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On 05/05/2016 04:20 PM, Richard Sandiford wrote:
expand_debug_expr handled negative bit positions using: else if (bitpos < 0) { HOST_WIDE_INT units = (-bitpos + BITS_PER_UNIT - 1) / BITS_PER_UNIT; op0 = adjust_address_nv (op0, mode1, units); bitpos += units * BITS_PER_UNIT; } Here "units" is the negative of the (negative) byte offset, so I think we should be offsetting OP0 by -units instead. E.g. a bitpos of -17 would give units==3, so this code would move OP0 up by 3 bytes and set bitpos to 7, giving a total bitpos of 31.
gcc/ * cfgexpand.c (expand_debug_expr): Fix address offset for negative bitpos.
Ok. Bernd
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