CODEWITHSUNDEEP
clangllvmllvm-ir
slmyers
slmyers

Reputation: 767

how to make clang compile to LLVM IR with textual labels for simple function

Hello I have to parse some LLVM IR code for a compiler course. I am very new to LLVM. I have clang and LLVM on my computer, and when I compile a simple C program:

#include <stdio.h>


int main(int argc, char *argv[])
{
    for (int i = 0; i < 10; i++) {
     printf("Stuff!\n");
    }

return 0;
}

using command: clang -cc1 test.c -emit-llvm

I get llvm IR with what I believe are called implicit blocks:

; <label>:4 ; preds = %9, %0

However my parser also needs to handle llvm IR with textual labels:

for.cond: ; preds = %for.inc, %entry

My problem is that I do not know how to generate such IR and was hoping someone show me how. I tried Google and such, but I couldn't find appropriate information. Thanks in advance.

Upvotes: 0

Views: 1349

Answers (2)

Jatin Sharma
Jatin Sharma

Reputation: 341

The accepted answer is no longer valid. Nor is it a good way to achieve the stated.
In case someone stumbles upon this question, like I did, I'm providing the answer.

clang-8 -S -fno-discard-value-names -emit-llvm test.c

Upvotes: 1

slmyers
slmyers

Reputation: 767

use this site with Show detailed bytecode analysis checked

http://ellcc.org/demo/index.cgi

Upvotes: 1

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