On 6/22/14 8:52 PM, Patrick Walton wrote:
On 6/22/14 8:46 PM, Daniel Micay wrote:
It's for faster (but not free) array bounds checking. I don't think Rust
will be able to use it because it unwinds on out-of-bounds rather than
aborting, and it will be difficult to turn the OS support (perhaps
SIGFPE / SIGSEGV on *nix) into well defined unwinding in LLVM.
GCJ did it. Presumably JavaScriptCore does it too. How?
Also this doesn't seem that difficult to me. Replace
array-bounds-checked loads and stores with a
@llvm.load.with.bounds.check() (or whatever) intrinsic and have LLVM
consider that as unwindable.
Patrick
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