similar to: [LLVMdev] Multiply i8 operands promotes to i32

On Mon, Oct 8, 2012 at 2:44 AM, Pedro Malagón <malagon at die.upm.es> wrote: > Hi, > > I am trying to complete the hardware multiplier option for MSP430 backend. > > As the hardware multiplier in most of the MSP430 devices is for i8 and > i16 operands, with i16 and i32 result, I am lowering MUL_i8 and MUL_I16. > However, the front-end promotes the i8 argument to i32,

> At -O0, you don't. __mulsi3 is the obvious lowering, and you're doing > something wrong if your tools don't provide it. MSP430 is 16 bit target, so mulsi is a bit expensive there, mulhi / mulqi can be implemented via hardware multiplier. There are several problems wrt 16 bit support inside LLVM in general and msp430 in particular: 1. In some places LLVM expectes 32 bit or 64

Looks like I have run into the same issue reported in: https://bugs.llvm.org/show_bug.cgi?id=20871 Is there a fix or work-around for it? The bug report seems to be still open. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20171005/46c1282d/attachment.html>

My two-address target machine has sign-extension instructions to extend i8->i32 and i16->i32. When I compile this simple program: int sext (unsigned a, unsigned b, int c) { return (signed char) a + (signed short) b + c; } I get this IR: define i32 @sext(i32 %a, i32 %b, i32 %c) nounwind readnone { entry: %conv = trunc i32 %a to i8 ; <i8>

I'm building tool-chain for processor without integer MUL. So, I've defined __mulsi3 for integer multiplication (int32). Now I've got a problem with int64 multiplication which is implemented in libgcc2.c. Segfualt due to infinite recursion in i64 soft multiplication (libgcc2, __muldi3). LLVM-GCC (for my target) misoptimizes code if -O2 is passed. It promotes i32 multiplication to

> This shouldn't be necessary, IMO. If you were going to implement it, > then the correct thing to do would be to have generic selection dag > lowering of large multiplies, which renders the library mostly > useless. In fact, I would prefer to avoid custom lowering for operations on large types. i64 will be rare in my case (embedded) and their performance is not an issue. I need

On Wed, Mar 17, 2010 at 4:57 PM, Sergey Yakoushkin <sergey.yakoushkin at gmail.com> wrote: > Thanks, yes, I'm facing the same issue. > > Hm... seems there are no simple fixes. > I have to do one more i64 mul implementation to workaround aggressive > optimizations. > Is that correct? Is this the only way? This shouldn't be necessary, IMO. If you were going to

On Wed, Mar 17, 2010 at 1:32 PM, Sergey Yakoushkin <sergey.yakoushkin at gmail.com> wrote: > I'm building tool-chain for processor without integer MUL. > So, I've defined __mulsi3 for integer multiplication (int32). > > Now I've got a problem with int64 multiplication which is implemented > in libgcc2.c. > Segfualt due to infinite recursion in i64 soft

Hello Pedro, As others have said we're assuming that you're using Clang as the frontend, the MSP430TargetInfo class inside lib/Basic/Targets.cpp (clang codebase) set ints to be 16 bits wide, so you should get 16bit mults straight away without promotion. But anyways for 8bit multiplicantions you can do the following to bypass argument promotion: 1) go to the lib/CodeGen/TargetInfo.cpp

On Thu, Sep 08, 2011 at 11:15:06AM -0500, Villmow, Micah wrote: > Peter, > Is there a way to make this flag globally available? Metadata can be fairly expensive to handle at each node when in many cases it is a global flag and not a per operation flag. There are two main reasons why I think we shouldn't go for global flags: 1) It becomes difficult if not impossible to correctly link

Hi all, I have been looking at the way LLVM optimizes code before forwarding it to the backend I develop for my company and while building define i32 @test_extract_subreg_func(i32 %x, i32 %y) #0 { entry: %conv = zext i32 %x to i64 %conv1 = zext i32 %y to i64 %mul = mul nuw i64 %conv1, %conv %shr = lshr i64 %mul, 32 %xor = xor i64 %shr, %mul %conv2 = trunc i64 %xor to i32

Since Clang does not seem to allow type casts, such as uchar4 to float4, between vector types, it seems it is necessary to write them as element by element conversions, such as typedef float float4 __attribute__((ext_vector_type(4))); typedef unsigned char uchar4 __attribute__((ext_vector_type(4))); float4 to_float4(uchar4 in) { float4 out = {in.x, in.y, in.z, in.w}; return out; } Running

I think this is broken in at least one place when legalising the DAG. This llvm ir: %3 = call { i16, i1 } @llvm.umul.with.overflow.i16(i16 %2, i16 11) Fails to lower correctly on AVR but the problem is, unfortunately, not just coming from the AVR Target code and I am not sure it can be cleanly fixed just there. (But I would be very happy to be proved wrong as I'm very new to this.) The above

ssh won't compile on this platform log: gcc -g -O2 -Wall -I/usr/local/ssl/include -DETCDIR=\"/usr/local/etc\" -DSSH_PROGRAM=\"/usr/local/bin/ssh\" -DSSH_ASKPASS_DEFAULT=\"/usr/local/libexec/ssh/ssh-askpass\" -DHAVE_CONFIG_H -c atomicio.c -o atomicio.o In file included from config.h:294, from bsd-misc.h:39, from includes.h:91,

configure appears to be setting things right: dragon:/var/src/openssh-1.2.1pre23> grep INTXX config.h #define HAVE_INTXX_T 1 /* #undef HAVE_U_INTXX_T */ #define HAVE_UINTXX_T 1 Marc G. Fournier marc.fournier at acadiau.ca Senior Systems Administrator Acadia University "These are my opinions, which are not necessarily shared

Peter, Is there a way to make this flag globally available? Metadata can be fairly expensive to handle at each node when in many cases it is a global flag and not a per operation flag. > -----Original Message----- > From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] > On Behalf Of Robert Quill > Sent: Thursday, September 08, 2011 3:24 AM > To: Peter

Hi Sanjay, thank you a lot for your answer. I understand that in your examples it is desirable that `foo` and `goo` are canonicalized to the same IR, i.e., something like `@goo`. However, I still have a few open questions, but please correct me in case I'm thinking in the wrong direction. > Am 21.07.2016 um 18:51 schrieb Sanjay Patel <spatel at rotateright.com>: > > I've

https://bugs.freedesktop.org/show_bug.cgi?id=27680 Summary: Misaligned reg ... nVidia Corporation C67 [GeForce 7150M / nForce 630M] (rev a2) Product: xorg Version: git Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: major Priority: medium Component: Driver/nouveau

Hello all, I want to create a program that runs from a pxe-loaded virtual floppy (using memdisk + keeppxe) to call again PXE boot. I took a piece of code form NILO to look for PXE data structures and the call to function PXENV_START_BASE from PXE spec as follows: lower = (unsigned char *)LOWER_PXE_MEM; upper = (unsigned char *)UPPER_PXE_MEM; for (i=upper; i>lower;i--) { if

Hi people. I use centos on many my servers and they are running samba which comes with centos: samba-3.0.10-1.4E.9 From samba-3.0.10 to 3.0.23c many thnigs in code had change. Many bug fixes etc., code rewrote (for example oplock in later version of samba than 3.0.10). RedHat people don't have made a full of backports to their samba, only security things. So I have question, what do