benchmark result

Tue Dec 7 11:12:00 GMT 2004

Mathieu Lacage writes:
 > On Tue, 2004年12月07日 at 10:52 +0000, Andrew Haley wrote:
 > > What CPU are you using? I would expect these calls to log to be
 > > inlined on an x86.
 > 
 > pentium4: -O2 -mtune=pentium4 -ffast-math
That shouldn't happen; there should be no calls to _ieee754_log. I
just tried a simple test with
public class f
{
 public static void main (String[] s)
 {
 System.err.println (Math.log (2.4));
 }
}
/local/aph/gcc-3_4-branch/build/gcc/gcj -B/local/aph/gcc-3_4-branch/build/gcc/ -S -ffast-math -O2 f.java
and the call to log was inlined as a CPU instruction, not a call to "log":
f.main(java.lang.String[]):
.LFB2:
 pushl %ebp
.LCFI0:
 movl %esp, %ebp
.LCFI1:
 pushl %ebx
.LCFI2:
 subl 20, %esp
.LCFI3:
 cmpb 13, java.lang.System.class$+86
 movl f.class,ドル (%esp)
 setg %bl
 call _Jv_InitClass
 testb %bl, %bl
 je .L5
.L3:
 fldl .LC0
 fldln2
 fxch %st(1)
 movl java.lang.System.err, %edx
 fyl2x
 movl (%edx), %eax
 movl %edx, (%esp)
 fstpl 4(%esp)
 call *112(%eax)
 addl 20, %esp
 popl %ebx
 popl %ebp
 ret
 .p2align 4,,7
.L5:
 movl java.lang.System.class,ドル (%esp)
 call _Jv_InitClass
 jmp .L3