diff options
Diffstat (limited to 'contrib/gcc/combine.c')
| -rw-r--r-- | contrib/gcc/combine.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/contrib/gcc/combine.c b/contrib/gcc/combine.c index acaf3b1..5e8ad1a 100644 --- a/contrib/gcc/combine.c +++ b/contrib/gcc/combine.c @@ -6016,6 +6016,11 @@ make_extraction (mode, inner, pos, pos_rtx, len, final_word += (GET_MODE_SIZE (inner_mode) - GET_MODE_SIZE (tmode)) % UNITS_PER_WORD; + /* Avoid creating invalid subregs, for example when + simplifying (x>>32)&255. */ + if (final_word >= GET_MODE_SIZE (inner_mode)) + return NULL_RTX; + new = gen_rtx_SUBREG (tmode, inner, final_word); } else @@ -6852,10 +6857,10 @@ force_to_mode (x, mode, mask, reg, just_select) return force_to_mode (x, mode, mask, reg, next_select); } - /* Similarly, if C contains every bit in the mask, then we may + /* Similarly, if C contains every bit in the fuller_mask, then we may replace with (not Y). */ if (GET_CODE (XEXP (x, 0)) == CONST_INT - && ((INTVAL (XEXP (x, 0)) | (HOST_WIDE_INT) mask) + && ((INTVAL (XEXP (x, 0)) | (HOST_WIDE_INT) fuller_mask) == INTVAL (XEXP (x, 0)))) { x = simplify_gen_unary (NOT, GET_MODE (x), |
