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imul vs mul
x86 multiply
imul x86
x86 mov
x86 add
imul assembly example
x86 sub
x86 mul
29 Sep 2010 When imul is passed a 32 bit argument as in your case with EDX which effectively means EAX * EDX where both EAX and EDX are 32 bit registers. Since you are multiplying two 32 bit values it is possible that the answer will overflow 32 bits in which case the high 32 bits of the answer will be written to the
9 Nov 2015 The X86-64 instruction set is described in complete detail in the Intel-64 and IA-32 Architectures Software Developer Manuals, available freely online. . The IMUL instruction is a little unusual: it takes its argument, multiplies it by the contents of %rax, and then places the low 64 bits of the result in %rax and
14 Apr 2009 The sample code includes the Instruction module that supports a subset of x86-64 instruc- tions. The implementation of this imul instructions. %rbx yes miscellaneous register. %rcx fourth argument register. %rdx third argument register; also used in idiv and imul instructions. %rsp stack pointer. %rbp yes.
Opcode, Mnemonic, Description. F6 /5, IMUL r/m8, AX = AL * r/m byte. F7 /5, IMUL r/m16, DX:AX = AX * r/m word. F7 /5, IMUL r/m32, EDX:EAX = EAX * r/m doubleword. 0F AF /r, IMUL r16,r/m16, word register = word register * r/m word. 0F AF /r, IMUL r32,r/m32, doubleword register = doubleword register * r/m doubleword.
W + F7 /4 MUL r/m64 M Valid N.E. Unsigned multiply (RDX:RAX < RAX ? r/m64). NOTES: * In64-bitmode,r/m8cannotbeencodedtoaccessthefollowingbyteregistersifaREXprefixisused:AH,BH,CH,DH. Instruction Operand Encoding Op/En Operand 1 Operand 2 Operand 3 Operand 4 M ModRM:r/m (r) NA NA NA Description
Opcode Instruction Op/En 64-Bit Mode Compat/Leg Mode Description F6 /7 IDIV r/m8 M Valid Valid Signed divide AX by r/m 8, with result stored in: AL < Quotient, AH < Remainder. REX + F6 /7 IDIV r/m8* M Valid N.E. Signed divide AX by r/m 8, with result stored in AL < Quotient, AH < Remainder. F7 /7 IDIV r/m16 M
8-bit multiplications are stored in a 16-bit result; 16-bit multiplications are stored in a 32-bit result; 32-bit multiplications are stored in a 64-bit result. The original mul/imul instructions are from 16-bit x86 which had come long before the 32-bit x86 instruction set appeared, so they couldn't store the result to
and values instead of their 16-bit (ax, bx, etc.) counterparts. See also x86 assembly language for a quick tutorial for this processor family. The updated instruction set is also grouped according to architecture (i386, i486, i686) and more generally is referred to as x86 32 and x86 64 (also known as Tgg?AMD64).
x86 Assembly In the second case, the target is not EAX for backward compatibility with code written for older processors. imul arg. As mul , only signed. The imul instruction has the same format as mul , but also accepts two In the following example, source contains a 64-bit number which will be added to destination .
The idiv instruction divides the contents of the 64 bit integer EDX:EAX (constructed by viewing EDX as the most significant four bytes and EAX as the least significant four bytes) by the specified operand value. The quotient result of the division is stored into EAX, while the remainder is placed in
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