DynamoRIO / DynamoRIO/dynamorio
Encoding does not use compact forms of xchg
Open
Component-IR
OpSys-x86
Priority-Low
- Dominant language
- C
- Stars
- 3.2k
- Forks
- 629
- Avg merge
- 2d 18h
- Merged PRs (30d)
- 30
Description
DR will encode `xchg %eax, %r8d` as 44 87 c0 and `xchg %ax, %r8w` as 66 41 87 c0 despite 41 90 and 66 41 90 being more compact encodings of the same thing.
Contributor guide
Research direction
No file or test is named in the issue. Trace DynamoRIO's xchg encoding path, compare its output with the byte sequences in the report, and verify that the compact 32-bit and 16-bit forms are selected for these operands.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100