diff options
Diffstat (limited to 'gcc/var-tracking.c')
| -rw-r--r-- | gcc/var-tracking.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/var-tracking.c b/gcc/var-tracking.c index 9ec5d8b..da4c61e 100644 --- a/gcc/var-tracking.c +++ b/gcc/var-tracking.c @@ -1011,7 +1011,13 @@ use_narrower_mode (rtx x, machine_mode mode, machine_mode wmode) return simplify_gen_binary (GET_CODE (x), mode, op0, op1); case ASHIFT: op0 = use_narrower_mode (XEXP (x, 0), mode, wmode); - return simplify_gen_binary (ASHIFT, mode, op0, XEXP (x, 1)); + op1 = XEXP (x, 1); + /* Ensure shift amount is not wider than mode. */ + if (GET_MODE (op1) == VOIDmode) + op1 = lowpart_subreg (mode, op1, wmode); + else if (GET_MODE_PRECISION (mode) < GET_MODE_PRECISION (GET_MODE (op1))) + op1 = lowpart_subreg (mode, op1, GET_MODE (op1)); + return simplify_gen_binary (ASHIFT, mode, op0, op1); default: gcc_unreachable (); } |