PATCH: Add -mlong-double-128 and make it default for 64-bit Bionic

H.J. Lu
Fri Jan 31 17:32:00 GMT 2014

On Fri, Jan 31, 2014 at 9:04 AM, Uros Bizjak <> wrote:
> On Fri, Jan 31, 2014 at 5:58 PM, Andrew Pinski <> wrote:
>> On Fri, Jan 31, 2014 at 5:59 AM, H.J. Lu <> wrote:
>>> Hi,
>>> For 64-bit Android, long double is 128-bit IEEE-754 floating point type.
>>> This patch adds -mlong-double-128 to i386 and makes it default for 64-bit
>>> Bionic.  I only added MASK_LONG_DOUBLE_128.  I made -mlong-double-128,
>>> -mlong-double-64 and -mlong-double-80 negate each other so that the
>>> last one on command line wins.  It os OK since we don't support
>>> -mlong-double-xxx in target attribute. I added some testcases to verify
>>> it works correctly.  OK for trunk?
>> I don't see any where in the documentation that explains the
>> difference between -mlong-double-128 and -m128bit-long-double.  Can
>> you please add that  -mlong-double-128 causes soft-floating point.
>> Also what about the interactions between these two options.
> The -m128bit-long-double has no effect on TFmode. The names are
> similar by coincidence, but it is a good idea to mention the
> difference in the documentation.

I will come up with something after -mlong-double-128 is checked in.



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