search for: f2bf20bc

...se to add the general feature. I'd rather have a feature that does one thing well rather than trying to be overly general (e.g. llvm.lifetime.start). -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161212/f2bf20bc/attachment.html>

----- Original Message ----- > From: "Reid Kleckner via llvm-dev" <llvm-dev at lists.llvm.org> > To: "llvm-dev" <llvm-dev at lists.llvm.org> > Sent: Thursday, December 8, 2016 7:05:44 PM > Subject: [llvm-dev] RFC: Adding argument allocas > Clang is currently missing some low-hanging performance and code size > opportunities when receiving

Clang is currently missing some low-hanging performance and code size opportunities when receiving function parameters. For most scalar parameters, Clang typically emits an alloca and stores the LLVM SSA argument value into the alloca to initialize it. With optimizations, this initialization is often removed, but it stays behind in debug builds and when the user takes the address of a parameter (