[Bug target/114232] [14 regression] ICE when building rr-5.7.0 with LTO on x86

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114232

--- Comment #13 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #12)
> Still, it would be nice to understand what changed
> optimize_function_for_size_p (cfun)
> after IPA.  Is something adjusting node->count or node->frequency?
> Otherwise it should just depend on the optimize_size flag which should not
> change...

The target-dependent issue is with insn patterns we split to. These are enabled
with "!TARGET_PARTIAL_REG_STALL || optimize_function_for_size_p (cfun)", as
they are intended to be combined from movstrict insn pattern (which can FAIL).

So, the condition for V2QI insn is now either !TARGET_PARTIAL_REG_STALL or
TARGET_SSE2 (where we disable alternative 0 for TARGET_PARTIAL_REG_STALL
targets, but we still emit SSE instruction).

Please note that while -march=i686 enables TARGET_PARTIAL_REG_STALL, it enables
SSE2, so the proposed solution won't have much impact. Also, V2QImode is not
much used, so I guess the proposed solution is the right compromise.