[Bug target/72827] [7 Regression] gnat bootstrap broken on powerpc64le-linux-gnu

["meissner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72827

--- Comment #20 from Michael Meissner <meissner at gcc dot gnu.org> ---
Yeah, it sounds like you don't want to adjust any of the stack related
registers.

However, in looking at this $#!%, we probably need to rewrite it so it doesn't
do clever tricks like this.  Which probably means a trip through the whole
legitimize addressing support and secondary reload.

One thing that might help is removing the test for TARGET_QUAD_WORD around line
9448 of rs6000.c, and look for other places in rs6000.c that TImode and
TARGET_QUAD_WORD are mentioned near each other.

On LE systems, TARGET_QUAD_WORD is false because the LQ/STQ load the words in
the wrong order.

One consequence of this is it only allows TImode value addresses to be a single
register, on the other hand, when you are moving TImode in GPRs, you can use
D-FORM addressing to address the secondary parts.

In theory, PRE_MODIFY, PRE_INC, and PRE_DEC should never be set for TImode.