Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
lib/crypto: x86/sha256: Remove unnecessary checks for nblocks==0
Since sha256_blocks() is called only with nblocks >= 1, remove
unnecessary checks for nblocks == 0 from the x86 SHA-256 assembly code.
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250704023958.73274-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
-10
-3
lib/crypto/x86/sha256-avx-asm.S
-3
lib/crypto/x86/sha256-avx-asm.S
···
357
357
and $~15, %rsp # align stack pointer
358
358
359
359
shl $6, NUM_BLKS # convert to bytes
360
-
jz .Ldone_hash
361
360
add INP, NUM_BLKS # pointer to end of data
362
361
mov NUM_BLKS, _INP_END(%rsp)
363
362
···
444
445
add $64, INP
445
446
cmp _INP_END(%rsp), INP
446
447
jne .Lloop0
447
-
448
-
.Ldone_hash:
449
448
450
449
mov %rbp, %rsp
451
450
popq %rbp
-1
lib/crypto/x86/sha256-avx2-asm.S
-1
lib/crypto/x86/sha256-avx2-asm.S
-3
lib/crypto/x86/sha256-ni-asm.S
-3
lib/crypto/x86/sha256-ni-asm.S
···
112
112
SYM_FUNC_START(sha256_ni_transform)
113
113
114
114
shl $6, NUM_BLKS /* convert to bytes */
115
-
jz .Ldone_hash
116
115
add DATA_PTR, NUM_BLKS /* pointer to end of data */
117
116
118
117
/*
···
161
162
162
163
movdqu STATE1, 0*16(STATE_PTR)
163
164
movdqu STATE0, 1*16(STATE_PTR)
164
-
165
-
.Ldone_hash:
166
165
167
166
RET
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167
SYM_FUNC_END(sha256_ni_transform)
-3
lib/crypto/x86/sha256-ssse3-asm.S
-3
lib/crypto/x86/sha256-ssse3-asm.S
···
364
364
and $~15, %rsp
365
365
366
366
shl $6, NUM_BLKS # convert to bytes
367
-
jz .Ldone_hash
368
367
add INP, NUM_BLKS
369
368
mov NUM_BLKS, _INP_END(%rsp) # pointer to end of data
370
369
···
455
456
add $64, INP
456
457
cmp _INP_END(%rsp), INP
457
458
jne .Lloop0
458
-
459
-
.Ldone_hash:
460
459
461
460
mov %rbp, %rsp
462
461
popq %rbp