search for: deadness

Hi LLVMers, I have finally sorted out licensing issues and found some time, so I'm trying to port my PBQP register allocator to 2.4 in order to contribute it (if you want it). I've run into a bug that has me confused though. I'm currently failing the following assertion: llc: VirtRegMap.cpp:1733: void<unnamed>::LocalSpiller::RewriteMBB(llvm::MachineBasicBlock&,

On Sep 3, 2008, at 5:58 AM, Lang Hames wrote: > Hi LLVMers, > > I have finally sorted out licensing issues and found some time, so I'm > trying to port my PBQP register allocator to 2.4 in order to Nice! We would definitely welcome your contribution. > > contribute it (if you want it). I've run into a bug that has me > confused though. > > I'm currently

For the x86-64 target, I tried compiling a simple hello world. I don't understand the live interval information. Here's the machine instructions as dumped by LiveIntervalAnalysis: ********** MACHINEINSTRS ********** file hello.c line 3 b: 0 FNSTCW16m <fi#0>, 1, %NOREG, 0 FNSTCW16m <fi#0> 1 %mreg(0) 0 4 MOV8mi <fi#0>, 1, %NOREG, 1, 2 MOV8mi <fi#0> 1 %mreg(0) 1 2 8

Most of the states were calling SET_NEXT_STATE(%.DEAD) then using return -1 on error, to reflect the fact that they had also called set_error() and wanted the caller to notice the failure. Unfortunately, the state machine engine refuses to run the entry code of the next state when the current state returned -1, which meant the DEAD state entry code never runs. A concrete example of the problems

On Jun 26, 2007, at 11:20 AM, David A. Greene wrote: > > 28 %AL<dead> = MOV8rr %reg1024<kill>, %EAX<imp-def> > MOV8rr %mreg(2)<d> %reg1024 %mreg(17)<d> > 32 CALL64pcrel32 <ga:printf>, %RDI<kill>, %RAX<imp-def>, %RCX<imp- > def,dead>, > %RDX<imp-def,dead>, %RSI<imp-def,dead>, %RDI<imp-def,dead>, >

Hi. I am trying to run LLVM with JIT on ARM processor (Android phone). Currently I have problems using external functions. Any call to external function crashes and gives me signal 11 (SIGSEGV) at some random address. I'm trying to run following C code: *** extern void add1(int* x); int main() { int a = 10; int b = 20; add1(&b); int c = a + b; return c; } *** It gives

Evan, thanks for responding so quickly. On Tuesday 26 June 2007 14:11, Evan Cheng wrote: > On Jun 26, 2007, at 11:20 AM, David A. Greene wrote: > > 28 %AL<dead> = MOV8rr %reg1024<kill>, %EAX<imp-def> > > MOV8rr %mreg(2)<d> %reg1024 %mreg(17)<d> > > 32 CALL64pcrel32 <ga:printf>, %RDI<kill>, %RAX<imp-def>, %RCX<imp- > >

> On Jun 27, 2017, at 2:10 PM, Matthias Braun <mbraun at apple.com> wrote: > >> >> On Jun 27, 2017, at 4:55 AM, Mikael Holmén via llvm-dev <llvm-dev at lists.llvm.org> wrote: >> >> Hi Quentin and llvm-dev, >> >> I've got a regalloc-related question that you might have an opinion or answer about. >> >> In our out-of-tree

Not sure if I could follow everything in this discussion regarding subregisters. But I think the problem posted by Mikael just happened to involve subregisters, and the discussions about subregisters is confusing when it comes to Mikaels original question/problem. I think that the bundle could look something like this just as well: BUNDLE %vreg1<def,dead> * %vreg1<def> =

On Jun 26, 2007, at 12:57 PM, David Greene wrote: > Evan, thanks for responding so quickly. > > On Tuesday 26 June 2007 14:11, Evan Cheng wrote: >> On Jun 26, 2007, at 11:20 AM, David A. Greene wrote: >>> 28 %AL<dead> = MOV8rr %reg1024<kill>, %EAX<imp-def> >>> MOV8rr %mreg(2)<d> %reg1024 %mreg(17)<d> >>> 32 CALL64pcrel32

> On Jun 27, 2017, at 2:44 PM, Krzysztof Parzyszek via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > On 6/27/2017 4:35 PM, Quentin Colombet via llvm-dev wrote: >> Yeah I was reading this as “only the non-touched part are dead”, and that’s what I’d like to see in the representation longer. Obviously, the register is not dead as a whole here :) > > I think that having

My home e--mail is down, which is where I get my llvm feeds, so please copy any replies to this address as well as the list. The call instruction can define implicit defs. What are the semantics when the call includes a use with a kill of some register and also an implicit def of that register? Is the register to be considered live out at that point? I've found a failing testcase where

You are right about your interpretation of "dead". The case here is that RSP is a reserved register and so its liveness isn't really tracked. The "implicit-def dead" is an idiom used to mean that the register (reserved or not) is clobbered. The other implicit uses/defs can come from instruction definitions to indicate that this instruction uses and/or modifies a given

Hi, My understanding of a "dead" register is a def that is never used. However, when I dump the MI after reg alloc on a simple program I see the following sequence: ADJCALLSTACKDOWN64 0, 0, 0, *implicit-def dead %rsp*, implicit-def dead %eflags, implicit-def dead %ssp, implicit %rsp, implicit %ssp CALL64pcrel32 @foo, <regmask %bh %bl %bp %bpl %bx %ebp %ebx %rbp %rbx %r12 %r13 %r14

Hi Quentin and llvm-dev, I've got a regalloc-related question that you might have an opinion or answer about. In our out-of-tree target we've been doing some bundling before register allocation for quite some time now, and last night a new problem popped up. What the fix should be depends on if this bundle is legal or not: BUNDLE %vreg39<imp-def,dead> *

I have a usb hd that I use for backup. Occasionally it dies. scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device scsi 6:0:0:0: rejecting I/O to dead device Buffer I/O error on device sdc1, logical block 0 lost page write due to I/O error on sdc1 EXT2-fs error (device sdc1): read_inode_bitmap: Cannot read inode bitmap -

> On Jun 28, 2017, at 5:10 PM, Quentin Colombet via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Oh wait, vreg1 is indeed used. > Yeah, having a dead flag here sounds wrong. I mean on the instruction itself. On the bundle, that’s debatable. That would fit the semantic “if no side effect you can kill it” (here there is side effect, we define other vregs). > >> On

On 20/05/2010, at 3:01 AM, Chris Lattner wrote: > > On May 19, 2010, at 7:07 AM, o.j.sivart at gmail.com wrote: > >> Hi all, >> >> I'm interested in the impact of representing code via intrinsic functions, in contrast to via an instruction, when it comes to performing dead instruction/code elimination. As a concrete example, lets consider the simple case of the

Anyone have any clues about how to sanitize a dead SSD? We haven't had it yet, but we're sure it's coming. Esp. since I'm a federal contractor, a dead disk gets deGaussed, but what the hell do you do with a SSD?

I saw there is reference to dead def on registers in LLVM source code. I am not aware of this concept from the traditional course material. What are the properties of dead def? Cheers Thomson -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150101/ea39d1e4/attachment.html>