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lib/crypto: x86/sha256: Remove unnecessary checks for nblocks==0

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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>
This commit is contained in:
Eric Biggers 2025-07-03 19:39:58 -07:00
parent a8c60a9aca
commit 57b15e9260
4 changed files with 0 additions and 10 deletions
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3
lib/crypto/x86/sha256-avx-asm.S
View File

@ -357,7 +357,6 @@ SYM_FUNC_START(sha256_transform_avx)
and $~15, %rsp # align stack pointer
shl $6, NUM_BLKS # convert to bytes
jz .Ldone_hash
add INP, NUM_BLKS # pointer to end of data
mov NUM_BLKS, _INP_END(%rsp)
@ -446,8 +445,6 @@ SYM_FUNC_START(sha256_transform_avx)
cmp _INP_END(%rsp), INP
jne .Lloop0
.Ldone_hash:
mov %rbp, %rsp
popq %rbp
popq %r15

1
lib/crypto/x86/sha256-avx2-asm.S
View File

@ -535,7 +535,6 @@ SYM_FUNC_START(sha256_transform_rorx)
and $-32, %rsp # align rsp to 32 byte boundary
shl $6, NUM_BLKS # convert to bytes
jz .Ldone_hash
lea -64(INP, NUM_BLKS), NUM_BLKS # pointer to last block
mov NUM_BLKS, _INP_END(%rsp)

3
lib/crypto/x86/sha256-ni-asm.S
View File

@ -112,7 +112,6 @@
SYM_FUNC_START(sha256_ni_transform)
shl $6, NUM_BLKS /* convert to bytes */
jz .Ldone_hash
add DATA_PTR, NUM_BLKS /* pointer to end of data */
/*
@ -163,8 +162,6 @@ SYM_FUNC_START(sha256_ni_transform)
movdqu STATE1, 0*16(STATE_PTR)
movdqu STATE0, 1*16(STATE_PTR)
.Ldone_hash:
RET
SYM_FUNC_END(sha256_ni_transform)

3
lib/crypto/x86/sha256-ssse3-asm.S
View File

@ -364,7 +364,6 @@ SYM_FUNC_START(sha256_transform_ssse3)
and $~15, %rsp
shl $6, NUM_BLKS # convert to bytes
jz .Ldone_hash
add INP, NUM_BLKS
mov NUM_BLKS, _INP_END(%rsp) # pointer to end of data
@ -457,8 +456,6 @@ SYM_FUNC_START(sha256_transform_ssse3)
cmp _INP_END(%rsp), INP
jne .Lloop0
.Ldone_hash:
mov %rbp, %rsp
popq %rbp
popq %r15