[Bug target/115648] [15 Regression] GCN: [-PASS:-]{+FAIL:+} gcc.dg/hoist-register-pressure-{2, 3}.c scan-rtl-dump hoist "PRE/HOIST: end of bb .* copying expression"

[guihaoc at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115648

--- Comment #1 from HaoChen Gui <guihaoc at gcc dot gnu.org> ---
The patch replaced rtx cost comparison with insn cost comparison. Some
replacements can be done before but can't now. Or vice versa. Please check the
fwprop dump log via -fdump-rtl-fwprop1-details and judge if the replacements
are benefits or not.