[Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3

[bonzini at gnu dot org]

------- Comment #19 from bonzini at gnu dot org  2009-02-09 13:37 -------
Also, Dwarak, here the change is not from

    addps  (%rax, %rsi), %xmm1

to

    movps  (%rax, %rsi), %xmm0
    addps  %xmm0, %xmm1

but rather from

    movps  %xmm0, %xmm1
    addps  (%rax, %rsi), %xmm1

to the second snippet above.  Does this pessimize on AMD too?  I don't think
so, it should be 1 uop less, but I'd rather have confirmation.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824