https://bugs.llvm.org/show_bug.cgi?id=40996
Bug ID: 40996
Summary: [clang-cl] Implement /d2FH4 to emit compact Win64
xdata
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: r...@google.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
Visual C++ folks appear to have optimized x64 EH data (.xdata), as described
here:
https://devblogs.microsoft.com/cppblog/making-cpp-exception-handling-smaller-x64/
The new flag is available in VS 2019 preview 3. The new __CxxFrameHandler4
personality function uses more compact tables for smaller binary size. We
should follow suit at some point.
For users that don't use exceptions, I am curious about how they reduced the
size of the unwind opcodes, which are used for normal stack unwinding. That is
something that *everybody* uses, and reducing its size therefore useful to
everyone.
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