similar to: What's "register pressure set"

Hi Xing, The register pressure sets are basically concepts that tells you how may variables can live in register at the same time. This information is available for two different level of abstraction: per register class and per register unit. The register unit is the basic entity we use to represent a register. Tablegen generates all of that for you, so you do not need to worry about them.

Hello, why LLVM does not define physical register limits for MIPS by overriding the TargetRegisterInfo::getRegPressureLimit function the way it’s done for X86 in x86RegisterInfo.cpp and ARM. Thanks in advance. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120818/a8e4f353/attachment.html>

Quentin, My real problem is that my target has separate address and data registers. The way I’d like to try getting better reg-alloc than I am now is to bring out the difference as Early as possible, so I have added p16, p32, p64 to the enum in “MachineValueType.h” And I have called addRegisterClass(MVT::p32, &XyzAddrRegsRegClass); And I have an override for virtual

Hi, While working on adding newlib to my backend I hit the following assert : Assertion failed: BestRC && "Couldn't find the register class", file TargetRegisterInfo.cpp, line 112 The following llvm causes this : define void @specialBreak(i8* %out) nounwind { entry: %out.addr = alloca i8*, align 4 store i8* %out, i8** %out.addr, align 4 %0 = load i8** %out.addr,

I don’t quite follow why you are doing something like this. What is the advantage of this instead of just attaching the AddrRegs regsister class as the register class for your instruction? So that you would have an ADD instruction like %AddrRegOut = ADD %AddrRegIn1, %AddrRegIn2 What kind of problematic regalloc are you trying to avoid with introducing a new backend data type? Marcello > On

The i32 class is defined in include/llvm/CodeGen/ValueTypes.td along with a class for every type in MachineValueTypes.h On Wed, May 25, 2016 at 8:12 PM, Marcello Maggioni via llvm-dev < llvm-dev at lists.llvm.org> wrote: > I don’t quite follow why you are doing something like this. > > What is the advantage of this instead of just attaching the AddrRegs > regsister class as the

Hi Peter, I would recommend looking into the implementation of the matcher if you want to add more builtin types: utils/TableGen//DAGISelMatcherGen.cpp That being said, you can define your own types without having to go through that hassle. E.g., from AArch64 def simm9 : Operand<i64>, ImmLeaf<i64, [{ return Imm >= -256 && Imm < 256; }]> { let ParserMatchClass =

I''ve been trying to get access to a userland string that''s behind a second level pointer using DTrace, but I can''t seem to get it to work. I started with the example on the Team DTrace Tips and Tricks slides: trace(copyinstr(*(uintptr_t *)copyin(arg0, curpsinfo->pr_dmodel == PR_MODEL_ILP32 ? 4 : 8))); And when I couldn''t get it to work, I started

Dumb question about llvm-tblgen for "XyzGenInstrInfo.inc" If I have a pattern in my dot-td-file like this [(set i32:$dst (add i32:$rs1, i32:$rs2))] The question is where does the token "i32" come from, I don't see any definitions for i1, i8, i16, i32, ... in include/llvm/Target/*.td while I do see definitions for tokens like

Craig, Ahha, thanks. Even with that info I had to resort to “find-grep” to figure out how it gets #included, Being indirectly included from “include/llvm/IR/Intrinsics.td” isn’t exactly obvious :=(( Would it be possible move the #include into “Target.td” ? Also, in “ValueTypes.td” there is a comment about needing to keep it coordinated With “MahineValueType.h”, but there is no such

Dear List, This is just a programming problem which i cannot seem to figure out. I am trying to get a set of power from a test (say, kolmogorov smirnov) out of a distribution (say, G-K distribution) as follows. I am trying to reduce to pain of writing the whole set of data points (p# below) using "for" loop. However, I seem to have some problem in it as the output "M" does not

There is a comment in MachineValueTypes.h in the enum. // If you change this numbering, you must change the values in // ValueTypes.td as well! Other = 0, // This is a non-standard value I don't think the .td include can be fixed easily. Tablegen doesn't support include guards and can only include each file once. Looks like there is a build step that runs

> On Aug 30, 2017, at 1:43 PM, Matthias Braun <matze at braunis.de> wrote: > > That means you cannot use the code from RegisterPressure.{cpp|h} to compute this. The other liveness analysis we have in llvm codegen is LiveIntervals (LiveItnervalAnalysis) which gives you a list of liveness segments of a given vreg (the same representation is used in most linear scan allocators even

Hi all, this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs with a separate new dma_alloc_pages API, which is available on all platforms. In addition to cleaning up the convoluted code path, this ensures that other drivers that have asked for better support for non-coherent DMA to pages with incurring bounce buffering over can finally be properly supported. I'm still a

Hello, In a previous email, Matthias mentioned that register pressure estimates in the machine scheduler are not absolute; they only account for the registers that are used in the block.I assume that he meant that registers that are live-through (both live-in and live-out) are not accounted for in register pressure calculations. If a register is either live-in or live-out but not both, it must be

Hi all, this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs with a separate new dma_alloc_pages API, which is available on all platforms. In addition to cleaning up the convoluted code path, this ensures that other drivers that have asked for better support for non-coherent DMA to pages with incurring bounce buffering over can finally be properly supported. As a follow up I

You seem to be using old LLVM sources---changing this many files for supporting a different width LaneBitmask is no longer necessary. Also, boost is not a current requirement for building LLVM and it's unlikely that requiring it for that purpose alone is justified. -Krzysztof On 7/28/2017 6:30 AM, Alex Susu via llvm-dev wrote: > Hello. > I come back to this older thread.

Hello. I come back to this older thread. As I've said before, I managed to patch the various files from the back end related to lanemask in order to support at most 1024 vector lanes. For this I am using a 1024-bit long lanemask of type uint1024_t from boost::multiprecision, instead of uint32_t. For this I changed the following LLVM source files:

On Tue, 18 Jan 2005, John Cortes wrote: >> Can you say a little bit about MACH-SUIF? With a brief google search, I >> didn't turn up anything that described the architecture. Is it a RISC-like >> machine with 32-bit instruction words? >> > > It's another VM representation. I haven't really gotten to know the nitty > gritty of the language so

Chris Lattner wrote: > On Tue, 18 Jan 2005, John Cortes wrote: > >>> Can you say a little bit about MACH-SUIF? With a brief google >>> search, I didn't turn up anything that described the architecture. >>> Is it a RISC-like machine with 32-bit instruction words? >>> >> >> It's another VM representation. I haven't really gotten