[Bug tree-optimization/68964] [6 regression] Internal compiler error for test case gcc.dg/tm/20100610.c since r231674

[rth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68964

--- Comment #4 from Richard Henderson <rth at gcc dot gnu.org> ---
Oh, yes, duh.

These vector types are (at least partially) target-specific, and so the
function definitions are left for the target to fill in at startup time.

See config/i386/i386.c bdesc_tm for MMX/SSE/AVX wonkiness.

I expect it's possible to find a target-independent default for these
function definitions, if the target hook has failed to fill them in.
Perhaps check for target support of N-bit wide vector of SImode, then
N-bit wide vector of SFmode, before failing?