diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index e8af7f34050..ef414797af5 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -857,6 +857,15 @@ simplify_truncation (machine_mode mode, rtx op, return simplify_gen_unary (TRUNCATE, mode, XEXP (op, 0), GET_MODE (XEXP (op, 0))); + /* (truncate:A (ior X C)) is (const_int -1) if C is equal to that already, + in mode A. */ + if (GET_CODE (op) == IOR + && SCALAR_INT_MODE_P (mode) + && SCALAR_INT_MODE_P (op_mode) + && CONST_INT_P (XEXP (op, 1)) + && trunc_int_for_mode (INTVAL (XEXP (op, 1)), mode) == -1) + return constm1_rtx; + return NULL_RTX; } @@ -6186,7 +6195,7 @@ simplify_subreg (machine_mode outermode, rtx op, unsigned int part_size, final_offset; rtx part, res; - enum machine_mode part_mode = GET_MODE (XEXP (op, 0)); + machine_mode part_mode = GET_MODE (XEXP (op, 0)); if (part_mode == VOIDmode) part_mode = GET_MODE_INNER (GET_MODE (op)); part_size = GET_MODE_SIZE (part_mode); |