[Bug target/19780] Floating point computation far slower for -mfpmath=sse

[uros at kss-loka dot si]

------- Additional Comments From uros at kss-loka dot si  2005-02-03 16:40 
-------
First thing to see is this:

        ...
        mulss   %xmm7, %xmm1
        movss   -12(%ebp), %xmm0
        mulss   %xmm4, %xmm0
        subss   %xmm0, %xmm1
        movss   -12(%ebp), %xmm0
        mulss   %xmm5, %xmm0
        mulss   %xmm6, %xmm3
        ...

Memory access is expensive, but in -mfpmath=387 case we have equivalent code.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19780