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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/112657] [13/14 Regression] missed
 optimization: cmove not used with multiple returns
Date: Wed, 22 Nov 2023 09:38:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112657

--- Comment #5 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Digging a bit further:

if_info.max_seq_cost is calculated via targetm.max_noce_ifcvt_seq_cost, whe=
re
without params set we return:

  return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (2);

with:

#define BRANCH_COST(speed_p, predictable_p) \
  (!(speed_p) ? 2 : (predictable_p) ? 0 : ix86_branch_cost)

So, the conversion is clearly not desirable for well predicted jumps.=