Is x>>2 faster than x>>31?
In other words, is sar x, 2 faster than sar x, 31?
I did some simple test, they seem to have the same speed. I would appreciate any solid evidence.
Is logical/arithmetic shift fewer bits faster?
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1 Answers
It would depend on the hardware implementation. For common operations involving a shift by a constant amount (e.g. pointer arithmetic), there could be a faster path (e.g. it might be fused with a related addition operation). For shifting by a variable, a barrel shifter circuitry is used, where any shift amount would have the same delay.
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