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References: <bug-31396-14334@http.gcc.gnu.org/bugzilla/>
Subject: [Bug c/31396] Inline code performance much worse than out-of-line
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From: "jamagallon at ono dot com" <gcc-bugzilla@gcc.gnu.org>
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------- Comment #3 from jamagallon at ono dot com  2007-03-29 23:22 -------
Sample assembler for the loops.
For the funcion, out of line:

#APP
    #FBGN
#NO_APP
    movl    data, %edx
    fldz
    movl    $1, %eax
.L2:
    fadds   -4(%edx,%eax,4)
    addl    $1, %eax
    cmpl    $268435457, %eax
    jne .L2
#APP
    #FEND   
#NO_APP

For the loop in main():

.L11:
    fldl    -56(%ebp)         <= look here
    fadds   -4(%edx,%eax,4)
    fstpl   -56(%ebp)         <= and here
    addl    $1, %eax
    cmpl    $268435457, %eax
    jne .L11


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31396