Aaron W. LaFramboise wrote:
On a GCC 4.1.1 cross targeted to mips-mips-elf, this C input file:
int sum(int a, int b) {
return a + b + 42;
}
produces this output with -O3:
addiu v0,a0,42
jr ra
addu v0,a1,v0
Why does the compiler place "jr" before "addu"?
The compiler reorders the instructions to take advantage of the branch delay slot. Take a look at the output with -fno-delayed-branch.
Regards, Ryan Mansfield
