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...which instruction during scheduling. This is purely for debugging purposes. Since I'm somewhat new to LLVM it is a bit difficult for me to figure this out. Initial idea was to insert comments in the generated assembly which would tell me what what resource is used. MachineInstr has a uint8_t AsmPrinterFlags, which I want to use to pass information from the scheduler to AsmPrinter about which resource is used. I've asked on the IRC channel how to do it but nobody seems to know. A scheduling debug log was also mentioned (supposedly it should provide me with the same information) but I don't kno...

...ote: > Attached is a patch to print asm comments for spill information. > We've discussed the mechanisms before but I wanted to run the > patch by everyone before I start to commit pieces. Some thoughts: The general approach to enhancing CreateStackObject and adding MachineInstr::AsmPrinterFlags seems fine to me! The testcase should use filecheck to avoid running llc 4 times. Also, it seems better to design a situation where you just have 16 live variables instead of taking some random function for gcc (you're implicitly depending on how ra is handling this code instead of...

Attached is a patch to print asm comments for spill information. We've discussed the mechanisms before but I wanted to run the patch by everyone before I start to commit pieces. -Dave -------------- next part -------------- A non-text attachment was scrubbed... Name: spillcomments.patch Type: text/x-diff Size: 58930 bytes Desc: not available URL:

...to print asm comments for spill information. > > We've discussed the mechanisms before but I wanted to run the > > patch by everyone before I start to commit pieces. > > Some thoughts: > > The general approach to enhancing CreateStackObject and adding > MachineInstr::AsmPrinterFlags seems fine to me! Ok. > The testcase should use filecheck to avoid running llc 4 times. Also, > it seems better to design a situation where you just have 16 live > variables instead of taking some random function for gcc (you're > implicitly depending on how ra is handling this...

On Jul 31, 2009, at 11:17 AM, David Greene wrote: > I'm getting to the point where I want to contribute some more > MachineInstr comment support for things like spills. As we've > discussed before, we don't have all of the information available > in AsmPrinter to synthesize the kind of comments that can be > helpful for debugging performance issues with register

I'm getting to the point where I want to contribute some more MachineInstr comment support for things like spills. As we've discussed before, we don't have all of the information available in AsmPrinter to synthesize the kind of comments that can be helpful for debugging performance issues with register allocators (our primary use for these kinds of comments). In order to get this