[Bug rtl-optimization/84101] [7/8/9 Regression] -O3 and -ftree-vectorize trying too hard for function returning trivial pair-of-uint64_t-structure

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84101

--- Comment #25 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Apr  3 12:30:16 2019
New Revision: 270123

URL: https://gcc.gnu.org/viewcvs?rev=270123&root=gcc&view=rev
Log:
2019-04-03  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/84101
        * tree-vect-stmts.c: Include explow.h for hard_function_value,
        regs.h for hard_regno_nregs.
        (cfun_returns): New helper.
        (vect_model_store_cost): When vectorizing a store to a decl
        we return and the function ABI returns in a multi-reg location
        account for the possible spilling that will happen.

        * gcc.target/i386/pr84101.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr84101.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-stmts.c