[Bug target/79242] [7 Regression] ICE in simplify_subreg, at simplify-rtx.c:6029

[jozefl.gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79242

--- Comment #11 from Jozef Lawrynowicz <jozefl.gcc at gmail dot com> ---
(In reply to Eric Gallager from comment #10)
> (In reply to Jeffrey A. Law from comment #9)
> > Author: law
> > Date: Wed Feb 14 07:21:11 2018
> > New Revision: 257653
> > 
> > URL: https://gcc.gnu.org/viewcvs?rev=257653&root=gcc&view=rev
> > Log:
> > 2018-02-14  Jozef Lawrynowicz <jozefl.gcc@gmail.com>
> > 
> > 	PR target/79242
> > 	* machmode.def: Define a complex mode for PARTIAL_INT.
> > 	* genmodes.c (complex_class): Return MODE_COMPLEX_INT for
> > 	MODE_PARTIAL_INT.
> > 	* doc/rtl.texi: Document CSPImode.
> > 	* config/msp430/msp430.c (msp430_hard_regno_nregs): Add CPSImode
> > 	handling.
> > 	(msp430_hard_regno_nregs_with_padding): Likewise.
> > 
> > 	PR target/79242
> > 	* gcc.target/msp430/pr79242.c: New test.
> > 
> > Added:
> >     trunk/gcc/testsuite/gcc.target/msp430/pr79242.c
> > Modified:
> >     trunk/gcc/ChangeLog
> >     trunk/gcc/config/msp430/msp430.c
> >     trunk/gcc/doc/rtl.texi
> >     trunk/gcc/genmodes.c
> >     trunk/gcc/machmode.def
> >     trunk/gcc/testsuite/ChangeLog
> 
> Did this fix it?

The patch is currently only on trunk, but after back-porting it to
gcc-7-branch, GCC now builds successfully for the msp430-elf target.
The original testcase also compiles successfully with the resulting toolchain.

Trunk still doesn't build for msp430-elf though, due to Bug 84406.