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x86 Instruction Set Reference. Derived from the September 2014 version of the Intel® 64 and IA-32 Architectures Software Developer's Manual, volumes 2A and 2B. More info at zneak/x86doc COMISD, Compare Scalar Ordered Double-Precision Floating-Point Values and Set EFLAGS. COMISS, Compare Scalar Ordered
The x87 FPU instructions are executed by the so-called "math coprocessor" . These instructions operate on floating-point, integer, and binary-coded decimal (BCD) operands. The main purpose of these instructions are to perform floating-point arithmetic. But nowadays we have SIMD instructions that are much faster
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes
You may notice that some of the instructions below differ from another in name by just one letter: a P appended to the end. This suffix signifies that in addition to performing the normal operation, they also Pop the x87 stack after execution is complete.
For example, the integer PowerPC assembly code to add registers 1 and 2 into register 3 is "add r3,r1,r2"; the floating-point code to add floating-point registers 1 and 2 into floating-point register 3 is "fadd fr3,fr1,fr2". x86 is not like that. The problem is that the x86 instruction set wasn't designed with floating-point in mind; they
10 Jan 2012 You need to use the Floating Point Instruction Set to achieve your goal. Some instructions you might find useful are: fild <int> - loads and integer into st0 (not an immediate faddp - adds st0 to st1, and pop from reg stack (i.e. result in st0) fdivp - divides st0 by st1, then pop from reg stack (again, result in st0).
The entire set of assembler instructions for the FPU is relatively small and could be memorized rapidly. Learning which parameter(s) can be used with each instruction should take only slightly longer. The main difficulty is in developing sound programming techniques to avoid some of the pitfalls peculiar to the FPU.
29 Jun 2012 PC floating point operations were once done in a separate chip - 8087. This chip managed a stack of eight 80 bit floating point values. The stack and instructions still exist, but are largely ignored x86-64 CPUs have 16 floating point registers (128 or 256 bits). These registers can be used for single data
The FST instruction copies the value in the ST(0) register to the destination operand, which can be a memory location or another register in the FPU register stack. When storing the value in memory, the value is converted to single-precision or double-precision floating-point format. The FSTP instruction performs the same
The x86 Assembly Language Reference Manual documents the syntax of the Solaris x86 assembly language. This manual is provided to help experienced assembly language programmers understand disassembled output of Solaris compilers. This manual is neither an introductory book about assembly language
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