p256one<>+16(SB)/8, $0xffffffffffffffff DATA p256one<>+24(SB)/8, $0x00000000fffffffe GLOBL p256one<>(SB), RODATA, $32 // func p256IsZero() // Requires: CMOV TEXT p256IsZero(SB), NOSPLIT, $0 // AX contains a flag that is set if the input is zero. XORQ AX, AX MOVQ $0x00000001, R15 // Check whether [acc4..acc7] are all zero. MOVQ R10, R14 ORQ R11, R14 ORQ R12, R14 ORQ R13, R14 // Set the zero flag if so. (CMOV of a constant to a register doesn't // appear to be supported in Go. Thus t1 = 1.) CMOVQEQ R15, AX // XOR [acc4..acc7]...