[Bug target/87560] ICE in curr_insn_transform, at lra-constraints.c:3892

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87560

--- Comment #10 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
rs6000: Fix -mpower9-vector -mno-altivec ICE (PR87560)

PR87560 reports an ICE when a test case is compiled with -mpower9-vector
and -mno-altivec.  This patch terminates compilation with an error when
this combination (and other unreasonable ones) are requested.

Bootstrapped and tested on powerpc64le-unknown-linux-gnu with no
regressions.  Reported error is now:

f951: Error: '-mno-altivec' turns off '-mpower9-vector'

2020-03-12  Bill Schmidt  <wschmidt@linux.ibm.com>

        Backport from master
        2020-03-02  Bill Schmidt  <wschmidt@linux.ibm.com>

        PR target/87560
        * rs6000-cpus.def (OTHER_ALTIVEC_MASKS): New #define.
        * rs6000.c (rs6000_disable_incompatible_switches): Add table entry
        for OPTION_MASK_ALTIVEC.