为什么AVX512-IFMA仅支持52位整数? [英] Why does AVX512-IFMA support only 52-bit ints?

问题描述

从该值可以推断出它使用与双精度浮点硬件相同的组件.但是double的尾数为53位，那么为什么AVX512-IFMA限制为52位?

From the value we can infer that it uses the same components as double-precision floating-point hardware. But double has 53 bits of mantissa, so why is AVX512-IFMA limited to 52 bits?

推荐答案

IEEE-754 double精度实际上只有52个显式存储的位，第53位(最高有效位)是隐式1.

IEEE-754 double precision actually only has 52 explicitly stored bits, the 53rd bit (the most significant bit) is an implicit 1.

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