similar to: [LLVMdev] Why extra 4 bytes on stack ???

On Thu, Feb 2, 2012 at 12:25 PM, Umesh Kalappa <umesh.kalappa0 at gmail.com> wrote: > Hi There , > > Again ,I'm newbie to LLVM  and please pardon me ..if you guys  feel that > ,the below question is very basic :) > > Here i go ,compiled the below sample with clang i.e clang enum.c -S > -emit-llvm and there respective file are > > $ cat enum.c > int main()

Hi Duncan, Appreciate you response here and yeah any optimization switch for clang will make this extra bytes go away ...Was very curious to know why these extra bytes for and can you please elaborate more on "for storing the return value in more complicated cases" ...That helps me understand the LLVM internals :) Thanks ~Umesh On Thu, Feb 2, 2012 at 2:19 PM, Duncan Sands

Hi Umesh, The compiler generates an alloca (stack space) for every local variable defined in a function. Along with local variables this also includes space to store the function parameters and also the variable that holds the return value. For example: Int x(int a, int b) { Return a + b; } Would compile to something like this: Define i32 @x(i32 %a, i32 %b) { %ret.addr = alloca i32

Is there any reason this generated code won't run in the Jit? I've pretty much got everything else working for my front end which all runs fin in the Jit but I can't get global arrays to work. ; ModuleID = 'test' target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" target triple

Hi There , Again ,I'm newbie to LLVM and please pardon me ..if you guys feel that ,the below question is very basic :) Here i go ,compiled the below sample with clang i.e *clang enum.c -S -emit-llvm* and there respective file are $ cat enum.c int main() { enum type{one=1,two,three} s; s = one; return s; } $ cat enum.s ; ModuleID = 'enum.c' target datalayout =

Try using i64 indices with GEP > Is there any reason this generated code won't run in the Jit? > I've pretty much got everything else working for my front end > which all runs fin in the Jit but I can't get global arrays to work. > > ; ModuleID = 'test' > target datalayout = >

In the creation of dynamic languages we often have to box values together. For instance, take the following expression: IntObj c = sqrt((a*a)+(b*b)); Here, most likely, a bytecode interpreter would execute this as "mul_ints", "add_ints", "sqrt", etc. Inside these primitive functions we would have to unwrap our IntObj types, add the values, allocate a new object and

Hi Andrea, That is because the LR is the fixed register as per the http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf and out_char() function is not the leaf function ,Hence compiler tends to save and restore the LR and the save and restore of register r11 is to align stack for 8 bytes as per ARM EABI. Thanks ~Umesh On Tuesday, October 15, 2013, Umesh Kalappa

Hi! When I allocate memory for a structure, in _Znwm (operator new) function I need to specify size. How can I determine this information dynamically? ; ModuleID = '/tmp/webcompile/_12211_0.bc' target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" target triple =

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 =

Hi Umesh, > Again ,I'm newbie to LLVM and please pardon me ..if you guys feel that ,the > below question is very basic :) > > Here i go ,compiled the below sample with clang i.e *clang enum.c -S -emit-llvm* > and there respective file are > > $ cat enum.c > int main() > { > enum type{one=1,two,three} s; > s = one; > return s; > } > > $ cat

Dear all, I'm currently working on the automated program analysis tool AProVE (http://aprove.informatik.rwth-aachen.de/) and would like to use LLVM for analysis of C programs. I have the following example C program dealing with simple lists of integers: ------------ start C example ------------- #include<stdlib.h> struct list_el { int val; struct list_el * next; }; typedef

Hi all, I'm looking at following code snippet: void t2(double *x) { long long a[2]; a[0] = 3; a[1] = 5; *x = * ((double *) a); *(x+1) = * ((double *) &a[a[0]-2]); } I use generate LLVM code using my own front-end that looks like: ; ModuleID = 'jb.c' target datalayout =

So I was taking a look at Microsoft C++ ABI support while on vacation, and ran into a major issue. Given the following llvm-ir: $ clang++ -S -emit-llvm -O3 mangling.cpp -o - -Xclang -cxx-abi -Xclang microsoft ; ModuleID = 'mangling.cpp' target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-

In the case I posted I had removed that line, however, you still get the __3F_ in the generated assembly with it. Sent from my iPhone On Nov 25, 2011, at 2:15 PM, Charles Davis <cdavis at mymail.mines.edu> wrote: > > On Nov 25, 2011, at 8:39 AM, Michael Spencer wrote: > >> So I was taking a look at Microsoft C++ ABI support while on vacation, >> and ran into a major

Hi All , We are in process of exploring the LTO and found that internalize pass is the replacement for whole program optimisation (-fwhole-program in gcc) in clang and in the below case define i32 @test() #0 { entry: ret i32 0 } define i32 @main() #0 { entry: %retval = alloca i32, align 4 store i32 0, i32* %retval, align 4 %call = call i32 @test() ret i32 %call } ***

On Mar 15, 2013, at 3:08 PM, James Courtier-Dutton <james.dutton at gmail.com> wrote: > 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

Hi Dan and Others , I'm newbie to LLVM and Clang ,But has experience on compiler optimization and VM . Everyone talking about the LLVM in my organisation so thought of peeking into it and where this discussion is stalled me ... so i tried to simulate the problem ,which is discussed here . vi sample.c double f(double** p ) { double a,b,c; double * x = &a; double * y =

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 returns 12, and %var2 = 12. > ; ModuleID = 't.c' > target datalayout = >

Hi Justin , Thank you for the confirmation and we would like to know that ,going forward the clang has the support the gcc gcov format or use the -fprofile-instr-generate -fcoverage-mapping and get ride of gcov format . We are planing to customize the clang code coverage for embedded world ,before we start tweaking the gcov / -fprofile-instr-generate code-base ,we would like to take feedback