11bcea7ac
Denys Vlasenko
2022-02-09
Subject
libbb/sha256: code shrink in 64-bit x86
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libbb/hash_md5_sha256_x86-64_shaNI.S+14 -11
| @@ -37,16 +37,18 @@ | |
| #define ABEF_SAVE %xmm9 | |
| #define CDGH_SAVE %xmm10 | |
| + | #define SHUF(a,b,c,d) $(a+(b<<2)+(c<<4)+(d<<6)) |
| + | |
| .balign 8 # allow decoders to fetch at least 2 first insns | |
| sha256_process_block64_shaNI: | |
| - | movu128 80+0*16(%rdi), STATE0 |
| - | movu128 80+1*16(%rdi), STATE1 |
| - | shuf128_32 $0xB1, STATE0, STATE0 /* CDAB */ |
| - | shuf128_32 $0x1B, STATE1, STATE1 /* EFGH */ |
| + | movu128 80+0*16(%rdi), STATE1 /* DCBA (msb-to-lsb: 3,2,1,0) */ |
| + | movu128 80+1*16(%rdi), STATE0 /* HGFE */ |
| + | /* shufps takes dwords 0,1 from *2nd* operand, and dwords 2,3 from 1st one */ |
| mova128 STATE0, XMMTMP | |
| - | palignr $8, STATE1, STATE0 /* ABEF */ |
| - | pblendw $0xF0, XMMTMP, STATE1 /* CDGH */ |
| + | shufps SHUF(1,0,1,0), STATE1, STATE0 /* ABEF */ |
| + | shufps SHUF(3,2,3,2), STATE1, XMMTMP /* CDGH */ |
| + | mova128 XMMTMP, STATE1 |
| /* XMMTMP holds flip mask from here... */ | |
| mova128 PSHUFFLE_BSWAP32_FLIP_MASK(%rip), XMMTMP | |
| @@ -242,14 +244,15 @@ sha256_process_block64_shaNI: | |
| paddd CDGH_SAVE, STATE1 | |
| /* Write hash values back in the correct order */ | |
| - | shuf128_32 $0x1B, STATE0, STATE0 /* FEBA */ |
| - | shuf128_32 $0xB1, STATE1, STATE1 /* DCHG */ |
| + | /* STATE0: ABEF (msb-to-lsb: 3,2,1,0) */ |
| + | /* STATE1: CDGH */ |
| mova128 STATE0, XMMTMP | |
| - | pblendw $0xF0, STATE1, STATE0 /* DCBA */ |
| - | palignr $8, XMMTMP, STATE1 /* HGFE */ |
| + | /* shufps takes dwords 0,1 from *2nd* operand, and dwords 2,3 from 1st one */ |
| + | shufps SHUF(3,2,3,2), STATE1, STATE0 /* DCBA */ |
| + | shufps SHUF(1,0,1,0), STATE1, XMMTMP /* HGFE */ |
| movu128 STATE0, 80+0*16(%rdi) | |
| - | movu128 STATE1, 80+1*16(%rdi) |
| + | movu128 XMMTMP, 80+1*16(%rdi) |
| ret | |
| .size sha256_process_block64_shaNI, .-sha256_process_block64_shaNI | |