On Tue, Aug 07, 2018 at 09:49:16PM +0200, Dimitry Andric via llvm-dev wrote: > This is a regression caused by https://reviews.llvm.org/rL323281: > > ------------------------------------------------------------------------ > r323281 | wmi | 2018-01-23 23:27:57 +0000 (Tue, 23 Jan 2018) | 12 lines > > Adjust MaxAtomicInlineWidth for i386/i486 targets. > > This is to fix the bug reported in > https://bugs.llvm.org/show_bug.cgi?id=34347#c6. > Currently, all MaxAtomicInlineWidth of x86-32 targets are set to 64. However, > i386 doesn't support any cmpxchg related instructions. i486 only supports > cmpxchg. > So in this patch MaxAtomicInlineWidth is reset as follows: > For i386, the MaxAtomicInlineWidth should be 0 because no cmpxchg is > supported. > For i486, the MaxAtomicInlineWidth should be 32 because it supports cmpxchg. > For others 32 bits x86 cpu, the MaxAtomicInlineWidth should be 64 because of > cmpxchg8b.
This seems to be somewhat undesirable. Does *anyone* care about real i386 support at this point? NetBSD certainly doesn't and I think we are already the odd man for a number of cases like this. Joerg _______________________________________________ lldb-dev mailing list lldb-dev@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
