[Bug tree-optimization/31079] 20% difference between ifort/gfortran, missed vectorization

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2008-08-18 15:22 -------
That is, GCCs inner loop is

.L6:
        addl    $1, %eax
        addsd   %xmm12, %xmm11
        cmpl    $100000000, %eax
        addsd   %xmm14, %xmm3
        addsd   %xmm15, %xmm2
        addsd   %xmm13, %xmm1
        jne     .L6

which doesn't necessarily look slower than ICCs.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079