https://bugs.llvm.org/show_bug.cgi?id=36038
Bug ID: 36038
Summary: long double is suboptimal on WebAssembly
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: WebAssembly
Assignee: unassignedb...@nondot.org
Reporter: n...@realvnc.com
CC: llvm-bugs@lists.llvm.org
Wasm provides "long double" as an emulated 128-bit double, using the
compiler-rt library.
This is excessive precision for most applications, and a previous discussion
(which I can't find now...) in a GitHub thread indicated that several Wasm
contributors thought it would be better to simply provide 64-bit floats on
Wasm.
The argument was, "anyone who really needs 128-bit floats is writing rather
unusual software, and can use a library".
Using 128-bit long doubles is a long-term ABI commitment, which incurs overhead
in any application that uses snprintf or other such functions.
I don't believe this change is recorded elsewhere in Bugzilla.
(See PR35582 for another similar ABI change, int_fast16_t, and PR33337 for
changing size_t to long.)
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