https://bugs.llvm.org/show_bug.cgi?id=39488
Bug ID: 39488
Summary: Tune lsr for the wasm backend
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: WebAssembly
Assignee: unassignedb...@nondot.org
Reporter: alonza...@gmail.com
CC: llvm-bugs@lists.llvm.org
We've noticed (e.g. [1]) that lsr is often unhelpful in the wasm backend and
leads to slower and larger code. sunfish suggests the pass may need to be tuned
for wasm.
Some data:
* The most extreme example is fannkuch, 5x slower in v8, 2x slower in sm, and
the crucial fannkuch_worker method is 45% larger, attaching.
* Many other minor examples too, primes-nocheck is 33% slower in v8 and 7%
slower in sm, and the main() function is 7% bigger with lsr, also attaching.
* This also affects real-world code, e.g. lua and box2d are 1% bigger.
[1] https://github.com/kripken/emscripten/pull/7386
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
