[PATCH] ARM fixed-point support [1/6]: comparison optab biasing

[Julian Brown]

As per Joseph's suggestion here:

http://gcc.gnu.org/ml/gcc-patches/2011-05/msg00846.html

I am re-posting machine-independent parts of my ARM fixed-point support
patches, with explanations as to why each part is necessary.

This is the first: on ARM, TARGET_LIB_INT_CMP_BIASED is false for
TARGET_BPABI targets (i.e. most currently-interesting cases --
EABI comparison helper functions return -1/0/1 for lt/eq/gt rather than
0/1/2). However the fixed-point helper library uses biased comparisons
unconditionally. So, this patch just makes comparisons between
fixed-point quantities use the biasing rather than not. (Grepping
config/, in practice, this will only affect ARM.)

Tested in a series with other fixed-point patches. OK to apply?

Julian

ChangeLog

    gcc/
    * optabs.c (prepare_cmp_insn): Use correct biasing for fixed-point
    comparison helpers.
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