ref: b4b4b6cd631e4627f8e581d20fc70d5d13f4de18
dir: /sys/src/libsec/amd64/chachablock.s/
#define ROTATE(n, v1, v2) \ MOVO v1, v2; \ PSLLL $(n), v1; \ PSRLL $(32-n), v2; \ POR v1, v2 TEXT _chachablock(SB), 0, $0 MOVOU 0(RARG), X0 MOVOU 16(RARG), X1 MOVOU 32(RARG), X2 MOVOU 48(RARG), X3 MOVL rounds+8(FP), CX SHRL $1, CX _loop: PADDL X1, X0 PXOR X0, X3 /* ROTATE(16, X3, X3) */ PSHUFLW $(1<<0 | 0<<2 | 3<<4 | 2<<6), X3, X3 PSHUFHW $(1<<0 | 0<<2 | 3<<4 | 2<<6), X3, X3 PADDL X3, X2 MOVO X1, X4 PXOR X2, X4 ROTATE(12, X4, X1) PADDL X1, X0 MOVO X0, X4 PXOR X3, X4 ROTATE(8, X4, X3) PADDL X3, X2 MOVO X1, X4 PXOR X2, X4 ROTATE(7, X4, X1) PSHUFL $(1<<0 | 2<<2 | 3<<4 | 0<<6), X1, X1 PSHUFL $(2<<0 | 3<<2 | 0<<4 | 1<<6), X2, X2 PSHUFL $(3<<0 | 0<<2 | 1<<4 | 2<<6), X3, X3 PADDL X1, X0 PXOR X0, X3 /* ROTATE(16, X3, X3) */ PSHUFLW $(1<<0 | 0<<2 | 3<<4 | 2<<6), X3, X3 PSHUFHW $(1<<0 | 0<<2 | 3<<4 | 2<<6), X3, X3 PADDL X3, X2 MOVO X1, X4 PXOR X2, X4 ROTATE(12, X4, X1) PADDL X1, X0 MOVO X0, X4 PXOR X3, X4 ROTATE(8, X4, X3) PADDL X3, X2 MOVO X1, X4 PXOR X2, X4 ROTATE(7, X4, X1) PSHUFL $(3<<0 | 0<<2 | 1<<4 | 2<<6), X1, X1 PSHUFL $(2<<0 | 3<<2 | 0<<4 | 1<<6), X2, X2 PSHUFL $(1<<0 | 2<<2 | 3<<4 | 0<<6), X3, X3 DECL CX JNE _loop MOVOU X0, 0(RARG) MOVOU X1, 16(RARG) MOVOU X2, 32(RARG) MOVOU X3, 48(RARG) RET