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by BeeOnRope
2251 days ago
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On x86 it's actually mixed: scalar shifts behave as you describe, but vectorised logical shifts flush to zero when the shift amount is greater than the element size! So x86 actually has both behaviors in one box (three behaviors if you could the 32-bit and 64-bit scalar things you mentioned separately). This is an example of where UB for simple operations actually helps even on a single hardware platform: it allows efficient vectorization. |
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