[wasm2js] Run LLVM nontrapping fptoint lowering when running for emscripten (#7116)

Lower away saturating fptoint operations when we know we are using
emscripten.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/wasm2js.h b/src/wasm2js.h
index f81908948..7ed089448 100644
--- a/src/wasm2js.h
+++ b/src/wasm2js.h
@@ -361,6 +361,9 @@ Ref Wasm2JSBuilder::processWasm(Module* wasm, Name funcName) {
   // First, do the lowering to a JS-friendly subset.
   {
     PassRunner runner(wasm, options);
+    if (flags.emscripten) {
+      runner.add("llvm-nontrapping-fptoint-lowering");
+    }
     // TODO: only legalize if necessary - emscripten would already do so, and
     //       likely other toolchains. but spec test suite needs that.
     runner.add("legalize-js-interface");