Imul source is a signed
WitrynaIMUL This insruction multilplies a signed byte (word) from a source with a signed byte (word) in AL (AX). All details of IMUL are exactly the same as that of MUL, except that if all bits... Witryna27 mar 2024 · The next line we see that z is being loaded into ecx, and then executes imul with eax as the first operand and ecx as the second. This instruction takes the second operand and multiplies it by the first and stores the result in the first operand. This would translate to: x *= z; The original source performs all of this in the return statement.
Imul source is a signed
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Witryna30 lip 2024 · As such, different instructions are used for unsigned multiplication ( mul) and signed multiplication ( imul ). Multiplication typically produces double sized results. That is, multiplying two n -bit values produces a 2 n- bit result. Multiplying two 8-bit numbers will produce a 16-bit result. 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 …
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 … Witryna11 sie 2014 · imul r32, r/m32, imm (32x32->32 multiply) * mul r/m32 (32x32->64 unsigned multiply) Notice that only the "widening" multiply has an unsigned counterpart. The two forms in the middle, marked with an asterisk, are both signed and unsigned multiplication, because for the case where you don't get that extra "upper part", that's …
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. 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 component) are placed in destLO. The high 32 bits (per component) are placed in destHI. Either destHI or destLO may be specified as NULL instead of specifying a register, if …
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. easy halloween devil makeup for kidsWitrynaThe 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 … curiosity stream free redditWitrynaAssistant Head of Housing (interim) Tenancy Sustainment Projects. (I am responsible for the views and opinions I hold) 4d easy halloween decorationsWitryna18 lut 2015 · The description for IMUL r/m8 is AX <- AL * r/m byte. So imul AL multiplies AL with AL and stores the product in AX. In your case AL contains 10h, so the product will be 10h * 10h == 100h. – Michael Feb 18, 2015 at 11:23 3 You are using IDIV, it interprets its operands as signed values. So it is 0FFCEh / 0FFh = -50 / -1 = 50 = … easy halloween desserts recipesWitryna17 gru 2016 · @RossRidge: IMUL sets CF and OF if the upper-half is not the sign-extension of the low half (even the multi-operand versions work that way, so detecting unsigned wraparound when using 2 or 3 operand imul can't be done from just the flags) – Peter Cordes Dec 16, 2016 at 22:47 Show 3 more comments 2 Answers Sorted by: 3 curiosity stream discountWitrynaSprachliche und kommunikative Kompetenz ist, wenn auch mit unterschiedlichen Schwerpunkten, eines von vielen Lernzielen für Lernende in allen Bildungseinrichtungen von der Kindertageseinrichtung bis zur Universität. Gefordert wird unter anderem die easy halloween dipsWitrynaApril 2024 IMUL — Signed Multiply Instruction Operand Encoding¶ Description¶ Performs a signed multiplication of two operands. This instruction has three forms, depending on the number of operands. One-operand form — This form is identical to … easy halloween face int ideas for adults