer
• i64.extend16_s: extend a signed 16-bit integer to a 64-bit integer
• i64.extend32_s: extend a signed 32-bit integer to a 64-bit integer

[sunfishcode]

Closing as discussed in WebAssembly/design#1534. As of WebAssembly/meetings#561, the CG no longer uses tracking issues to track proposals. See the proposals repo README.md to track the status of proposals.