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Re: Debugger support for __float128 type?

From: Jonas Maebe <jonas dot maebe at elis dot ugent dot be>
To: gdb at sourceware dot org
Date: Fri, 02 Oct 2015 11:41:42 +0200
Subject: Re: Debugger support for __float128 type?
Authentication-results: sourceware.org; auth=none
References: <20151001161641 dot 3D31813CC at oc7340732750 dot ibm dot com>


Ulrich Weigand wrote on Thu, 01 Oct 2015:

Right, that's the current situation on PowerPC.  (On Intel, long double
is the 80-bit IEEE extended type, padded to either 12 bytes (32-bit)
or 16 bytes (64-bit), while __float128 is IEEE quad-precision.)

A side note here: the Free Pascal Compiler supports the 80-bitextended type stored in memory as either 10 bytes (for Turbo Pascaland Delphi compatibility) or using the ABI-specified size (which is 16bytes for Darwin/i386, and otherwise as you mention above).

We always output the used bytesize in the DWARF info, and in casethere are padding bytes (i.e., the non-10-byte size cases) we alsoemit the DW_AT_bit_offset.

I don't know how important it is in this context, but it may be usefulto keep in mind.



Jonas

References:
- Re: Debugger support for __float128 type?
  - From: Ulrich Weigand

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