#define TEMP    R19
#define ZERO    V0
#define IN0     V1
#define IN1     V2
#define KEY     V3
#define RCON    V4
#define MASK    V5
#define TMP     V6
#define STAGE   V7
#define OUTPERM V8
#define OUTMASK V9
#define OUTHEAD V10
#define OUTTAIL V11

// For P9 instruction emulation
#define ESPERM  V21  // Endian swapping permute into BE
#define TMP2    V22  // Temporary for P8_STXVB16X/P8_STXVB16X