diff options
Diffstat (limited to 'gcc/tree-loop-distribution.c')
| -rw-r--r-- | gcc/tree-loop-distribution.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c index 181e4e9..342b964 100644 --- a/gcc/tree-loop-distribution.c +++ b/gcc/tree-loop-distribution.c @@ -750,12 +750,40 @@ const_with_all_bytes_same (tree val) int i, len; if (integer_zerop (val) - || real_zerop (val) || (TREE_CODE (val) == CONSTRUCTOR && !TREE_CLOBBER_P (val) && CONSTRUCTOR_NELTS (val) == 0)) return 0; + if (real_zerop (val)) + { + /* Only return 0 for +0.0, not for -0.0, which doesn't have + an all bytes same memory representation. Don't transform + -0.0 stores into +0.0 even for !HONOR_SIGNED_ZEROS. */ + switch (TREE_CODE (val)) + { + case REAL_CST: + if (!real_isneg (TREE_REAL_CST_PTR (val))) + return 0; + break; + case COMPLEX_CST: + if (!const_with_all_bytes_same (TREE_REALPART (val)) + && !const_with_all_bytes_same (TREE_IMAGPART (val))) + return 0; + break; + case VECTOR_CST: + unsigned int j; + for (j = 0; j < VECTOR_CST_NELTS (val); ++j) + if (const_with_all_bytes_same (VECTOR_CST_ELT (val, i))) + break; + if (j == VECTOR_CST_NELTS (val)) + return 0; + break; + default: + break; + } + } + if (CHAR_BIT != 8 || BITS_PER_UNIT != 8) return -1; |