c - double value returned gets corrupted by 'litofp()' (Joe B.)

The following line of c code produces incorrect machine code?: double tmp;static char buffer;tmp = getNVMExtractionRate();sprintf(buffer, "%6.1f\n\r", tmp); disassembly: !double getNVMExtractionRate() !{0x9D050FC4: LUI V0, -24575 0x9D050FC8: ADDIU V0, V..