[Bug target/65171] [5 Regression] r214254 causes thousands of std::length_errors running boost testsuite on ppc64le

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65171

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
The logic to avoid subregs of TImode wasn't getting executed.  I have a patch
that fixes this; doing regression testing and then will get it submitted to the
list.  Still working in the background on reducing the test case. :/