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jandrese
on Nov 30, 2020
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How many registers does an x86-64 CPU have?
I still remember benchmarking the various optimization options in GCC and the only one that consistently and significantly improved performance on real code was -fomit-frame-pointer.
praptak
on Nov 30, 2020
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It saves one push per function call, which probably helps more than freeing up the register.
jandrese
on Nov 30, 2020
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The improvement was dramatic. IIRC 20-25% faster code pretty much every time. Nothing else in the optimization set even came close.
mr_toad
on Nov 30, 2020
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Back in the days before on-chip caches register memory was vastly faster than main memory.
sroussey
on Nov 30, 2020
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My custom builds of MySQL and PHP back in the day did exactly that.
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