ref: 06e7a0c56dcaae14baf1e94e7e348c0ecbd310a4
dir: /sys/src/ape/lib/9/386/getfcr.s/
TEXT setfcr(SB), $0 MOVL p+0(FP),AX XORB $0x3f,AX PUSHW AX WAIT FLDCW 0(SP) POPW AX RET TEXT getfcr(SB), $0 PUSHW AX WAIT FSTCW 0(SP) POPW AX XORB $0x3f,AX RET TEXT getfsr(SB), $0 WAIT FSTSW AX RET TEXT setfsr(SB), $0 WAIT FCLEX RET