> On Feb 14, 2017, at 22:27, Subhendu Malakar <subhendu.m...@gmail.com> wrote:
>
> Thanks for the reply.
>
> Indeed, I was not building "clang" from source. I'm going to build it now.
>
> Just curious to know if it is possible to negate the option
> "discard-value-names" like "no-discard-value-names", etc. such that I don't
> have to copy paste the whole thing again and again. Couldn't find any such
> option in "clang -cc1 --help".
No, but there probably should be. Same with similar options like -disable-free
and -disable-llvm-verifier.
Feel free to file a bug at bugs.llvm.org and CC me.
>
> Thanks.
>
> On Wednesday 15 February 2017 05:44 AM, Duncan P. N. Exon Smith wrote:
>>> On 2017-Feb-13, at 23:10, Subhendu Malakar via cfe-users
>>> <cfe-users@lists.llvm.org> wrote:
>>>
>>> Hi,
>>> I'm a newbie in LLVM environment.
>>>
>>> I'm trying to generate the LLVM IR of a c file using clang. The command
>>> line argument I'm passing is as :
>>> "clang -O0 -S -emit-llvm test.c -c -o test.ll"
>> If you add "-###" to the end of the command-line you can see the raw -cc1
>> command for the compilation. Depending on your version of clang, you should
>> see "-discard-value-names" in there. If you repeat the -cc1 command
>> yourself, skipping that option, you'll get variable names.
>>
>> If you're compiling clang yourself (it doesn't sound like you are, but just
>> in case), this -discard-value-names option is *not* passed by default in
>> asserts builds.
>>
>>> It is generating the LLVM IR properly but I'm not getting the variable
>>> names. e.g,
>>>
>>> for the c file :
>>> #include <stdio.h>
>>>
>>> int main()
>>> {
>>> int x;
>>> int y;
>>> x = 2;
>>> y =4;
>>> int z = x*y;
>>>
>>> if(x==y)
>>> {
>>> z = x*y;
>>> return z;
>>> } else
>>> {
>>> z = x+y;
>>> }
>>> printf("z = %d", z);
>>> return 0;
>>> }
>>>
>>>
>>> the corresponding llvm IR is :
>>>
>>> ; Function Attrs: nounwind uwtable
>>> define i32 @main() #0 {
>>> %1 = alloca i32, align 4
>>> %2 = alloca i32, align 4
>>> %3 = alloca i32, align 4
>>> %4 = alloca i32, align 4
>>> store i32 0, i32* %1, align 4
>>> store i32 2, i32* %2, align 4
>>> store i32 4, i32* %3, align 4
>>> %5 = load i32, i32* %2, align 4
>>> %6 = load i32, i32* %3, align 4
>>> %7 = mul nsw i32 %5, %6
>>> store i32 %7, i32* %4, align 4
>>> %8 = load i32, i32* %2, align 4
>>> %9 = load i32, i32* %3, align 4
>>> %10 = icmp eq i32 %8, %9
>>> br i1 %10, label %11, label %16
>>>
>>> ; <label>:11: ; preds = %0
>>> %12 = load i32, i32* %2, align 4
>>> %13 = load i32, i32* %3, align 4
>>> %14 = mul nsw i32 %12, %13
>>> store i32 %14, i32* %4, align 4
>>> %15 = load i32, i32* %4, align 4
>>> store i32 %15, i32* %1, align 4
>>> br label %21
>>>
>>> ; <label>:16: ; preds = %0
>>> %17 = load i32, i32* %2, align 4
>>> %18 = load i32, i32* %3, align 4
>>> %19 = add nsw i32 %17, %18
>>> store i32 %19, i32* %4, align 4
>>> br label %20
>>>
>>> ; <label>:20: ; preds = %16
>>> store i32 0, i32* %1, align 4
>>> br label %21
>>>
>>> ; <label>:21: ; preds = %20, %11
>>> %22 = load i32, i32* %1, align 4
>>> ret i32 %22
>>> }
>>>
>>>
>>> I wanted to get the variables in their original name i.e, x,y,z instead of
>>> %1,%2,%3, etc.
>>> Is it possible to do so?
>>>
>>> Thanks.
>>> _______________________________________________
>>> cfe-users mailing list
>>> cfe-users@lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-users
>
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