Displaying 20 results from an estimated 11888 matches for "aligned".
2007 Apr 01
4
[LLVMdev] PR400 - alignment for LD/ST
...e. If the alignment value is nonzero then the
> alignment value should be used over the natural or preferred alignment.
Yes, exactly. To put this another way: if the specified alignment is less
than the natural alignment for the type, then the codegen needs to be
careful (e.g. use special unaligned loads). If it is more aligned, then
this is a guarantee to clients about the load, who can choose to use it or
not. If the specified alignment matches the natural alignment, then it
can be dropped (set to zero).
-Chris
--
http://nondot.org/sabre/
http://llvm.org/
2015 May 11
2
[LLVMdev] How to Store variable allocation in Registers
Hi Bruce!!
Im using "C" language.
As you said...,i tried using Global pointer..,but i still am not able to
get the Registers exactly as i wanted.
I found "-mem2reg" as a better alternative. But Problem is even though the
resulting Intermediate file( .ll ) is
good...,the final assembly file( .s) file is making a lot of DCE.
Im Posting an example :
*Original Intermediate
2015 Mar 03
2
[LLVMdev] Need a clue to improve the optimization of some C code
Hi
I have some inline function C code, that llvm could be optimizing better.
Since I am new to this, I wonder if someone could give me a few pointers, how to approach this in LLVM.
Should I try to change the IR code -somehow- to get the code generator to generate better code, or should I rather go to the code generator and try to add an optimization pass ?
Thanks for any feedback.
Ciao
2018 Mar 06
0
Sieve filter doesn't respect mailbox separator
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
2013 Oct 28
2
[LLVMdev] loop vectorizer says Bad stride
Verifying function
running passes ...
LV: Checking a loop in "bar"
LV: Found a loop: L0
LV: Found an induction variable.
LV: We need to do 0 pointer comparisons.
LV: Checking memory dependencies
LV: Bad stride - Not an AddRecExpr pointer %13 = getelementptr float*
%arg2, i32 %1 SCEV: ((4 * (sext i32 {(256 + %arg0),+,1}<nw><%L0> to
i64)) + %arg2)
LV: Src Scev: {((4 * (sext
2007 Nov 07
7
[LLVMdev] RFC: llvm-convert.cpp Patch
Hi all,
This patch is to fix a problem on PPC64 where an unaligned memcpy is
generated. The testcase is this:
$ cat testcase.c
void Qux() {
char Bar[11] = {0};
}
What happens is that we produce LLVM code like this:
call void @llvm.memcpy.i64( i8* %event_list2, i8* getelementptr ([11
x i8]* @C.103.30698, i32 0, i32 0), i64 11, i32 8 )
Notice that it has an 8...
2016 Feb 09
2
Modified LLVM IR
Hi,
I want to edit LLVM generated IR file, like as given below,
Original LLVM IR file,
@.str2 = private unnamed_addr constant [17 x i8] c"\0AI am in
one_11\0A\00", align 1
; Function Attrs: nounwind
define i32 @one_1(i32 %ivar1, i32 %ivar2) #0 {
entry:
%ivar1.addr = alloca i32, align 4
%ivar2.addr = alloca i32, align 4
%isum = alloca i32, align 4
store i32 %ivar1, i32*
2007 Apr 02
2
[LLVMdev] PR400 - alignment for LD/ST
...gnment model, I'd suggest going for representing
alignments as "offset from alignment".
In this model, you represent each alignment value as a pair <align,offs>,
where offs is always less than align. This allows you to say that "this
load is 2 bytes away from a 16-byte aligned pointer" for example.
-Chris
--
http://nondot.org/sabre/
http://llvm.org/
2013 Nov 11
2
[LLVMdev] What's the Alias Analysis does clang use ?
Hi, LLVM community:
I found basicaa seems not to tell must-not-alias for __restrict__ arguments
in c/c++. It only compares two pointers and the underlying objects they
point to. I wonder how clang does alias analysis
for c/c++ keyword restrict.
let assume we compile the following code:
$cat myalias.cc
float foo(float * __restrict__ v0, float * __restrict__ v1, float *
__restrict__ v2, float *
2020 Apr 17
1
Any advice for installing Samba as an AD server on Raspbian Buster with BIND9 and ISC DHCP?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
2011 Feb 14
1
[LLVMdev] broken alignment in stack(caused by bug in SelectionDAGBuilder) causes invalid schedules with r125471 and newer
...ywhere with alignment of stack alignment (4 in our case)
SelectionDAGBuilder however calls CreateStackObject with preferred alignment is given data type(8 in our problemaric case. The ABI alignment for this data type is only 4)
This means, that the MachineFrameInfo thinks that the stack object is aligned by 8 bytes, even though in reality if may also be aligned only by 4 bytes, of the SP points to address which is aligned by 4, but not 8.
r125471 introduced optimization which can optimize add into xor in case object is aligned so that the operation only touches the lowest bits, which were zero on...
2018 Mar 14
3
Sieve not working.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8"/>
2013 Oct 28
0
[LLVMdev] loop vectorizer says Bad stride
Frank,
It looks like the loop vectorizer is unable to tell that the two stores in your code never overlap. This is probably because of the sign-extend in your code. Can you extend the indices to 64bit ?
Thanks,
Nadav
On Oct 28, 2013, at 1:38 PM, Frank Winter <fwinter at jlab.org> wrote:
> Verifying function
> running passes ...
> LV: Checking a loop in "bar"
> LV:
2013 Nov 12
0
[LLVMdev] What's the Alias Analysis does clang use ?
Hi,
Your problem is that the function arguments, which are makes as noalias, are not being directly used as the base objects of the array accesses:
> %v0.addr = alloca float*, align 8
> %v1.addr = alloca float*, align 8
> %v2.addr = alloca float*, align 8
> %t.addr = alloca float*, align 8
...
> store float* %v0, float** %v0.addr, align 8
> store float* %v1, float** %v1.addr,
2013 Feb 14
1
[LLVMdev] LiveIntervals analysis problem
Hello everyone,
please I need your help.
To reproduce my problem I created simple pass for backends (TestPass.cpp
in attached files). That pass I call from Mips backend in this way
(MipsTargetMachine.cpp):
bool MipsPassConfig::addPreRegAlloc() {
addPass(createTestPass());
return false;
}
The problem becomes, when I am trying compile file ldtoa.ll (in attached
files). Compiling
2007 Nov 07
0
[LLVMdev] RFC: llvm-convert.cpp Patch
On Nov 6, 2007, at 5:45 PM, Bill Wendling wrote:
> Hi all,
>
> This patch is to fix a problem on PPC64 where an unaligned memcpy is
> generated. The testcase is this:
>
> $ cat testcase.c
> void Qux() {
> char Bar[11] = {0};
> }
>
> What happens is that we produce LLVM code like this:
>
> call void @llvm.memcpy.i64( i8* %event_list2, i8* getelementptr ([11
> x i8]* @C.103.30698, i32...
2007 Apr 02
0
[LLVMdev] PR400 - alignment for LD/ST
...hen the
>> alignment value should be used over the natural or preferred
>> alignment.
>
> Yes, exactly. To put this another way: if the specified alignment
> is less
> than the natural alignment for the type, then the codegen needs to be
> careful (e.g. use special unaligned loads). If it is more aligned,
> then
> this is a guarantee to clients about the load, who can choose to
> use it or
> not. If the specified alignment matches the natural alignment,
> then it
> can be dropped (set to zero).
>
> -Chris
Here's a related question....
2012 Oct 28
2
[LLVMdev] Annotating known pointer alignment
...i64 %0, 3
>> ret i64 %and
>> }
>>
>> 1) How can clang deduce the alignment on the store?
>
> by consulting the C standard :)
Ah, good to know. ยง6.3.2.3 (7) even states that casting alone leads to
undefined behaviour, if the resulting pointer is not correctly aligned.
> It emits a store without
>> alignment information,
>
> I assume you mean: without an explicit alignment.
>
> and instcombine adds the explicit alignment according to
>> the langref (pref alignment).
>
> Without an explicit alignment means the ABI alignment i...
2016 Feb 10
2
Modified LLVM IR
Hi,
I want to call/add some functions(that defined in another file) on top of
some functions, and reflect the same changes in object file.
No, I am not looking for contractor.
Thanks,
Deepika
On Tue, Feb 9, 2016 at 7:04 PM, mats petersson <mats at planetcatfish.com>
wrote:
> What is the condition for adding this code?
>
> What have you tried so far? [Or are you looking for a
2018 Mar 02
2
Sieve filter doesn't respect mailbox separator
namespace separator is '.',
this sieve script incorrectly tries to put the mail inside a mailbox
rather that beside it, for example if the mailbox is named
'example', the mail will be put in the path 'example/.Spam'
instead of 'example.Spam'
require ["fileinto"];
if header :contains "X-Spam" "yes" {
? fileinto "Spam";
}
#