diff options
Diffstat (limited to 'gcc/tree-vectorizer.h')
| -rw-r--r-- | gcc/tree-vectorizer.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h index 935aab9..51367ea 100644 --- a/gcc/tree-vectorizer.h +++ b/gcc/tree-vectorizer.h @@ -347,6 +347,25 @@ typedef struct _loop_vec_info { fix it up. */ bool operands_swapped; + /* True if there are no loop carried data dependencies in the loop. + If loop->safelen <= 1, then this is always true, either the loop + didn't have any loop carried data dependencies, or the loop is being + vectorized guarded with some runtime alias checks, or couldn't + be vectorized at all, but then this field shouldn't be used. + For loop->safelen >= 2, the user has asserted that there are no + backward dependencies, but there still could be loop carried forward + dependencies in such loops. This flag will be false if normal + vectorizer data dependency analysis would fail or require versioning + for alias, but because of loop->safelen >= 2 it has been vectorized + even without versioning for alias. E.g. in: + #pragma omp simd + for (int i = 0; i < m; i++) + a[i] = a[i + k] * c; + (or #pragma simd or #pragma ivdep) we can vectorize this and it will + DTRT even for k > 0 && k < m, but without safelen we would not + vectorize this, so this field would be false. */ + bool no_data_dependencies; + /* If if-conversion versioned this loop before conversion, this is the loop version without if-conversion. */ struct loop *scalar_loop; @@ -385,6 +404,7 @@ typedef struct _loop_vec_info { #define LOOP_VINFO_PEELING_FOR_GAPS(L) (L)->peeling_for_gaps #define LOOP_VINFO_OPERANDS_SWAPPED(L) (L)->operands_swapped #define LOOP_VINFO_PEELING_FOR_NITER(L) (L)->peeling_for_niter +#define LOOP_VINFO_NO_DATA_DEPENDENCIES(L) (L)->no_data_dependencies #define LOOP_VINFO_SCALAR_LOOP(L) (L)->scalar_loop #define LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT(L) \ |