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Update comments in VMAC

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This commit is contained in:
Jeffrey Walton 2020-07-09 12:16:55 -04:00
parent b9601396b7
commit 3bed6789e3
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GPG Key ID: B36AB348921B1838
1 changed files with 7 additions and 3 deletions
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10
vmac.cpp
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@ -207,10 +207,14 @@ void VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWo
__asm__ __volatile__
(
# if CRYPTOPP_BOOL_X86
// Save EBX for PIC
// Hack. Save EBX for PIC. Do NOT 'push EBX' here.
// GCC issues 'mov ESP+8, EBX' to load L1KeyLength.
// A push breaks the reference to L1KeyLength.
AS2( mov %%ebx, -20(%%esp))
# endif
AS2( mov %0, %%ebx) // L1KeyLength into EBX
// L1KeyLength into EBX.
// GCC generates 'mov ESP+8, EBX'.
AS2( mov %0, %%ebx)
INTEL_NOPREFIX
#else
#if defined(__INTEL_COMPILER)
@ -223,7 +227,7 @@ void VMAC_Base::VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWo
AS2( mov dl, [ecx+m_isFirstBlock])
#endif
AS2( mov eax, tagPart)
AS2( shl eax, 4)
AS2( shl eax, 4)
AS2( mov edi, nhK)
AS2( add edi, eax)
AS2( add eax, eax)