[cfe-commits] r109960 - in /cfe/trunk: lib/CodeGen/CGObjCMac.cpp test/CodeGenObjC/exceptions.m test/CodeGenObjC/synchronized.m

[John McCall]

On Jul 31, 2010, at 5:38 PM, Chris Lattner wrote:
> Inline assembly?  Yuck.  I thought that [llvm-]gcc just marked tons of locals as volatile?

It does, but then it ends up with all these horrible liveness problems it has to work around.
It's also done in a really intrusive way in the type-checker.

It looked like my only bet for avoiding that without intrusive changes to IR gen — i.e.
some way of saying "okay, these things are volatile even if the AST says they aren't" —
was to go back over the function at the end and mark every single load and store
as volatile.  I didn't really consider that acceptable.

John.