[Bug tree-optimization/88760] GCC unrolling is suboptimal

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760

--- Comment #8 from ktkachov at gcc dot gnu.org ---
btw looks likes ICC vectorises this as well as unrolling:
..B1.14:                        
        movl      (%rcx,%rbx,4), %r15d                          
        vmovsd    (%rdi,%r15,8), %xmm2                          
        movl      4(%rcx,%rbx,4), %r15d                         
        vmovhpd   (%rdi,%r15,8), %xmm2, %xmm3                   
        movl      8(%rcx,%rbx,4), %r15d                         
        vfmadd231pd (%r10,%rbx,8), %xmm3, %xmm0                 
        vmovsd    (%rdi,%r15,8), %xmm4                          
        movl      12(%rcx,%rbx,4), %r15d                        
        vmovhpd   (%rdi,%r15,8), %xmm4, %xmm5                   
        movl      16(%rcx,%rbx,4), %r15d                        
        vfmadd231pd 16(%r10,%rbx,8), %xmm5, %xmm1               
        vmovsd    (%rdi,%r15,8), %xmm6                          
        movl      20(%rcx,%rbx,4), %r15d                        
        vmovhpd   (%rdi,%r15,8), %xmm6, %xmm7                   
        movl      24(%rcx,%rbx,4), %r15d                        
        vfmadd231pd 32(%r10,%rbx,8), %xmm7, %xmm0               
        vmovsd    (%rdi,%r15,8), %xmm8                          
        movl      28(%rcx,%rbx,4), %r15d                        
        vmovhpd   (%rdi,%r15,8), %xmm8, %xmm9                   
        vfmadd231pd 48(%r10,%rbx,8), %xmm9, %xmm1               
        addq      $8, %rbx                                      
        cmpq      %r14, %rbx                                    
        jb        ..B1.14 

Is that something GCC could reasonably do?