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On 05-Feb-16 13:19, Rodrigo Azevedo wrote:
Conclusion, "one computed goto -O3 -fno-gcse -fno-crossjumping" may
represent a real improvement.

I had bad surprises with -O3, such as added back and forth jumps that disrupted my critical code; I tend to avoid it.

That happened with a low-end microcontroller, so it may or may not apply here.