diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index edc5d5f..b3fc304 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -1125,14 +1125,16 @@ get_memory_rtx (tree exp, tree len) && (TREE_INT_CST_LOW (DECL_SIZE (field)) % BITS_PER_UNIT) == 0)); + /* If we can prove that the memory starting at XEXP (mem, 0) and + ending at XEXP (mem, 0) + LENGTH will fit into this field, we + can keep the COMPONENT_REF in MEM_EXPR. But be careful with + fields without DECL_SIZE_UNIT like flexible array members. */ if (length >= 0 + && DECL_SIZE_UNIT (field) && host_integerp (DECL_SIZE_UNIT (field), 0)) { HOST_WIDE_INT size = TREE_INT_CST_LOW (DECL_SIZE_UNIT (field)); - /* If we can prove the memory starting at XEXP (mem, 0) - and ending at XEXP (mem, 0) + LENGTH will fit into - this field, we can keep that COMPONENT_REF in MEM_EXPR. */ if (offset <= size && length <= size && offset + length <= size) |