similar to: [LLVMdev] how to use "new instruction()"

Thanks Jonathan. I knew this document. But I didn't understand the "unsigned iType, Use *Ops" fields. Could you please help how I can create a new instruction to do the example I was giving? Thanks for your time in advance. Best, Zhi On Thu, Apr 16, 2015 at 5:48 PM, Jonathan Roelofs <jonathan at codesourcery.com > wrote: > You're probably looking for this method: >

Does anyone know how to instrument *double* to <2 x doulbe>**, e.g., 2.2 --> <2.2, 2.2>? For example, I want to change the following IR code %arrayidx1 = getelementptr inbounds [100 x double]* @main.B, i32 0, i32 %i.021 %1 = load double* %arrayidx1, align 4, !tbaa !0 to: %arrayidx1 = getelementptr inbounds [100 x double]* @main.B, i32 0, i32 %i.021 %1 = bitcast double* %arrayidx1

So, you need to bitcast `pinst` to a pointer to Vector of double, since it (I hope for your sake) is a pointer to integer. What you are trying to do is bitcast a pointer into a vector, which probably will lead to an assert or "bad code that doesn't work". -- Mats On 15 April 2015 at 21:57, zhi chen <zchenhn at gmail.com> wrote: > What I want to do is to change the pInst

It seems that the problem was because I used builder.CreateFAdd to create a <2 x double> vectortype FADD instruction. It works if I use it to create the scalar version FADD. I want to have an instruction like: *%2 = fadd <2 x double> undef, <2 x double> undef. *The following is the way I used to create the vectorized FADD instruction: //pInst is a double type instruction

Does the insert point also mean inserting before the instruction? On Tue, Apr 21, 2015 at 3:36 PM, Daniel Berlin <dberlin at dberlin.org> wrote: > IRBuilder takes an insertion point. > Use it? > > > On Tue, Apr 21, 2015 at 3:17 PM, zhi chen <zchenhn at gmail.com> wrote: > > The current instruction is: > > > > Instruction *pInst; > > > >

The current instruction is: Instruction *pInst; How can I create a new instruction, say add, after pInst? Thanks, Zhi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150421/8f75a4a0/attachment.html>

I got it. Thanks, Nick. So, it is back to the previous problem. If I have the following instruction: %3 = fadd double %1, double %2 I want to change it into %6 = fadd <2 x double> %4, double %5 where %4 = <double %1, double %1>, %5 = <double %2, double %2>, how can I do this? Thanks, Best On Fri, Apr 17, 2015 at 1:56 AM, Nick Lewycky <nicholas at mxc.ca> wrote: >

Value * is the instruction. use dyn_cast<Instruction> to get to it. On Thu, Apr 16, 2015 at 11:39 PM zhi chen <zchenhn at gmail.com> wrote: > But IRBuilder.CreateXYZ only returns a "VALUE" type. Can I get the > instruction created by it? For example, > > IRBuilder<> builder(&*pinst); > Value *val = builder.CreateFAdd(LV, RV, ""); >

Thanks Nick, that's something what I am trying to implement as the following. But it seems I still only get the constant value not the instruction. Could you please go over the following instruction and see what wrong with it? Thanks for your time again. Value *vecVal = NULL; IRBuilder<> builder(&*pInst); Type *vecTy = VectorType::get(Type::getDoubleTy(ctxt), 2); Value

How can I write code to generate IR for: %2 = bitcast double* %1 to <2 x double>*. %3 = load <2 x double>* %2, align 16 Basically, it is similar to x86 _mm_load_pd1 intrinsics. Thanks, Zhi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150415/66489860/attachment.html>

Yes. That's what I was the solution in my mind. But I just wanted to know if there was a generic way to save some code... On Thu, Apr 16, 2015 at 8:32 PM, Tim Northover <t.p.northover at gmail.com> wrote: > > I understand that I can detect the operation first, and use "create" to > > create for each of them. But I don't if there is a generic way to do this

Thanks, Bruce. So, what is the easiest way to check if there is any bit set to 1 in a <N x i1> vector type? I used bitcast instruction to cast it into "iN" first and them compare iN to 0. Do you have a better way to do it? Thanks again. On Fri, Apr 10, 2015 at 5:22 PM, Bruce Hoult <bruce at hoult.org> wrote: > LLVM doesn't have a "logical neg" (or

Yes, but my point is that there would be some overhead to do cast the <N x i1> vectortype to an integerNty. Is there any good way to check not all of these N bits in the vectortype are 0s? On Fri, Apr 10, 2015 at 5:37 PM, Bruce Hoult <bruce at hoult.org> wrote: > Sure, if you actually just want an i1 saying whether or not at least one > bit is set to 1, then comparing against 0

I see. My CPU is a general Core i7 Ivy bridge CPU. On Fri, Apr 10, 2015 at 6:48 PM, Bruce Hoult <bruce at hoult.org> wrote: > I suppose that depends on your CPU. Do you even have a CPU that supports > operations on <N x i1> as packed bits in vector registers? > > > On Sat, Apr 11, 2015 at 12:43 PM, zhi chen <zchenhn at gmail.com> wrote: > >> Yes, but my

How can I generate LLVM IR for both logical NEG (!)? For example, if I have Int32Ty a, For the bitwise NEG(~): c = ~a ; I can use the following API from LLVM: BinaryOperator *neg = BinaryOperator::CreateNeg(nbits, "bitwiseNEG", insertBefore); How, if I want to generate logical NEG: c = !a; what should I do for this? Thanks -------------- next part -------------- An HTML

The patch below fixes the recent UML compilation failure in -rc5-mm1 without making the UML build reach further into the i386 headers. It splits the i386 ptrace.h and system.h into UML-usable and UML-unusable pieces. The string "abi" is in there because I did ptrace.h first, and that involves separating the ptrace ABI stuff from everything else (if pt_regs is not considered part of

The patch below fixes the recent UML compilation failure in -rc5-mm1 without making the UML build reach further into the i386 headers. It splits the i386 ptrace.h and system.h into UML-usable and UML-unusable pieces. The string "abi" is in there because I did ptrace.h first, and that involves separating the ptrace ABI stuff from everything else (if pt_regs is not considered part of

With CONFIG_PARAVIRT, the kernel .text is littered with a bunch of calls to pv_irq_ops function pointers, like: callq *0xffffffff81e3a400 (pv_irq_ops.save_fl) In non-Xen paravirt environments -- including native, KVM, Hyper-V, and VMware -- the above code gets patched by native_patch() to look like this instead: pushfq pop %rax nopl 0x0(%rax,%rax,1) So in most scenarios,

Thanks, Tim. What I want to do is to change the scalar instructions to scalar ones. For example, if I have to the following one: %3 = fadd double %1, double %2 I want to change it into %6 = fadd <2 x double> %4, double %2. I understand that I can detect the operation first, and use "create" to create for each of them. But I don't if there is a generic way to do this because

Jon, > You want: > TaintVar->insertAfter(FirstI); This worked! Thank you. On Thu, Aug 25, 2016 at 9:38 AM, Jonathan Roelofs <jonathan at codesourcery.com> wrote: > > > On 8/25/16 7:01 AM, Shehbaz Jaffer via llvm-dev wrote: >> >> I tried an alternative way of adding instruction by first getting the >> first instruction of the basic block, and then