[Bug ipa/96337] [10/11 Regression] GCC 10.2: twice as slow for -O2 -march=x86-64 vs. GCC 9.3/8.4

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96337

--- Comment #9 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
scimark
GCC 9:
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to p...@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         1062.28
FFT             Mflops:   189.17    (N=1048576)
SOR             Mflops:   947.53    (1000 x 1000)
MonteCarlo:     Mflops:   710.10
Sparse matmult  Mflops:  1402.08    (N=100000, nz=1000000)
LU              Mflops:  2062.49    (M=1000, N=1000)

GCC 10:
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to p...@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         1176.22
FFT             Mflops:   201.17    (N=1048576)
SOR             Mflops:   961.33    (1000 x 1000)
MonteCarlo:     Mflops:   708.62
Sparse matmult  Mflops:  1639.66    (N=100000, nz=1000000)
LU              Mflops:  2370.30    (M=1000, N=1000)

So again around 10% improvement for gcc10