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X-Hacker.org- iAPx86 - <b>idiv division, signed flags: o d i t s z a p c</b>
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IDIV Division, Signed Flags: O D I T S Z A P C
? - - - ? ? ? ? ?
IDIV source
Logic AL . AX / source
AH . remainder
or
AX . DX:AX / source
DX . remainder
or
EAX . EDX:EAX / source ; 386+
EDX . remainder
IDIV performs a signed division. The dividend, quotient, and
remainder are implicitly allocated to fixed registers, while only
the divisor is given as an explicit operand. The type of the
divisor determines which registers are used. Non-integral
quotients are truncated toward zero. The remainder has the same
sign as the dividend.
Size Dividend Divisor Quotient Remainder
byte AX r/m8 AL AH
word DX:AX r/m16 AX DX
dword EDX:EAX r/m32 EAX EDX ; 386+
Note
If the resulting quotient is too large to fit in the destination,
or if the divisor is zero, an interrupt 0 (divide by zero) is
generated. If a divide-by-zero occurs, the quotient and remainder
are undefined.
Opcode Format
F6 /7 IDIV r/m8
F7 /7 IDIV r/m16
F7 /7 IDIV r/m32
Length and timing
Operands Bytes 8088 186 286 386 486 Pentium
r8 2 101-112 44-52 17 19 19 22 NP
r16 2 165-184 53-61 25 27 27 30 NP
r32 2 - - - 43 43 46 NP
mem8 2+d(0-2) 107-118+EA 50-58 20 22 20 22 NP
mem16 2+d(0-2) 171-190+EA 59-67 28 30 28 30 NP
mem32 2+d(0-2) - - - 46 44 46 NP
See Also: DIV SAR SHRD AAD IMUL
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