r256203 - in /trunk/gcc: ChangeLog genmodes.c m...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Jan  3 21:43:17 2018
New Revision: 256203

URL: https://gcc.gnu.org/viewcvs?rev=256203&root=gcc&view=rev
Log:
Allow targets to pick a vector prefix other than "V"

Originally the SVE port used the names for 256-bit vectors, as the
next available increment after Advanced SIMD.  However, that was
always a bit of a hack and is bound to confuse people new to the code.

Nothing actually requires vector modes to have names of the form
V<nunits><mode>, and after talking it over with the AArch64 maintainers,
we agreed to switch to things like:

    VNx16QI

instead.  This patch lets targets pick this kind of prefix.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
	* machmode.def (VECTOR_MODES_WITH_PREFIX): Document.
	* genmodes.c (VECTOR_MODES_WITH_PREFIX): New macro.
	(VECTOR_MODES): Use it.
	(make_vector_modes): Take the prefix as an argument.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/genmodes.c
    trunk/gcc/machmode.def