https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120409
--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
typeck.cc has
/* We can't initialize a register from a AGGR_INIT_EXPR. */
else if (! cfun->returns_struct
&& TREE_CODE (retval) == TARGET_EXPR
&& TREE_CODE (TARGET_EXPR_INITIAL (retval)) == AGGR_INIT_EXPR)
retval = build2 (COMPOUND_EXPR, TREE_TYPE (retval), retval,
TARGET_EXPR_SLOT (retval));
This is triggered for x32 and set_target_expr_eliding doesn't set
TARGET_EXPR_ELIDING_P for COMPOUND_EXPR.
