diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 1361b10..e9bd667 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -7798,7 +7798,12 @@ apply_distributive_law (rtx x) || (GET_MODE_SIZE (GET_MODE (lhs)) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (lhs)))) || VECTOR_MODE_P (GET_MODE (lhs)) - || GET_MODE_SIZE (GET_MODE (SUBREG_REG (lhs))) > UNITS_PER_WORD) + || GET_MODE_SIZE (GET_MODE (SUBREG_REG (lhs))) > UNITS_PER_WORD + /* Result might need to be truncated. Don't change mode if + explicit truncation is needed. */ + || !TRULY_NOOP_TRUNCATION + (GET_MODE_BITSIZE (GET_MODE (x)), + GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (lhs))))) return x; tem = simplify_gen_binary (code, GET_MODE (SUBREG_REG (lhs)), |