foo.c


// Taken from Adam Nemet's November 2016 LLVM talk

#if 0
void accumulate (int x, int *a)
{
  *a += x;
}
#else
extern void accumulate (int x, int *a);
#endif

int compute_sum (int arr[], int n)
{
  int sum = 0;
  for (int i = 0; i < n; ++i)
  ^=== analyzing loop ===
    === analyze_loop_nest ===
      === vect_analyze_loop_form ===
        === get_loop_niters ===
      symbolic number of iterations is (unsigned int) n_9(D)
      not vectorized: loop contains function calls or data references that cannot be analyzed
  
  ^=== vect_slp_analyze_bb ===
  
  ^=== vect_slp_analyze_bb ===
    === vect_analyze_data_refs ===
      got vectype for stmt: _4 = *_3;vector(4) int
    not vectorized: not enough data-refs in basic block
    === vect_analyze_data_refs ===
    not vectorized: not enough data-refs in basic block
  
  ^=== vect_slp_analyze_bb ===
  
  ^=== vect_slp_analyze_bb ===
    === vect_analyze_data_refs ===
      got vectype for stmt: pretmp_24 = sum;vector(4) int
    not vectorized: not enough data-refs in basic block
  
  ^=== vect_slp_analyze_bb ===
    === vect_analyze_data_refs ===
    not vectorized: not enough data-refs in basic block
  
    accumulate (arr[i], &sum);
  return sum;
}

Line	Hotness	Pass	Source	Function / Inlining Chain
1			// Taken from Adam Nemet's November 2016 LLVM talk
2
3			#if 0
4			void accumulate (int x, int *a)
5			{
6			*a += x;
7			}
8			#else
9			extern void accumulate (int x, int *a);
10			#endif
11
12			int compute_sum (int arr[], int n)
13			{
14			int sum = 0;
15			for (int i = 0; i < n; ++i)
	955630000	vect	^=== analyzing loop === === analyze_loop_nest === === vect_analyze_loop_form === === get_loop_niters === symbolic number of iterations is `(unsigned int) n_9(D)` not vectorized: loop contains function calls or data references that cannot be analyzed	`compute_sum`
	118112000	slp	^=== vect_slp_analyze_bb ===	`compute_sum`
	118112000	slp	^=== vect_slp_analyze_bb === === vect_analyze_data_refs === got vectype for stmt: `_4 = *_3;vector(4) int` not vectorized: not enough data-refs in basic block === vect_analyze_data_refs === not vectorized: not enough data-refs in basic block	`compute_sum`
	955630000	slp	^=== vect_slp_analyze_bb ===	`compute_sum`
	955630000	slp	^=== vect_slp_analyze_bb === === vect_analyze_data_refs === got vectype for stmt: `pretmp_24 = sum;vector(4) int` not vectorized: not enough data-refs in basic block	`compute_sum`
	955630000	slp	^=== vect_slp_analyze_bb === === vect_analyze_data_refs === not vectorized: not enough data-refs in basic block	`compute_sum`
16			accumulate (arr[i], &sum);
17			return sum;
18			}