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Hello everyone, The particular motivation for this e-mail is my desire for feedback on how to fix PR17758; but there is a core design issue here, so I'd like a wide audience. The underlying issue is that, because the semantics of llvm.sqrt are purposefully defined to be different from libm sqrt (unlike all of the other llvm.<libm function> intrinsics) (*), and because autovectorization

Hi Hal, all. I'm not sure why llvm.sqrt is 'special'. Maybe because there is a SSE packed sqrt instruction (SQRTPS) but not e.g. a packed sin instruction AFAIK. As mentioned in a recent mail to this list, I would like llvm.sqrt to be defined as NaN for argument x < 0. I believe this would bring it more into line with the other intrinsics, and with the libm result, which is

>>> I'd like to emphasise in the latter one: "This option also relaxes the precision of >>> commonly used math functions." >> >> Isn't this the "libm" flag that is proposed in this thread? > > I don't know. I didn't see any definition of it. > > In my case I'm talking about allowing the use of lower precision but

On Mon, Nov 9, 2020 at 9:39 AM Alexandre Bique <bique.alexandre at gmail.com> wrote: > > Hi, > > So I managed to install llvm 11 on the server and got more information > thank to your help: > > Projects/Podolski/CMakeFiles/Podolski.dir/__/__/AudioModulesFrame/AM_WavLoader.cpp.o: > reference to exp >

No. A shared object is needed if it is linked in (1)--no-as-needed mode or (2) after --gc-sections, a symbol referenced by a live input section is defined by the shared object. You'll need to check whether a symbol is defined by libmvec.so.1 On Mon, Nov 9, 2020 at 9:57 AM Alexandre Bique <bique.alexandre at gmail.com> wrote: > > On Mon, Nov 9, 2020 at 6:52 PM Fāng-ruì Sòng

> It might be clearer, instead of using 'libm', to use something like 'trans' (for transcendental functions). That does seem clearer. ‘trans’ is definitely good with me. -Warren From: Hal Finkel [mailto:hfinkel at anl.gov] Sent: Tuesday, October 3, 2017 5:13 PM To: Ristow, Warren; Bruce Hoult Cc: llvm-dev at lists.llvm.org Subject: Re: [llvm-dev] Trouble when suppressing a

Hello, On some systems (Linux/glibc, for example), some libm math functions (like cos(double)) might set errno. It is important that we model this, in general, to prevent miscompilation (we would not, for example, want to reorder a call to cos in between a call to open and a call to perror). However, almost no code in the wild checks errno after calls to libm math functions, and this

----- Original Message ----- > Hi Hal, all. > > I'm not sure why llvm.sqrt is 'special'. Maybe because there is a > SSE > packed sqrt instruction (SQRTPS) but not e.g. a packed sin > instruction > AFAIK. This seems relevant: http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-August/010248.html Chris, et al., does the decision on how to treat sqrt predate our

----- Original Message ----- > From: "Renato Golin" <renato.golin at linaro.org> > To: "Hal Finkel" <hfinkel at anl.gov> > Cc: "LLVM" <llvmdev at cs.uiuc.edu> > Sent: Saturday, November 23, 2013 10:53:09 AM > Subject: Re: [LLVMdev] [RFC] Identifying access to errno > > > > > On 23 November 2013 14:14, Hal Finkel <

On 23 November 2013 14:14, Hal Finkel <hfinkel at anl.gov> wrote: > On some systems (Linux/glibc, for example), some libm math functions (like > cos(double)) might set errno. It is important that we model this, in > general, to prevent miscompilation (we would not, for example, want to > reorder a call to cos in between a call to open and a call to perror). > However, almost

----- Original Message ----- > > On Nov 11, 2013, at 9:30 PM, Hal Finkel <hfinkel at anl.gov> wrote: > > > ----- Original Message ----- > >> Hi Hal, all. > >> > >> I'm not sure why llvm.sqrt is 'special'. Maybe because there is a > >> SSE > >> packed sqrt instruction (SQRTPS) but not e.g. a packed sin > >>

I'm trying to figure out exactly how the intrinsics/libc/libm work in llvm. For example, this code return user defined function: float acos(float x, float y) { return x+y; } float a; void foo(float b, float c) { a = acos(b, c); } But this code returns llvm.intrinsic: float acos(float, float); float a; void foo(float b, float c) { a = acos(b, c); } float acos(float x, float y) {

Oh, and I forgot a third "_doserrno" for which no amount of documentation lends itself to a consistent description of its behavior. On Sat, Nov 23, 2013 at 12:28 PM, David Majnemer <david.majnemer at gmail.com>wrote: > On Sat, Nov 23, 2013 at 9:59 AM, Hal Finkel <hfinkel at anl.gov> wrote: > >> ----- Original Message ----- >> > From: "Renato

Hi all l'm new linux and wine user and wanted to use wine several times but everytime l've had some problems.This time l wanted to install wine from rpm but some libraries is needed by wine l think that l have them but wine isn't working well my system is RedHat 7.1 on an i686 kernel 2-4-2.2 wine need tose l have them those path library folder ld-linux.so.2

On Sat, Nov 23, 2013 at 9:59 AM, Hal Finkel <hfinkel at anl.gov> wrote: > ----- Original Message ----- > > From: "Renato Golin" <renato.golin at linaro.org> > > To: "Hal Finkel" <hfinkel at anl.gov> > > Cc: "LLVM" <llvmdev at cs.uiuc.edu> > > Sent: Saturday, November 23, 2013 10:53:09 AM > > Subject: Re:

Hi, I am trying to use the R/C interface on a Unix system that unfortunately does not have the gnu C compiler and am having trouble accessing the math functions from math.h. To compile a C program with math functions on this system, the following command is used (and the order is important: the /usr/lib/libm.a statement must come at the end of the command): "cc program.c

Dear community, Recently I discovered that llvm gold linker plugin (LLVMgold.so) doesn't add llvm instrinsics symbols to the linker symbol table. I do not claim that something is necessary wrong, just want to share my observations with the community. Brief summary If I create a static library with a custom version of 'exp()' math function and link it as follows: $

Thank you very much for your help Fāng-ruì Sòng. I've tried various things like linking directly to libm-2.32 but it didn't work, it seems that libm-2.32 still pulls libmvec. I have the following linker flags: CLANG_LDFLAGS="-fuse-ld=lld -static-libstdc++ -static-libgcc -fvisibility=hidden -fdata-sections -ffunction-sections" CLANG_LDFLAGS="$CLANG_LDFLAGS

On Wed, Oct 28, 2020 at 6:07 PM Fangrui Song <maskray at google.com> wrote: > > On 2020-10-28, Alexandre Bique via llvm-dev wrote: > >Hi, > > > >I wonder what is the right way to target an old glibc? > > > >I have a machine which is up to date (glibc 2.32 and clang+lld 10.0.1). > > > >So far I've been able to target older glibc by having a

----- Original Message ----- > From: "David Majnemer" <david.majnemer at gmail.com> > To: "Hal Finkel" <hfinkel at anl.gov> > Cc: "Renato Golin" <renato.golin at linaro.org>, "LLVM" <llvmdev at cs.uiuc.edu> > Sent: Saturday, November 23, 2013 2:37:52 PM > Subject: Re: [LLVMdev] [RFC] Identifying access to errno >