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Re: 32 bit float emulation on 16 bit machine

From: Ian Lance Taylor <iant at google dot com>
To: Florent Defay <spira dot inhabitant at gmail dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Tue, 07 Jul 2009 06:59:56 -0700
Subject: Re: 32 bit float emulation on 16 bit machine
References: <8502af3c0907030045v3ee79629ia902b35797bdf8b@mail.gmail.com> <m3vdm5ls25.fsf@google.com> <8502af3c0907070055g2b3134d9r9f2eebbdc3359b92@mail.gmail.com>

Florent Defay <spira.inhabitant@gmail.com> writes:

> /home/guest1/gcc/new_build/target/libgcc/../.././gcc/fp-bit.c:671:
> undefined reference to `__ucmpsi2'

__ucmpsi2 is a function which does an unsigned comparison of two 32-bit
integers.  You can get gcc to build that by compiling libgcc2.c with
LIBGCC2_UNITS_PER_WORD defined as 2.  If your processor has a carry
flag, it will often be more efficient to provide an insn which does it,
these days typically via cbranchsi4.

Ian

Follow-Ups:
- Re: 32 bit float emulation on 16 bit machine
  - From: Florent Defay

References:
- 32 bit float emulation on 16 bit machine
  - From: Florent Defay
- Re: 32 bit float emulation on 16 bit machine
  - From: Ian Lance Taylor
- Re: 32 bit float emulation on 16 bit machine
  - From: Florent Defay

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