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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/104117] gcc10 fails to build icu for ppc64 on 10.5.8
 (direct access to a floating-point constant)
Date: Wed, 19 Jan 2022 14:58:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104117

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
               Host|powerpc-apple-darwin9       |
   Target Milestone|---                         |10.4
           Keywords|                            |wrong-code
              Build|powerpc-apple-darwin9       |
   Last reconfirmed|                            |2022-01-19

--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
most likely present on earlier branches.

The problem is that we have=20

double var =3D (double) 1;

LRA decides that loading a constant integer 1 into a FPR and then using
int->double is good.  However, it (a) decides to do this in the prologue
(before we have got a picbase set up) and (b) does not seem to be checking =
that
the target agrees that the addressing mode is legitimate (it is not).

----

NOTE: incidental changes on 11.x and master have hidden this (but the chang=
es
were not a fix for this bug, so it has most likely simply become latent).=