diff --git a/js/src/jit/mips32/CodeGenerator-mips32.cpp b/js/src/jit/mips32/CodeGenerator-mips32.cpp
index 7dcfcdbb123b..d693e7e1801d 100644
--- a/js/src/jit/mips32/CodeGenerator-mips32.cpp
+++ b/js/src/jit/mips32/CodeGenerator-mips32.cpp
@@ -590,6 +590,30 @@ CodeGeneratorMIPS::visitAsmSelectI64(LAsmSelectI64* lir)
     }
 }
 
+void
+CodeGeneratorMIPS::visitAsmReinterpretFromI64(LAsmReinterpretFromI64* lir)
+{
+    MOZ_ASSERT(lir->mir()->type() == MIRType::Double);
+    MOZ_ASSERT(lir->mir()->input()->type() == MIRType::Int64);
+    Register64 input = ToRegister64(lir->getInt64Operand(0));
+    FloatRegister output = ToFloatRegister(lir->output());
+
+    masm.moveToDoubleLo(input.low, output);
+    masm.moveToDoubleHi(input.high, output);
+}
+
+void
+CodeGeneratorMIPS::visitAsmReinterpretToI64(LAsmReinterpretToI64* lir)
+{
+    MOZ_ASSERT(lir->mir()->type() == MIRType::Int64);
+    MOZ_ASSERT(lir->mir()->input()->type() == MIRType::Double);
+    FloatRegister input = ToFloatRegister(lir->getOperand(0));
+    Register64 output = ToOutRegister64(lir);
+
+    masm.moveFromDoubleLo(input, output.low);
+    masm.moveFromDoubleHi(input, output.high);
+}
+
 void
 CodeGeneratorMIPS::visitExtendInt32ToInt64(LExtendInt32ToInt64* lir)
 {
diff --git a/js/src/jit/mips32/CodeGenerator-mips32.h b/js/src/jit/mips32/CodeGenerator-mips32.h
index 1ed9092725c2..1d67838d0df1 100644
--- a/js/src/jit/mips32/CodeGenerator-mips32.h
+++ b/js/src/jit/mips32/CodeGenerator-mips32.h
@@ -47,6 +47,8 @@ class CodeGeneratorMIPS : public CodeGeneratorMIPSShared
     void visitWasmLoadGlobalVarI64(LWasmLoadGlobalVarI64* ins);
     void visitWasmStoreGlobalVarI64(LWasmStoreGlobalVarI64* ins);
     void visitAsmSelectI64(LAsmSelectI64* lir);
+    void visitAsmReinterpretFromI64(LAsmReinterpretFromI64* lir);
+    void visitAsmReinterpretToI64(LAsmReinterpretToI64* lir);
     void visitExtendInt32ToInt64(LExtendInt32ToInt64* lir);
     void visitWrapInt64ToInt32(LWrapInt64ToInt32* lir);
     void visitClzI64(LClzI64* ins);