diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
@@ -287,9 +287,9 @@
   } else if (Op.isImm()) {
     O << Op.getImm();
   } else if (Op.isSFPImm()) {
-    O << ::toString(APFloat(bit_cast<float>(Op.getSFPImm())));
+    O << ::toString(APFloat(APFloat::IEEEsingle(), APInt(32, Op.getSFPImm())));
   } else if (Op.isDFPImm()) {
-    O << ::toString(APFloat(bit_cast<double>(Op.getDFPImm())));
+    O << ::toString(APFloat(APFloat::IEEEdouble(), APInt(64, Op.getDFPImm())));
   } else {
     assert(Op.isExpr() && "unknown operand kind in printOperand");
     // call_indirect instructions have a TYPEINDEX operand that we print