[Bug fortran/88533] [9 Regression] Higher performance penalty of array-bounds checking for sparse-matrix vector multiply

[anlauf at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88533

--- Comment #4 from Harald Anlauf <anlauf at gmx dot de> ---
Without CONTIGUOUS, I see -O3 brings gcc-9 to the level of gcc-7 or gcc-8:

baseline + -O3 -funroll-loops -fcheck=bounds :

7: 1.57
8: 1.40
9: 1.57

baseline + -O3 -funroll-loops -fcheck=bounds -fno-tree-ch :

7: 1.76
8: 1.55
9: 1.54

So there's something between -O2 and -O3 that helps sometimes.