Commit 832eebcc authored by Niels Möller's avatar Niels Möller

Further micro optimizations.

Rev: nettle/x86/aes.m4:1.4
parent d7b85b91
dnl BYTEREG(reg) gives the 8-bit register corresponding to the given 32-bit register.
dnl LREG(reg) gives the 8-bit register corresponding to the given 32-bit register.
dnl Use in AES_SUBST_BYTE below, and is used by both the x86 and the x86_64 assembler.
define(<BYTEREG>,<ifelse(
define(<LREG>,<ifelse(
$1, %eax, %al,
$1, %ebx, %bl,
$1, %ecx, %cl,
$1, %edx, %dl,
dnl The rest are x86_64 only
$1, %esi, %sil,
$1, %edi, %dil,
$1, %ebp, %bpl,
$1, %esp, %spl,
$1, %r8d, %r8b,
$1, %r9d, %r9b,
$1, %r10d, %r10b,
$1, %r11d, %r11b,
$1, %r12d, %r12b,
$1, %r13d, %r13b,
$1, %r14d, %r14b,
$1, %r15d, %r15b)>)dnl
$1, %edx, %dl)>)dnl
define(<HREG>,<ifelse(
$1, %eax, %ah,
$1, %ebx, %bh,
$1, %ecx, %ch,
$1, %edx, %dh)>)dnl
dnl AES_LOAD(a, b, c, d, src, key)
dnl Loads the next block of data from src, and add the subkey pointed
......@@ -51,20 +44,18 @@ define(<AES_STORE>, <
movl $3,8($6)
movl $4,12($6)>)dnl
dnl AES_ROUND(table,a,b,c,d,out,tmp)
dnl AES_ROUND(table,a,b,c,d,out,ptr)
dnl Computes one word of the AES round. Leaves result in $6.
define(<AES_ROUND>, <
movzbl BYTEREG($2), $7
movl AES_TABLE0 ($1, $7,4),$6
movl $3, $7
shrl <$>8,$7
andl <$>0xff,$7
movzbl LREG($2), $7
movl AES_TABLE0 ($1, $7, 4),$6
movzbl HREG($3), $7
xorl AES_TABLE1 ($1, $7, 4),$6
movl $4,$7 C third one
movl $4,$7
shrl <$>16,$7
andl <$>0xff,$7
xorl AES_TABLE2 ($1, $7, 4),$6
movl $5,$7 C fourth one
movl $5,$7
shrl <$>24,$7
xorl AES_TABLE3 ($1, $7, 4),$6>)dnl
......@@ -74,8 +65,7 @@ dnl Note that we have to quote $ in constants.
define(<AES_FINAL_ROUND>, <
C FIXME: Perform substitution on least significant byte here,
C to save work later.
movl $1,$5
andl <$>0x000000ff,$5
movzbl LREG($1),$5
movl $2,$6
andl <$>0x0000ff00,$6
orl $6, $5
......@@ -86,24 +76,24 @@ define(<AES_FINAL_ROUND>, <
andl <$>0xff000000,$6
orl $6, $5>)dnl
dnl AES_SUBST_BYTE(A, B, C, D, table, tmp)
dnl AES_SUBST_BYTE(A, B, C, D, table, ptr)
dnl Substitutes the least significant byte of
dnl each of eax, ebx, ecx and edx, and also rotates
dnl the words one byte to the left.
dnl Uses that AES_SBOX == 0
define(<AES_SUBST_BYTE>, <
movzbl BYTEREG($1),$6
movb ($5, $6),BYTEREG($1)
movzbl LREG($1),$6
movb ($5, $6),LREG($1)
roll <$>8,$1
movzbl BYTEREG($2),$6
movb ($5, $6),BYTEREG($2)
movzbl LREG($2),$6
movb ($5, $6),LREG($2)
roll <$>8,$2
movzbl BYTEREG($3),$6
movb ($5, $6),BYTEREG($3)
movzbl LREG($3),$6
movb ($5, $6),LREG($3)
roll <$>8,$3
movzbl BYTEREG($4),$6
movb ($5, $6),BYTEREG($4)
movzbl LREG($4),$6
movb ($5, $6),LREG($4)
roll <$>8,$4>)dnl
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