similar to: Force spill of vector variables

I saw your information on the internet and I have multiple opportunities available for QA Analysts. The opportunities are available in the Chicago area. A description of the opportunities can be viewed at www.parallelpartners.com. If you or someone you know is interested, please email me a copy of your resume. Thank you Raul Garcia Administrative Manager Parallel Partners 20 N. Wacker

Hi, I need to force all variables of a basic block to spill, i.e., I can't allow basic blocks to share registers. I would like to know where is the most appropriate approach to implement that policy in LLVM. Looking at the LLVM source, it seems that the register allocator is the best choice because it controls the spilling, but I need to guarantee that this policy is not violated by post RA

Hi Andy and list, Just to give you a follow up, I was implementing a transformation pass just as you recommended at the time I sent the email to the list, but at that time I was worried that the code generator would change the order of the instructions created in the LLVM-IR. Indeed, that was the case. Some instructions after ISel were added between the volatile store instructions (which is

Hello All, How can I keep track of the different basic blocks of a program executed over time? Or in other words, how can I annotate the block name (block_a) and the time/cycle at which that blocs (block_a) was executed, and do this for all the blocks on a reasonable simple program? Regards, Raul. -------------- next part -------------- An HTML attachment was scrubbed... URL:

Dear Raul, Instruction selection and instruction scheduling is, to the best of my knowledge, done at the MachineInstr (MI) IR level. The documentation you've read is on the target independent LLVM IR. You will probably need to read the documentation on LLVM's code generator. The documents on Writing an LLVM Backend, the LLVM Target Independent Code Generator, and Machine IR Format

Hello All, I am trying to understand the demanded-bits pass. The example in the source code (below) seems quite explicit. In the example, only 16 bits from a 32 bit variable in IR are demanded and therefore the variable is truncated to a 16 bit variable. %1 = add i32 %x, %y %2 = trunc i32 %1 to i16 However I was wondering if for example, the addition demanded, say 18 bits, would this pass

Hello All, I would like your help to learn how to traverse an LLVM DAG and perform some analysis. I know that llc can be used to view a DAG, but I would like to manipulate them. In particular I'm interested in the instruction selection and the scheduling DAGs. I have read the documentation about writing an analysis pass and I know how to traverse a basic block on a LLVM IR assembly file, but

----- Original Message ----- > From: "Philip Reames via llvm-dev" <llvm-dev at lists.llvm.org> > To: "llvm-dev" <llvm-dev at lists.llvm.org> > Sent: Friday, August 28, 2015 6:21:00 PM > Subject: Re: [llvm-dev] Aligned vector spills and variably sized stack frames > > On 08/28/2015 04:00 PM, Philip Reames via llvm-dev wrote: > > I've run

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Jun Lim via llvm-dev Sent: Thursday, February 22, 2018 11:05 AM Hi All, I found some cases where a spill of a live range in a block is reloaded only in one of its successors, and there is no reload in other paths through other successors. Since the spill is reloaded only in a certain path, it must be okay to sink such

Hi All, I found some cases where a spill of a live range in a block is reloaded only in one of its successors, and there is no reload in other paths through other successors. Since the spill is reloaded only in a certain path, it must be okay to sink such spill close to its reloads. In the AArch64 code below, there is a spill(x2) in the entry, but this value is reloaded only in %bb.1, not in

> From: junbuml at codeaurora.org [mailto:junbuml at codeaurora.org] > Sent: Thursday, February 22, 2018 11:39 AM > > On 2018-02-22 11:14, gberry at codeaurora.org wrote: > > FROM: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] ON BEHALF OF > > Jun Lim via llvm-dev > > SENT: Thursday, February 22, 2018 11:05 AM > > > > Hi All, > > > > I

Hello, My target features some very-high-latency instructions that access an on-chip network (we'll call them FXLV). In one important kernel (snippet below), register allocation needs to spill values resulting from FXLV. The spiller is unaware of FXLV's latency, and thus naively inserts those spills immediately after the FXLV, incurring huge and unnecessary data stalls. FXLV r10,

On 2018-02-22 11:14, gberry at codeaurora.org wrote: > FROM: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] ON BEHALF OF > Jun Lim via llvm-dev > SENT: Thursday, February 22, 2018 11:05 AM > > Hi All, > > I found some cases where a spill of a live range in a block is > reloaded only in one of its successors, and there is no reload in > other paths through other

I've run into a problem that I'm trying to figure out how to address and would welcome ideas and feedback. Today, the vectorizer will nicely vectorize loops using the widest legal vector type for the target. On a reasonable recent machine, this will often end up using AVX2 registers which are 32 bytes wide. If during register allocation, we decide to spill one of these registers, we

I'm trying to compute and print a weighted spill cost based upon the execution frequency of the basic block where the spill is inserted. My goal is to analyse what effect scheduling changes have on the sum of this weighted spill cost in some benchmarks. I've experimented doing this directly before a spill is inserted in InlineSpiller.cpp using MBFI.getBlockFreq()

Hi Quentin, Thanks for the reply! However, we are not using any profiling-based compilation in our current work. We are assuming that, if PGO is disabled, the register allocator (and any other pass that needs basic block frequency info) will be basing its decisions on some kind of *static" basic block frequency info that are based on some compile-time heuristics and at least capture loop

Hi LLVM, I ran into a case where RegAlloc would insert a spill across instruction that had same register for output operand and implicit-def. The effect this had was that spill code would immediately overwrite the output result. Is this the expected result of setting up MyInst this way? In other words, does RegAlloc know to not insert spill in case it sees that output reg is same as one of

Hello All, I want to obtain the LLVM IR of a program (pixel-test.c from pixman library), I am using the following command to obtain the LLVM IR representation of this program: $ clang -fsyntax-only ./test/pixel-test.c -S -emit-llvm -o pixel-test.ll However I get the following error: ./test/utils-prng.h:137:32: error: can't convert between vector values of different size

Given an architecture with two classes of registers: A is general purpose and has an "adequate" number of registers, and C which is special purpose and has very few (e.g. one) register. There are cheap instructions that directly copy from C to A and vice versa. If we need another C register and they are all live, we need to spill one. Currently as far as I can tell, the only way to

On Monday 14 September 2009 12:32, Chris Lattner wrote: > On Sep 11, 2009, at 3:31 PM, David Greene wrote: > > 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