Imul source is a signed
Witryna19 lis 2024 · Component-wise multiply of 32-bit operands src0 and src1 (both are signed), producing the correct full 64-bit (per component) result. The low 32 bits (per … WitrynaThe following fragment computes 8-bit signed multiplication (48 × 4): mov al, 48 mov bl, 4 imul bl ; AX = 00C0h (decimal +192), OF = 1 Because AH is not a sign extension …
Imul source is a signed
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WitrynaThese 32x32 => 32-bit forms of imul work correctly for signed or unsigned; the results of one-operand mul and imul only differ in the upper half (in EDX ), not the low-half EAX output. See Intel's instruction reference manual entry for imul. Share Improve this answer Follow edited Jun 30, 2024 at 16:03 Peter Cordes 317k 45 583 818 WitrynaThe IMUL instruction is used for signed multiplication Preserves the sign of the product by sign-extending it. 2 One-Operand formats, as in MUL ... The ADC instruction adds both a source operand and the Carry flag to a destination operand. 8 (7.5.4 p2) Describe the SBB instruction.
WitrynaThe CF and OF flags are set when the signed integer value of the intermediate product differs from the sign extended operand-size-truncated product, otherwise the CF and OF flags are cleared. The three forms of the IMUL instruction are similar in that the length of the product is calculated to twice the length of the operands. Witryna14 sie 2014 · Signed vs. Unsigned Multiplication • Thus there is one instruction to multiply signed (IMUL)and another instruction to multiply unsigned (MUL). • These instructions execute one way if you're working with bytes and they execute in a different way if you're working with words.
WitrynaIMUL Signed Multiply * If the first two operands are the same, the second one can be left out when using nasm or .intel_syntax noprefix. Description Performs a signed … Witryna18 mar 2024 · command imul destination, source1, source2 Performs a signed multiplication of two or three operands. This instruction has three forms, depending on the number of operands. One-operand This form is identical to that used by the MUL instruction, just signed.
WitrynaPerforms a signed multiplication of two operands. This instruction has three forms, depending on the number of operands. When an immediate value is used as an …
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