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Re: [XenPPC] [xenppc-unstable] [ppc] Turn on Save and Restore of VMX reg
| To: | xen-ppc-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | Re: [XenPPC] [xenppc-unstable] [ppc] Turn on Save and Restore of VMX registers |
| From: | Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> |
| Date: | Wed, 14 Jun 2006 01:09:32 +0200 |
| Delivery-date: | Tue, 13 Jun 2006 16:09:50 -0700 |
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/* So you might think that we could use the VRSAVE register to * streamline this but "If this [VRSAVE] approach is taken it must be * applied rigorously". I have no idea what this comment is supposed to mean. If you use VRSAVE to select which regs to save and which not, it often hurts to do that selection per register; but doing it per block of four stil pays off. (About equal to blocks of eight in my profiling, btw. Do you own profiling!) NOT AT ALL. Binary pattern 0b00000 for RA means literal 0 instead of GPR0, sure. And the assembler you use just uses CCCP to translate "r0" into a literal 0. But some other assemblers do not. So please just write "0" when you mean "0". - addi r0,r3,CT_VR0 ; stvxl vr0,r0,r0 _______________________________________________ Xen-ppc-devel mailing list Xen-ppc-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ppc-devel |
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