[Bug target/82674] ICE with -fstack-clash-protection

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82674

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Tue Oct 31 09:49:40 2017
New Revision: 254252

URL: https://gcc.gnu.org/viewcvs?rev=254252&root=gcc&view=rev
Log:
Subject: [PATCH] rs6000: Fix crash with big stack clash interval (PR82674)

If the user asks for a stack clash probe interval of 64kB, we currently
generate a "stdu rX,-65536(r1)" instruction.  That instruction does not
exist (the offset is a 16-bit signed number).  If the offset is too big
we should force it into a register and generate a "stdux rX,rY,r1"
instruction, instead.


        PR target/82674
        * config/rs6000/rs6000.md (allocate_stack): Force update interval
        into a register if it does not fit into an immediate offset field.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.md