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The attached patch includes no test-case and isn't consistent with the rest of the file: - constants should be on the right hand side of comparisons - the braces around your single line 'if' aren't needed. On Sun, Sep 15, 2013 at 2:39 PM, James Courtier-Dutton < james.dutton at gmail.com> wrote: > I attach a patch that fixes this bug. Applies to llvm 3.4svn > > Please commit it please. > > Kind Regards > > James > > > > > On 13 September 2013 17:46, James Courtier-Dutton <james.dutton at gmail.com>w...

...gt; The attached patch includes no test-case and isn't consistent with the > rest of the file: > - constants should be on the right hand side of comparisons > - the braces around your single line 'if' aren't needed. > > > > On Sun, Sep 15, 2013 at 2:39 PM, James Courtier-Dutton < > james.dutton at gmail.com> wrote: > >> I attach a patch that fixes this bug. Applies to llvm 3.4svn >> >> Please commit it please. >> >> Kind Regards >> >> James >> >> >> >> >> On 13 September 2013 17:46,...

Hi, I am looking at the "LLVMOpInfoCallback GetOpInfo" callback. Example 1 GOOD: 41 c6 84 24 16 04 00 00 0c : movb $12, 1046(%r12) Makes calls to the callback with: Offset = 0x4, Size = 0x4 <- Octets: 16 04 00 00 Offset = 0x8, Size = 0x1 <- Octets: 0c That was correct. Example 2 BAD: c7 45 98 a1 ff ff ff : movl $4294967201, -104(%rbp) Makes calls to the callback

Hi, I think this is a very simple question, and it must just be missing something. I am looking for find out how to assign a constant integer value to the variable in llvm ir. The following returns 12, and %var2 = 12. ; ModuleID = 't.c' target datalayout =

On Mar 15, 2013 10:53 PM, "Óscar Fuentes" <ofv at wanadoo.es> wrote: > > James Courtier-Dutton <james.dutton at gmail.com> writes: > > > I think this is a very simple question, and it must just be missing something. > > > > I am looking for find out how to assign a constant integer value to > > the variable in llvm ir. > > > > The following...

On 7 May 2012 16:31, John Criswell <criswell at illinois.edu> wrote: > On 5/7/12 5:47 AM, James Courtier-Dutton wrote: >> >> Hi, >> >> I am writing a decompiler. I was wondering if some of LLVM could be >> used for a decompiler. >> There are several stages in the decompiler process. >> 1) Take binary and create a higher level representation of it. Like RTL. &g...

I attach a patch that fixes this bug. Applies to llvm 3.4svn Please commit it please. Kind Regards James On 13 September 2013 17:46, James Courtier-Dutton <james.dutton at gmail.com>wrote: > Hi, > > I am looking at the "LLVMOpInfoCallback GetOpInfo" callback. > > Example 1 GOOD: > 41 c6 84 24 16 04 00 00 0c : movb $12, 1046(%r12) > > Makes calls to the callback with: > Offset = 0x4, Size = 0x...

On Sun, Apr 16, 2017 at 2:34 AM James Courtier-Dutton via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Hi, > > Did this work ever get done? There was a long thread about it back in 2015. > > I wish to use IRBuilder. > Is there any documentation? > How do I use the singular pointer type in GEP, LOAD, STORE instruct...

On Mon, 6 May 2019 at 10:13, James Courtier-Dutton via llvm-dev <llvm-dev at lists.llvm.org> wrote: > Although the above is mentioning bytes, looking at the "/ 8" and "& 0x7" makes it look like the author meant octets and not bytes. > Bytes can be any size of bits. I don't think you'll have much...

> -----Original Message----- > On Behalf Of James Courtier-Dutton > To: John Criswell > > On 7 May 2012 16:31, John Criswell <criswell at illinois.edu> wrote: > > On 5/7/12 5:47 AM, James Courtier-Dutton wrote: > >> > >> Hi, > >> > >> I am writing a decompiler. I was wondering if some of LLVM could...

Hi, I know most compilers go from AST to CFG. I am writing a decompiler, so I was wondering if anyone knew of any documents describing how best to get from CFG to AST. The decompiler project is open source. https://github.com/jcdutton/libbeauty The decompiler already contains a disassembler and a virtual machine resulting in an annotated CFG. It uses information gained from using a virtual

On Mon, Oct 28, 2013 at 10:09 AM, James Courtier-Dutton <james.dutton at gmail.com> wrote: > My guess is that this is a missed optimization, but in real life, all > projects i have worked fix this in the C or C++ code using macros that > change what instructions are used based on target platform and its > endedness. One reason...

...one after a multiplication, which has to be loaded from the constant pool (extra memory access). So I wonder, is it possile to prevent it, via changes to the config of the base class TargetLowering，than writing special custom C++ code. Ben At 2020-06-30 07:46:41, "James Courtier-Dutton" <james.dutton at gmail.com> wrote: >Hi Ben, > >Why do you want to stop it? >"mul then add" is faster than "add then mul". >The result is the same in both cases. > >On Mon, 29 Jun 2020 at 22:11, Ben Shi via llvm-dev ><llvm-dev at list...

Hi, I am writing a decompiler. I was wondering if some of LLVM could be used for a decompiler. There are several stages in the decompiler process. 1) Take binary and create a higher level representation of it. Like RTL. 2) The output is then broken into blocks or nodes, each block ends in a CALL, JMP, RET, or 2-way or multiway conditional JMP. 3) The blocks or nodes are then analyzed for

Hi, I have the x86 SBB instruction. how should I represent this in LLVM IR. (as part of a decompiler from binary to LLVM IR) Pre-conditions: %eax = 0xffffffff %edx = 0xffffffff %carry = 1 SBB %eax, %edx // %edx is the destination doing %edx = %edx - (%eax + carry) JC jump_destination1 // If the Carry flag is set, jump to jump_destination1 How do I represent this correctly in LLVM

On 10/17/2012 2:11 PM, James Courtier-Dutton wrote: > > I thing to keep in mind is this is CFG, and can be unstructured, or > after various transformations, not representable in higher level > language structures such as while loops. Having a specific loop structure with specific requirements, such as single back edge can...

You can't. You have to use the value 12 directly. On 16 March 2013 00:18, James Courtier-Dutton <james.dutton at gmail.com>wrote: > > On Mar 15, 2013 10:53 PM, "Óscar Fuentes" <ofv at wanadoo.es> wrote: > > > > James Courtier-Dutton <james.dutton at gmail.com> writes: > > > > > I think this is a very simple question, and it...

Hi James, On 13/05/13 00:25, James Courtier-Dutton wrote: > Hi, > > I have the following program (attached) > > I produces, using the llvm-c API, this: > ; ModuleID = './llvm-test.bc' > > define i32 @test2() { > EntryBlock: > ret i32 3 > } > > But, I want it to produce this: > ; ModuleID =...

On 8 May 2018 at 16:34, James Courtier-Dutton via llvm-dev <llvm-dev at lists.llvm.org> wrote: > Has something changed? > So, it seams that LLVM do not participate in Outreachy. Last email from Tanya was looking for folks to participate, there was no update that it wouldn't happen. Maybe this is a new development? Anyw...

Hi, I see this in the Type class: unsigned getSubclassData() const { return SubclassData; } void setSubclassData(unsigned val) { SubclassData = val; // Ensure we don't have any accidental truncation. assert(getSubclassData() == val && "Subclass data too large for field"); } How will the assert ever get triggered? The type is "unsigned" so how can