https://llvm.org/bugs/show_bug.cgi?id=27361
Bug ID: 27361
Summary: TargetMachine is not thread safe (but it really should
be)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Target Description Classes
Assignee: unassignedb...@nondot.org
Reporter: dav...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When doing parallel CodeGen we currently have to create a TargetMachine
per-thread because TargetMachine is not thread-safe.
This is a waste, and it would be nice if it can be avoided.
Also, having an immutable TargetMachine is a preliminary step needed if we want
at some point parallelize the backend.
Eric pointed out the least amount of work needed:
* Handle resetTargetOptions first (at least)
* An optional lock on getSubtarget
The subtarget itself should be fine, and if not, it should be fixed.
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