I am trying to analyse instruction count of a C++ program using LLVM passes. Issue is the when i use function from standard library like sqrt() from cmath, the LLVM IR does not contain the instructions from sqrt() but instead represents it like

declare double @sqrt(double noundef) #1

This is causing problems from me as I am unable to count the total number of instruction in entire program. Below is my C++ Program

#include <cmath>
#include <iostream>

using namespace std;

int main(){
    int num = 10;
    float c = (float) std::sqrt((double) num);
    return 0;
}

and the LLVM IR

; ModuleID = 'hello.cpp'
source_filename = "hello.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

module asm ".globl _ZSt21ios_base_library_initv"

; Function Attrs: mustprogress noinline norecurse nounwind uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca float, align 4
  store i32 0, ptr %1, align 4
  store i32 10, ptr %2, align 4
  %4 = load i32, ptr %2, align 4
  %5 = sitofp i32 %4 to double
  %6 = call double @sqrt(double noundef %5) #2
  %7 = fptrunc double %6 to float
  store float %7, ptr %3, align 4
  ret i32 0
}

; Function Attrs: nounwind
declare double @sqrt(double noundef) #1

attributes #0 = { mustprogress noinline norecurse nounwind uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nounwind "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3, !4}
!llvm.ident = !{!5}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{i32 7, !"frame-pointer", i32 2}
!5 = !{!"Ubuntu clang version 18.1.3 (1)"}