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I have gone through many reference documents about how a GCC compiler optimizes program. But I am not sure how actually a programmer request GCC attempt to optimize a program. Plz help answering this question and also if any reference links would be helpful. Thanks!!

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Belongs to the main stackexchange site. – Yuval Filmus Feb 11 at 4:17
Check the GCC documentation, it describes the options in excruciating detail. Or just use -O2, except for very specific cases, this should give good enough code. – vonbrand Feb 11 at 4:34

closed as off topic by Yuval Filmus, vonbrand, Nicholas Mancuso, Peter Shor, Sasho Nikolov Feb 11 at 5:15

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1 Answer

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Use the flags -Oxxx. There are lots of different flags, and a few "preset levels" -O0 to -O3. Level 0 means no optimization. Level 3 is full optimization, and could cause bugs (that actually happened to me quite a few times). I usually use level 2.

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