Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH] reduce large stack usage | Date | Sun, 2 Mar 2003 18:07:53 +0100 |
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On Sunday 02 March 2003 16:26, Manfred Spraul wrote:
> What do you mean with broken? On i386, the function needs 32 byte stack > + the space for register saving. > It must be either a gcc bug, or a bug in your detection script - I don't > see anything special in twofish_setkey.
You are right that the code itself is not broken -- I did not read it properly at first. The stack frame gets small if I compile for s390x with -fno-schedule-insn, so I suppose that optimization does not work to well on this particular code. I'll try a different compiler tomorrow.
I can verify the 32 bytes on i386 with both gcc-3.2 and gcc-3.3-snapshot. However, when compiling i386 twofish with gcc-2.95, I get an 804 bytes stack frame. Other architectures are probably somewhere in between i386 and s390x here, so there should be done something about this.
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