This fixes an issue with the long displacement memory address
constraints S and T. These were defined to only accept long
displacement addresses. This is wrong since a memory constraint must
not reject an address with a 0 displacement. Reload relies on being
able to turn an invalid memory address into a valid one by reloading
the address into a base register. The S and T constraints would
reject such an address.
This isn't really a problem for the backend since we used the
constraints with that knowledge there but it is a problem for people
writing inline assemblies.
gcc/ChangeLog:
2016-04-29 Ulrich Weigand <uweigand@de.ibm.com>
* config/s390/constraints.md ("U", "W"): Invoke
s390_mem_constraint with "ZR" and "ZT".
* config/s390/s390.c (s390_check_qrst_address): Reject invalid
addresses when using LRA. Accept also short displacements for S
and T constraints. Do not check for long displacement target for
S and T constraints.
(s390_mem_constraint): Remove handling of U and W constraints.
* config/s390/s390.md (various patterns): Remove the short
displacement constraints (Q and R) if a long displacement
constraint is present. Add longdisp as required CPU capability.
* config/s390/vector.md: Likewise.
* config/s390/vx-builtins.md: Likewise.
From-SVN: r235626
