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DW_AT_bit_size for 80-bit floating point
- From: "=?big5?b?RG91ZyBLd2FuICjD9q62vHcp?=" <dougkwan at google dot com>
- To: gdb at sourceware dot org
- Date: Fri, 7 Dec 2007 17:51:34 -0800
- Subject: DW_AT_bit_size for 80-bit floating point
I am working on the LTO project in gcc and one of the problem I am
looking at is to emit type information for 80-bit extended floating
point format on x86. My question is whether I can use DW_AT_bit_size
and DW_AT_bit_offset to encode the number of bits used.
The 80-bit format is stored in a 12-bit location so I need to emit
extra information. Striclty speaking DW_AT_bit_size and
DW_AT_bit_offset may not be appropriate. The exponent and mantissa
part of an 80-bit float may or may not be contiguous. I also need to
handle 80-bit extended based complex float. I'm sure the bits are not
contiguous for the complex case. So DW_AT_bit_size and
DW_AT_bit_offset are kind of odd here.
I can use a new dwarf extension like DW_AT_GNU_precision but I want to