diff options
Diffstat (limited to 'gcc/gimple-ssa-store-merging.cc')
| -rw-r--r-- | gcc/gimple-ssa-store-merging.cc | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/gcc/gimple-ssa-store-merging.cc b/gcc/gimple-ssa-store-merging.cc index 5a477c4..df7afd2 100644 --- a/gcc/gimple-ssa-store-merging.cc +++ b/gcc/gimple-ssa-store-merging.cc @@ -1614,7 +1614,7 @@ namespace { then VAL represents the constant and all the other fields are zero, or a memory load, then VAL represents the reference, BASE_ADDR is non-NULL and the other fields also reflect the memory load, or an SSA name, then - VAL represents the SSA name and all the other fields are zero, */ + VAL represents the SSA name and all the other fields are zero. */ class store_operand_info { @@ -2309,6 +2309,10 @@ merged_store_group::apply_stores () if (buf_size <= MOVE_MAX) string_concatenation = false; + /* String concatenation only works for byte aligned start and end. */ + if (start % BITS_PER_UNIT != 0 || width % BITS_PER_UNIT != 0) + string_concatenation = false; + /* Create a power-of-2-sized buffer for native_encode_expr. */ if (!string_concatenation) buf_size = 1 << ceil_log2 (buf_size); @@ -3631,7 +3635,7 @@ split_group (merged_store_group *group, bool allow_unaligned_store, /* For bswap framework using sets of stores, all the checking has been done earlier in try_coalesce_bswap and the result always needs to be emitted - as a single store. Likewise for string concatenation, */ + as a single store. Likewise for string concatenation. */ if (group->stores[0]->rhs_code == LROTATE_EXPR || group->stores[0]->rhs_code == NOP_EXPR || group->string_concatenation) |