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libbb/sha256: code shrink in 64-bit x86

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function                                             old     new   delta
sha256_process_block64_shaNI                         701     680     -21

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2022-02-09 01:42:49 +01:00
parent 461a994b09
commit 11bcea7ac0
1 changed files with 14 additions and 11 deletions
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25
libbb/hash_md5_sha256_x86-64_shaNI.S
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@ -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