X86 floating point instructions

 

 

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The floating point unit (FPU) was a separate chip through the 80386+80387. It is now located on-chip, but the programming model still requires most data to ? ?Use SIMD instead. Contents. Data Transfer Instructions; Integer Operands; Binary-coded Decimal Operands; Floating-point Operands; Basic Arithmetic x86 is not like that. The problem is that the x86 instruction set wasn't designed with floating-point in mind; they added floating-point instructions to the CPU The data transfer instructions move floating-point, integer, and BCD values between memory and the floating point registers. Table 3-13 Data Transfer For historical reasons, x86-64 has two separate floating-point systems, Either way, floating point operations use a completely different set ofCVTTPS2DQ, Convert with Truncation Packed Single-Precision Floating-Point Values to Packed Signed Doubleword Integer Values. Other instructions are FPU-specific Floating point is like scientific notation. 3.15576ten ? 109 IEEE 754 single precision: 32-bit floating point. Floating-Point on x86-64. Sixteen registers: %xmm0 through %xmm15. • float or double arguments in %xmm0 – %xmm7. • float or double result in %xmm0.

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