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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99199] [9/10/11 Regression] Very large
 boolean expression leads to quite a few return statements
Date: Mon, 22 Feb 2021 16:47:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99199

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Until before pro_and_epilogue we have a bb with just code_label, note and
return reg use which has 65 predecessors.
The pro_and_epilogue pass turns that into 65 simple_return jumps.
The ret insns at the end are there since the bbro pass, before that they ar=
e at
various spots in the IL and depending on the branch probabilities could even
make sense.
I guess we'd need some simplified crossjumping either during the bbro pass =
when
going from cfglayout mode into cfgrtl mode, or afterwards (but not too many
passes are left there) that would be able to cross-jump bbs containing thos=
e:
(code_label 1552 999 925 128 147 (nil) [1 uses])
(note 925 1552 1389 128 [bb 128] NOTE_INSN_BASIC_BLOCK)
(insn 1389 925 926 128 (use (reg/i:QI 0 ax)) -1
     (nil))
(jump_insn 926 1389 927 128 (simple_return) 837 {simple_return_internal}
     (nil)
 -> simple_return)=