[Bug middle-end/54201] XMM constant duplicated

[cesarb at cesarb dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54201

--- Comment #3 from Cesar Eduardo Barros <cesarb at cesarb dot net> 2012-08-08 23:28:52 UTC ---
Created attachment 27964
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27964
Another testcase

Another testcase. This one also shows it using two registers instead of one.

        movdqa  .LC0(%rip), %xmm3
        pand    %xmm3, %xmm0
        movdqa  .LC1(%rip), %xmm2
        pcmpeqb %xmm2, %xmm0
        pand    %xmm1, %xmm0
        pand    %xmm3, %xmm0
        pcmpeqb %xmm2, %xmm0

%xmm2 and %xmm3 have the same value, so it is increasing the register pressure
unnecessarily.