什么会更快，>= 或 >? [英] What will be faster, >= or >?

问题描述

我想知道 > 是否比 >= 更快?我试图对其进行基准测试，但要么需要 0 毫秒，要么需要永远.我知道差异会非常小，但我必须对很多像素进行操作.有人能告诉我什么更快吗?

I was wondering if > is faster then >= ? I tried to benchmark it but either it takes 0ms or it takes forever. I understand that the difference will be really small but i have to operate on a lot pixels. Can someone tell me what is faster?

推荐答案

两个比较都将被编译为机器指令，如 BLT(分支小于)或 BLE(不相等的分支)，它检查一些状态位，如 BLT: NV + -NV(负值 & 不溢出或非负值和溢出)或 BLE: Z + NV + -NV(零或负数 & 不溢出或不负数和溢出).
这些指令通常需要完全相同的时间，因此它们同样快.

Both comparisons will be compiled to machine instructions like BLT (branch on less than) or BLE (branch on less equal), which check some status bits like BLT: N-V + -NV (negative & not overflow or not negative and overflow) or BLE: Z + N-V + -NV (zero or negative & not overflow or not negative and overflow).
These instruction take normally exactly the same time, so they are equally fast.

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