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Comment about approach

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frankw
2016-06-24 23:42:10 +02:00
parent 07dd36a646
commit 100130f468
1 changed files with 27 additions and 0 deletions
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27
compress_amd64.s
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@@ -16,6 +16,33 @@
// limitations under the License.
//
//
// Based on SSE implementation from https://github.com/BLAKE2/BLAKE2/blob/master/sse/blake2b.c
//
// Use github.com/fwessels/asm2plan9s on this file to assemble instructions to their Plan9 equivalent
//
// Assembly code below essentially follows the ROUND macro (see blake2b-round.h) which is defined as:
// #define ROUND(r) \
// LOAD_MSG_ ##r ##_1(b0, b1); \
// G1(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
// LOAD_MSG_ ##r ##_2(b0, b1); \
// G2(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
// DIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h); \
// LOAD_MSG_ ##r ##_3(b0, b1); \
// G1(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
// LOAD_MSG_ ##r ##_4(b0, b1); \
// G2(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h,b0,b1); \
// UNDIAGONALIZE(row1l,row2l,row3l,row4l,row1h,row2h,row3h,row4h);
//
// as well as the go equivalent in https://github.com/dchest/blake2b/blob/master/block.go
//
// As in the macro, G1/G2 in the 1st and 2nd half are identical (so literal copy of assembly)
//
// Rounds are also the same, except for the loading of the message (and rounds 1 & 11 and
// rounds 2 & 12 are identical)
//
// func compressSSE(compressSSE(p []uint8, in, iv, t, f, shffle, out []uint64)
TEXT ·compressSSE(SB), 7, $0