diff options
Diffstat (limited to 'gcc/tree-data-ref.h')
| -rw-r--r-- | gcc/tree-data-ref.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/gcc/tree-data-ref.h b/gcc/tree-data-ref.h index 3a5068d..72c68d0 100644 --- a/gcc/tree-data-ref.h +++ b/gcc/tree-data-ref.h @@ -52,6 +52,42 @@ struct innermost_loop_behavior tree init; tree step; + /* BASE_ADDRESS is known to be misaligned by BASE_MISALIGNMENT bytes + from an alignment boundary of BASE_ALIGNMENT bytes. For example, + if we had: + + struct S __attribute__((aligned(16))) { ... }; + + char *ptr; + ... *(struct S *) (ptr - 4) ...; + + the information would be: + + base_address: ptr + base_aligment: 16 + base_misalignment: 4 + init: -4 + + where init cancels the base misalignment. If instead we had a + reference to a particular field: + + struct S __attribute__((aligned(16))) { ... int f; ... }; + + char *ptr; + ... ((struct S *) (ptr - 4))->f ...; + + the information would be: + + base_address: ptr + base_aligment: 16 + base_misalignment: 4 + init: -4 + offsetof (S, f) + + where base_address + init might also be misaligned, and by a different + amount from base_address. */ + unsigned int base_alignment; + unsigned int base_misalignment; + /* The largest power of two that divides OFFSET, capped to a suitably high value if the offset is zero. This is a byte rather than a bit quantity. */ @@ -147,6 +183,8 @@ struct data_reference #define DR_INIT(DR) (DR)->innermost.init #define DR_STEP(DR) (DR)->innermost.step #define DR_PTR_INFO(DR) (DR)->alias.ptr_info +#define DR_BASE_ALIGNMENT(DR) (DR)->innermost.base_alignment +#define DR_BASE_MISALIGNMENT(DR) (DR)->innermost.base_misalignment #define DR_OFFSET_ALIGNMENT(DR) (DR)->innermost.offset_alignment #define DR_STEP_ALIGNMENT(DR) (DR)->innermost.step_alignment #define DR_INNERMOST(DR) (DR)->innermost |