On Mon, Oct 17, 2005 at 12:25:46PM +0200, Andi Kleen wrote: > > main: > > leal 4(%esp), %ecx # create argument pointer > > andl $-16, %esp # align stack > > pushl -4(%ecx) # copy return address > > This will misaligned the call/ret stack in the CPU, leading to branch > mispredictions on many of the following RETs. On main it's probably > not a big issue, but for other functions it might be.
No it won't. I don't actually use that for the return insn. I cheat and move the CFA, and that copy satisfies the return address at CFA-4 during the body of the function. r~
