eb52e7fa5
Denys Vlasenko
2022-02-08
Subject
libbb/sha1: shrink x86 hardware accelerated hashing (32-bit)
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libbb/hash_md5_sha_x86-32_shaNI.S+5 -6
| @@ -35,11 +35,9 @@ | |
| .balign 8 # allow decoders to fetch at least 2 first insns | |
| sha1_process_block64_shaNI: | |
| - | subl $16, %esp |
| - | |
| /* load initial hash values */ | |
| - | xor128 E0, E0 |
| movu128 76(%eax), ABCD | |
| + | xor128 E0, E0 |
| pinsrd $3, 76+4*4(%eax), E0 # load to uppermost 32-bit word | |
| shuf128_32 $0x1B, ABCD, ABCD # DCBA -> ABCD | |
| @@ -56,7 +54,7 @@ sha1_process_block64_shaNI: | |
| /* Save hash values for addition after rounds */ | |
| movu128 E0, %xmm7 | |
| - | movu128 ABCD, (%esp) |
| + | /*movu128 ABCD, %xmm8 - NOPE, 32bit has no xmm8 */ |
| /* Rounds 0-3 */ | |
| paddd MSG0, E0 | |
| @@ -208,7 +206,9 @@ sha1_process_block64_shaNI: | |
| /* Add current hash values with previously saved */ | |
| sha1nexte %xmm7, E0 | |
| - | movu128 (%esp), %xmm7 |
| + | /*paddd %xmm8, ABCD - 32-bit mode has no xmm8 */ |
| + | movu128 76(%eax), %xmm7 # recreate original ABCD |
| + | shuf128_32 $0x1B, %xmm7, %xmm7 # DCBA -> ABCD |
| paddd %xmm7, ABCD | |
| /* Write hash values back in the correct order */ | |
| @@ -216,7 +216,6 @@ sha1_process_block64_shaNI: | |
| movu128 ABCD, 76(%eax) | |
| extr128_32 $3, E0, 76+4*4(%eax) | |
| - | addl $16, %esp |
| ret | |
| .size sha1_process_block64_shaNI, .-sha1_process_block64_shaNI | |