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462823
2018 Apr 03
1
Ineffective code after loop unrolling with -O3, ok with -Os
Hi all,
I found some issues during my testing of "loop unrolling" capabilities of
LLVM's opt.
Seems like LLVM generates slower code with -O3 since it wrongly decides to
unroll a simple loop.
With option -Os, no loop unrolling, the output looks well.
Code: