------- Comment #2 from rakdver at kam dot mff dot cuni dot cz 2010-07-15 17:44 ------- Subject: Re: over-prefetched for arrays of complex number
> This is a piece of code that shows the two prefetches for b. > > mulss %xmm4, %xmm5 > addq $8, %rdx > prefetcht0 96(%r11) > prefetcht0 100(%r11) > subss %xmm2, %xmm1 > addss %xmm5, %xmm0 > > In collecting memory references for the loops, the array of the imagine part > is put into the different group from that of the real part (and thus two > prefetches are generated). > > eference 0x2d61e70: > group 0x2d63630 (base REALPART_EXPR <*b_64(D)... > > Reference 0x2d615e0: > group 0x2d40f40 (base IMAGPART_EXPR <*b_64(D)... > > I think that the base should be reduced to the same, with a offset of 4. > So they can be in the same group. agreed, Zdenek -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44955