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Good Afternoon. I am a Computer Science undergraduate student in Brazil and as completion of course work, I am developing an register allocator, using the infrastructure of the LLVM. To accomplish this task, I have based my implementation in allocators already implemented in LLVM. But a question came to me while I was researching in books and articles of compiler theory and own documentation of

...> MySchedRegistry("mysched", "Custom My scheduler.", createMySched); > > -Andy > I've had a quick experiment with the MI Scheduler, and have a few further questions. From what I can see, if I pass -enable-misched to the compiler, it only works above O1, though addOptimizedRegAlloc(). Is O0 not supported without adding the pass myself in my PassConfig? How does (or will) the MI Scheduler interact with the existing SD Scheduler? It seems as though they both run together at the moment. Thanks, Fraser -------------- next part -------------- An HTML attachment was scrubbed......

...ost register allocation in lib/CodeGen/Passes.cpp void TargetPassConfig::addMachinePasses() { . . . // Run pre-ra passes. addPreRegAlloc(); // Run register allocation and passes that are tightly coupled with it, // including phi elimination and scheduling. if (getOptimizeRegAlloc()) addOptimizedRegAlloc(createRegAllocPass(true)); else addFastRegAlloc(createRegAllocPass(false)); // Run post-ra passes. addPostRegAlloc(); // Adding a new pass here which keeps register mask information across function calls. . . . } But this also requires current register allocators to use this information...

On May 9, 2013, at 4:02 AM, Fraser Cormack <fraser at codeplay.com> wrote: > I have an instruction that takes no operands, and produces two results, in two consecutive cycles. > > I tried both of the following to my Schedule.td file: > > InstrItinData<IIMyInstr, [InstrStage<2, [FuncU]>], [1, 2]>, > InstrItinData<IIMyInstr, [InstrStage<1,

...void TargetPassConfig::addMachinePasses() { > . > . > . > // Run pre-ra passes. > addPreRegAlloc(); > > // Run register allocation and passes that are tightly coupled with it, > // including phi elimination and scheduling. > if (getOptimizeRegAlloc()) > addOptimizedRegAlloc(createRegAllocPass(true)); > else > addFastRegAlloc(createRegAllocPass(false)); > > // Run post-ra passes. > addPostRegAlloc(); > // Adding a new pass here which keeps register mask information across function calls. > . > . > . > } > > But this also...

...void TargetPassConfig::addMachinePasses() { > . > . > . > // Run pre-ra passes. > addPreRegAlloc(); > > // Run register allocation and passes that are tightly coupled with it, > // including phi elimination and scheduling. > if (getOptimizeRegAlloc()) > addOptimizedRegAlloc(createRegAllocPass(true)); > else > addFastRegAlloc(createRegAllocPass(false)); > > // Run post-ra passes. > addPostRegAlloc(); > // Adding a new pass here which keeps register mask information across function calls. > . > . > . > } > > But this also...

...; void TargetPassConfig::addMachinePasses() { > . > . > . > // Run pre-ra passes. > addPreRegAlloc(); > > // Run register allocation and passes that are tightly coupled with it, > // including phi elimination and scheduling. > if (getOptimizeRegAlloc()) > addOptimizedRegAlloc(createRegAllocPass(true)); > else > addFastRegAlloc(createRegAllocPass(false)); > > // Run post-ra passes. > addPostRegAlloc(); > // Adding a new pass here which keeps register mask information across > function calls. > . > . > . > } > > But this al...

...t; > // including phi elimination and scheduling. > > > > > > > > > > > > > > > > > > > > > if (getOptimizeRegAlloc()) > > > > > > > > > > > > > > > > > > > > > addOptimizedRegAlloc(createRegAllocPass(true)); > > > > > > > > > > > > > > > > > > > > > else > > > > > > > > > > > > > > > > > > > > > addFastRegAlloc(createRegAllocPass(false)); &gt...

I have an instruction that takes no operands, and produces two results, in two consecutive cycles. I tried both of the following to my Schedule.td file: InstrItinData<IIMyInstr, [InstrStage<2, [FuncU]>], [1, 2]>, InstrItinData<IIMyInstr, [InstrStage<1, [FuncU]>, InstrStage<1, [FuncU]>], [1, 2]>, From what I can see in examples, these say that the first

...s() { >> . >> . >> . >> // Run pre-ra passes. >> addPreRegAlloc(); >> >> // Run register allocation and passes that are tightly coupled with it, >> // including phi elimination and scheduling. >> if (getOptimizeRegAlloc()) >> addOptimizedRegAlloc(createRegAllocPass(true)); >> else >> addFastRegAlloc(createRegAllocPass(false)); >> >> // Run post-ra passes. >> addPostRegAlloc(); >> // Adding a new pass here which keeps register mask information across >> function calls. >> . >> ....

...) { >> . >> . >> . >> // Run pre-ra passes. >> addPreRegAlloc(); >> >> // Run register allocation and passes that are tightly coupled with it, >> // including phi elimination and scheduling. >> if (getOptimizeRegAlloc()) >> addOptimizedRegAlloc(createRegAllocPass(true)); >> else >> addFastRegAlloc(createRegAllocPass(false)); >> >> // Run post-ra passes. >> addPostRegAlloc(); >> // Adding a new pass here which keeps register mask information across function calls. >> . >> . >&gt...

...t;>> // Run pre-ra passes. >>> addPreRegAlloc(); >>> >>> // Run register allocation and passes that are tightly coupled with >>> it, >>> // including phi elimination and scheduling. >>> if (getOptimizeRegAlloc()) >>> addOptimizedRegAlloc(createRegAllocPass(true)); >>> else >>> addFastRegAlloc(createRegAllocPass(false)); >>> >>> // Run post-ra passes. >>> addPostRegAlloc(); >>> // Adding a new pass here which keeps register mask information across >>> function...

...> > > > > > > > > > > > > > > > > > > > > > > > if (getOptimizeRegAlloc()) > > > > > > > > > > > > > > > > > > > > > > > > > > > > addOptimizedRegAlloc(createRegAllocPass(true)); > > > > > > > > > > > > > > > > > > > > > > > > > > > > else > > > > > > > > > > > > > > > > > > > > > > >...

...asses. >>>> addPreRegAlloc(); >>>> >>>> // Run register allocation and passes that are tightly coupled with >>>> it, >>>> // including phi elimination and scheduling. >>>> if (getOptimizeRegAlloc()) >>>> addOptimizedRegAlloc(createRegAllocPass(true)); >>>> else >>>> addFastRegAlloc(createRegAllocPass(false)); >>>> >>>> // Run post-ra passes. >>>> addPostRegAlloc(); >>>> // Adding a new pass here which keeps register mask information acros...

...> > > > > > > > if (getOptimizeRegAlloc()) > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > addOptimizedRegAlloc(createRegAllocPass(true)); > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > else > > > > > > >...

...addPreRegAlloc(); >>>>> >>>>> // Run register allocation and passes that are tightly coupled with >>>>> it, >>>>> // including phi elimination and scheduling. >>>>> if (getOptimizeRegAlloc()) >>>>> addOptimizedRegAlloc(createRegAllocPass(true)); >>>>> else >>>>> addFastRegAlloc(createRegAllocPass(false)); >>>>> >>>>> // Run post-ra passes. >>>>> addPostRegAlloc(); >>>>> // Adding a new pass here which keeps registe...

...>>>>> >>>>>> // Run register allocation and passes that are tightly coupled >>>>>> with it, >>>>>> // including phi elimination and scheduling. >>>>>> if (getOptimizeRegAlloc()) >>>>>> addOptimizedRegAlloc(createRegAllocPass(true)); >>>>>> else >>>>>> addFastRegAlloc(createRegAllocPass(false)); >>>>>> >>>>>> // Run post-ra passes. >>>>>> addPostRegAlloc(); >>>>>> // Adding a new pass...

...void TargetPassConfig::addMachinePasses() { > . > . > . > // Run pre-ra passes. > addPreRegAlloc(); > > // Run register allocation and passes that are tightly coupled with it, > // including phi elimination and scheduling. > if (getOptimizeRegAlloc()) > addOptimizedRegAlloc(createRegAllocPass(true)); > else > addFastRegAlloc(createRegAllocPass(false)); > > // Run post-ra passes. > addPostRegAlloc(); > // Adding a new pass here which keeps register mask information across function calls. > . > . > . > } > > But this also...

...) { >> . >> . >> . >> // Run pre-ra passes. >> addPreRegAlloc(); >> >> // Run register allocation and passes that are tightly coupled with it, >> // including phi elimination and scheduling. >> if (getOptimizeRegAlloc()) >> addOptimizedRegAlloc(createRegAllocPass(true)); >> else >> addFastRegAlloc(createRegAllocPass(false)); >> >> // Run post-ra passes. >> addPostRegAlloc(); >> // Adding a new pass here which keeps register mask information across function calls. >> . >> . >&gt...

...>>>>>>> // Run register allocation and passes that are tightly coupled >>>>>>> with it, >>>>>>> // including phi elimination and scheduling. >>>>>>> if (getOptimizeRegAlloc()) >>>>>>> addOptimizedRegAlloc(createRegAllocPass(true)); >>>>>>> else >>>>>>> addFastRegAlloc(createRegAllocPass(false)); >>>>>>> >>>>>>> // Run post-ra passes. >>>>>>> addPostRegAlloc(); >>>>>>&g...