Not as far as I'm aware. POWER, x86(_64), even Itanium all just bump a stack pointer[1]. SPARC has a funky stack, but I don't know enough about it to say how ha

Not as far as I'm aware. POWER, x86(_64), even Itanium all just bump a stack pointer[1]. SPARC has a funky stack, but I don't know enough about it to say how hard VLAs would be. (It's a darn cool architecture though. I wish acquiring a modern SPARC processor wasn't ridiculously expensive.) The thing that makes VLAs hard to implement is that on some embedded and special purpose processors the stack is actually a physical, fixed-size location on the chip. I recall, but can't seem to find, some architecture that didn't use an explicit stack pointer. 1. Itanium has 2, but for purposes of VLAs it may as well have a conventional stack.