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2 Commits

Author SHA1 Message Date
Dan Gohman 580c102ab8 [WebAssembly] Fix fptoui lowering bounds 
To fully avoid trapping on wasm, fptoui needs a second check to ensure that
the operand isn't below the supported range.

llvm-svn: 319354
 2017-11-29 20:20:11 +00:00
Dan Gohman cdd48b8a6b [WebAssembly] Fix trapping behavior in fptosi/fptoui. 
This adds code to protect WebAssembly's `trunc_s` family of opcodes
from values outside their domain. Even though such conversions have
full undefined behavior in C/C++, LLVM IR's `fptosi` and `fptoui` do
not, and only return undef.

This also implements the proposed non-trapping float-to-int conversion
feature and uses that instead when available.

llvm-svn: 319128
 2017-11-28 01:13:40 +00:00