Displaying 20 results from an estimated 200 matches similar to: "Possible bug in adjusting PHINode from removePredecessor?"
2013 Aug 25
0
[LLVMdev] removePredecessor() and update predecessor list
Hi all,
for(pred_iterator PI=pred_begin(BB); PI!=pred_end(BB); PI++)
{
BasicBlock *Pres = *PI;
pred.insert(Pres);
}
for(predit = pred.begin(); predit!=pred.end();predit++)
(BB)->removePredecessor(*predit);
Is this code enough to remove the predecessor for each basic block As I
read in documentation that this removePredecessor() doesn't update the
predecessor list.
So,
2007 Nov 02
2
Concatenate strings
Hi everyone.
Mandatory disclaimer: New to puppet/clueless but learning/please don''t get
fed up with me yet...
Mandatory praise: Love puppet so far...
Mandatory stupid first question:
How do I concatenate a variable to an arbitrary string?
ie.
$someval="$hostname_prod_config"
So if $hostname is "myserver", then $someval should result in
2020 May 15
3
ConstantFoldTerminator doesn't delete trivially dead phi inputs
I'm looking into some missed optimizations where CodeGenPrepare seems
to leave trivially dead instructions lying around.
This happens because CodeGenPrepare::runOnFunction calls
ConstantFoldTerminator which folds a "br i1 false" into an
unconditional branch and calls BasicBlock::removePredecessor which
calls PHINode::removeIncomingValue. Each incoming value that is
removed from a
2008 Sep 27
2
[LLVMdev] SwitchInstr::removeCase() doesn't remove PHINodes' predecessors
Hi,
I've been writing an optimization pass (described on the ML previously).
Sometimes this pass removes some case entries from switch instructions,
which cause an abort because removeCase() doesn't fix the PHINodes
predecessors when needed.
e.g.:
define i32 @foo() nounwind {
ifthen:
%call = call i32 @bar()
switch i32 %call, label %myphi [
i32 0, label %ifelse
i32 1, label
2008 Sep 27
0
[LLVMdev] SwitchInstr::removeCase() doesn't remove PHINodes' predecessors
Nuno Lopes wrote:
> PHINode should have one entry for each predecessor of its parent basic
> block!
> %ret.0 = phi i32 [ 0, %ifthen ], [ 1, %ifelse ] ; <i32>
> [#uses=1]
> Broken module found, compilation aborted!
>
> This is because myphi is not reachable from ifthen anymore. My question is:
> is this a bug (or missing feature) or do I need to
2009 May 08
2
[LLVMdev] Splitting a basic block, replacing it's terminator
Hi,
I want to insert a conditional branch in the middle of a basic block.
To that end, I am doing these steps:
(1) Split the basic block:
bb->splitBasicBlock()
(2) Remove the old terminator:
succ->removePredecessor(bb)
bb->getTerminator()->getParent()
(3) Adding a new terminator:
BranchInst::Create(ifTrue, ifFalse, cnd, "", bb);
That seems to work, but later passes
2019 Jun 04
2
is this a bug in PruneEH?
I have the following C source:
extern unsigned int donut;
void f1();
void f2();
void f1()
{
unsigned int *magic = &donut;
if (*magic != 286529877) {
f2();
}
}
void f2() {
/* Loop here forever if application is built with wrong version of ROM image */
while(1) {
;
}
}
The -O2 level PruneEH pass uses SimplifyFunction() which contains this code:
for
2006 Sep 18
2
[LLVMdev] llvm-g++: Internal error
Hi,
i used CVS to checkout the source of llvm and llvm-gcc, compiled and built
them on my machine successfully.
i tried a c-language hello program, it was OK.
But when i tried a c++-language hello program, i got:
~/project/llvm/examples$ llvm-g++ t3.cc -o t3
gccld:
/developer/zsth/project/llvm/src/llvm/lib/Analysis/IPA/CallGraph.cpp:277:
void
2006 Sep 14
1
[LLVMdev] use LLVM to convert C++ code to C code
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
Hi,<br>
I am newbie to llvm.<br>
<br>
I am unable to generate
2017 Feb 14
2
[PATCH 1/2] GCC 7: Add __attribute__((noreturn)) to some usage functions which call exit.
This happens with GCC 7.0.1. The errors were all of the form:
qemu-speed-test.c: In function 'main':
qemu-speed-test.c:153:7: error: this statement may fall through [-Werror=implicit-fallthrough=]
usage (EXIT_SUCCESS);
^~~~~~~~~~~~~~~~~~~~
qemu-speed-test.c:155:5: note: here
default:
^~~~~~~
---
builder/index-validate.c | 2 +-
2006 Jul 14
1
passing an entire hash to an action
Is it possible to pass the entire contents of a hash to an action via
link_to_remote?
I know that when you want to pass a value you say link_to_remote("link
name", :url => {:action=>"some action", :someName => someVal} )
This works for when you want to pass strings but I want to be able to
pass a reference to a list of models that is stored in a hash to the
2016 Jun 16
2
Intended behavior of CGSCC pass manager.
> To clarify, we're trying to provide this invariant on the "ref" graph or
> on the graph with direct calls only? I think the invariant need only apply
> to the former
>
More clarification needed :) What do you mean by 'invariant need only apply
to the former'?
> if we're relying on this for correctness (i.e. an analysis must visit all
> callees
2009 May 08
0
[LLVMdev] Splitting a basic block, replacing it's terminator
On May 8, 2009, at 4:02 PM, Nick Johnson wrote:
> I want to insert a conditional branch in the middle of a basic block.
> To that end, I am doing these steps:
>
> (1) Split the basic block:
> bb->splitBasicBlock()
>
> (2) Remove the old terminator:
> succ->removePredecessor(bb)
> bb->getTerminator()->getParent()
Assuming that the new block will still be a
2009 Aug 16
2
[LLVMdev] Throwing function being marked nounwind under optimzation?
All,
The following relatively simple function is behaving oddly under SJLJ
exception handling. Specifically, it's being diagnosed by the
optimizer as being a nounwind function, which is obviously incorrect.
From what I can tell so far, something is going wrong analyzing the
call to __cxa_end_catch()
invoke arm_apcscc void @__cxa_end_catch()
to label %Unwind unwind label
2017 May 01
4
RFC: Stop using redundant PHI node entries for multi-edge predecessors
Hi,
On Mon, May 1, 2017 at 8:47 AM, Daniel Berlin via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>> Today, the IR requires that if you have multiple edges from A to B
>> (typically with a switch) any phi nodes in B must have an equal number of
>> entries for A, but that all of them must have the same value.
>
>> This seems rather annoying....
>> 1) It
2013 Jul 31
1
[LLVMdev] Problem to remove successors
Hi All,
I need to remove successors from every basic block to insert new ones
I tried this code, but it doesn't work
void RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum) {
assert(SuccNum < TI->getNumSuccessors() &&
"Trying to remove a nonexistant successor!");
// If our old successor block contains any PHI nodes, remove the entry
in the
//
2012 Jan 02
0
[LLVMdev] Transforming wide integer computations back to vector computations
On Jan 2, 2012, at 10:00 AM, Duncan Sands <baldrick at free.fr> wrote:
> Hi Matt,
>
>> It seems that one of the optimization passes (it seems to be SROA) sometimes transforms computations on vectors of ints to computations on wide integer types; for example, I'm seeing code like the following after optimizations(*):
>>
>> %0 = bitcast<16 x i8>
2018 Feb 16
3
Missing attribute inference cases
This email is just to summarize a bit of digging I did last night into
our attribute inference. Unfortunately, I'm not going to have time to
implement any of the gaps I noticed, but I figured someone else out
there might be interested.
*Missing Attributes*
argmemonly - influences AA, particularly relevant for libraries which
wrap build in functions which are annotated, but don't
2018 Feb 16
2
Missing attribute inference cases
Maybe we could list some of these as a GSoC project?
Seems like a self-contained task that can be simple as desired and as hard
as the student wants it to be.
Nuno
-----Original Message-----
From: Philip Reames via llvm-dev
Sent: Friday, February 16, 2018 6:48 PM
To: llvm-dev
Subject: Re: [llvm-dev] Missing attribute inference cases
On 02/16/2018 10:29 AM, Philip Reames via llvm-dev wrote:
2018 Feb 17
2
Missing attribute inference cases
Sure, but is anyone willing to mentor? I don't have time. I can
advise, but only infrequently.
Philip
On 02/16/2018 03:47 PM, Davide Italiano wrote:
> Yes, I agree with you this sounds like a great GSoC.
>
> On Fri, Feb 16, 2018 at 3:42 PM, Nuno Lopes via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> Maybe we could list some of these as a GSoC project?