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This is of course not homework. I am trying to understand how fast math optimizations work in llvm. When I compared IR for both the programs, the only thing I have noticed is that fdiv and fmul are replaced with fdiv fast and fmul fast. Not sure what happens in fdiv fast and fmul fast. I feel that its because d/max is really small number and fast-math does not care about small numbers and consider

Do you pull clang under llvm/tools and compile it as well? In theory, if `opt` recognize the option, so does `clang -mllvm`. 2018-01-12 8:47 GMT+08:00 sangeeta chowdhary <sangitachowdhary at gmail.com>: > Hello, > > I have tried giving this option like this > > clang -c -emit-llvm -mllvm -rdetector hello.c -c -o hello.bc > but I am getting error " Unknown command

I am sorry to not make my question clear. My question is how this value is calculated without having fadd and fsub in IR? On Sat, Aug 11, 2018 at 4:06 PM, Craig Topper <craig.topper at gmail.com> wrote: > Neither 1e16 or 1e16+1 can be accurately represented in a double. The > largest integer than be accurately represented is 2^53. As the number gets > larger floating sacrifices

Hello, I have followed steps given in - https://stackoverflow.com/questions/29910051/integrating-llvm-passes/48142693#48142693 <https://stackoverflow.com/questions/29910051/integrating-llvm-passes/48142693#48142693>, to integrate my pass with pass manager and run it with clang. I am able to run my pass with opt - opt -mypass but when I try to run it with clang, I always get an error -

(though, usual caveat: you /usually/ shouldn't be doing that - instead relying only on whatever semantics the IR actually carries, rather than implying extra semantics based on the demangled name) On Wed, Jun 24, 2020 at 12:48 PM Johannes Doerfert via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > I have not tried it but maybe > > `std::string llvm::demangle(const

Hi, I have below code in C - int main() { double x,y; x = 1e16; y = (x + 1) - x; printf("y:%e\n", y); return 0; } llvm bitcode looks like this for this function - ; Function Attrs: nounwind uwtable define dso_local i32 @main() local_unnamed_addr #0 { entry: %call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64

Hello, LLVM IR flattens out the structure with one integer element to i32. Is there any way to disable this? I want to preserve the type information of the structure. I tried compiling the program with O0, it maintains the type for most of the instructions but for all. Regards, Sangeeta -------------- next part -------------- An HTML attachment was scrubbed... URL:

On 14 Jan 2018, at 00:14, sangeeta chowdhary <sangitachowdhary at gmail.com> wrote: > > I have taken SimplePass and added in Transform directory, “libLLVMSimplePass.a” is built but I can not see this pass in opt —help. I don’t even see the name of pass while registering it in the example. The SimplePass example is intended to be built out of tree, so I’ve no idea what happens if you

Hello, I am doing some program analysis with C++ programs. I need to check if some particular function is called in the program, for that I need the name of the function being called in the call instruction. Since C++ mangles the name of the function, I need a way to demangle the function name in llvm IR. Is there any way to achieve that in llvm pass? Regards, Sangeeta -------------- next part

I have taken SimplePass and added in Transform directory, “libLLVMSimplePass.a” is built but I can not see this pass in opt —help. I don’t even see the name of pass while registering it in the example. > On Jan 13, 2018, at 7:35 AM, David Chisnall <David.Chisnall at cl.cam.ac.uk> wrote: > > On 13 Jan 2018, at 03:45, Craig Topper via llvm-dev <llvm-dev at lists.llvm.org>

Clang doesn’t support adding passes from the command line the way opt does. Opt has special parsing in opt.cpp for this that clang doesn’t have. I’m not sure what the correct way to do this is. I think your plugin needs to do something to tell clang/llvm when to run the pass. I’ll try to look later when I’m back at a computer. On Fri, Jan 12, 2018 at 7:00 PM 陳韋任 via llvm-dev <llvm-dev at

Hello, I am working on creating a llvm pass which clones a certain function with a different name using CloneFunctionInto. I create a call instruction to call a new cloned function from the old function. In llvm IR and in .s file everything looks as expected, but when I call this program with gdb and set a breakpoint on this new function, gdb shows the name of the original function. I know it has

Hello All, I am instrumenting IR to pass addres of the function to runtime but I am getting error - Instruction does not dominate all uses. I used M.dump() to get below dump, not able to figure out what I am doing wrong. Any help would be much appreciated. define dso_local double @mysqrt(double %val1) local_unnamed_addr #0 { entry: %0 = bitcast double (double)* @mysqrt to i8* %1 = call

I am using Opus in a mobile VoIP client. I don?t intend to deliver audio beyond wide band but want to ensure the best possible quality even at low bandwidths and high packet loss rates. I am trying to feed RTCP information to opus, that is set its bit-rate and expected packet loss periodically. 1) Any suggestions on how often I should change the bit-rate and expected packet loss, (maybe

I have this: class htb 1:29 parent 1:1 prio 0 rate 3000bit ceil 100000bit burst 1599b cburst 1611b Sent 33233 bytes 772 pkts (dropped 0, overlimits 0) lended: 415 borrowed: 357 giants: 0 tokens: -3756376 ctokens: 128779 or this: class htb 1:21 parent 1:1 prio 0 rate 3000bit ceil 100000bit burst 1599b cburst 1611b Sent 57554 bytes 618 pkts (dropped 0, overlimits 0) lended: 193 borrowed: 425

`-mypass` should be only recognize by the backend part (i.e. llvm). You should add `-mllvm` to tell clang the following argument have to be passed to the backend part. 2018-01-08 8:02 GMT+08:00 sangeeta chowdhary via llvm-dev < llvm-dev at lists.llvm.org>: > Hello, > > I have followed steps given in - https://stackoverflow.com/ >

Hello, I am trying to create a call to a function which returns a struct in llvm pass. I also want to read struct fields returned from this function call. Can somebody help me with this? Regards, Sangeeta

On 13/05/14 01:36 AM, Amit Chowdhary wrote: > 1) Any suggestions on how often I should change the bit-rate and > expected packet loss, (maybe even lower the audio bandwidth if the > bit-rate available is below the sweet-spot for WB)? > > 2) How is the codec's performance affected every time a control parameter > such as bit-rate or audio bandwidth is changed? > Would

Why the output is different for this below program when compiled using clang with fast-math optimization #include<stdio.h> int main() { double d = 1.0; double max = 1.79769e+308; d /= max; printf("d:%e:\n", d); d *= max; printf("d:%e:\n", d); return 0; } prints 0 with fast math but 1 without fast math. -------------- next part -------------- An

hey guys i am regulating the traffic to & fro by my network through a linux gateway , its behaving strange. i regulated Downlink to 2Mbps & UPlLINK to 500Kbps. both perform well when those are done independent i.e. one at a time but when i do both from a client system ..the downlink however continues at 2mbps but the uplink falls down to 100kbps? is something wrong with my script or