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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99199] New: [9/10/11 Regression] Very large
 boolean expression leads to quite a few return statements
Date: Mon, 22 Feb 2021 14:16:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99199

            Bug ID: 99199
           Summary: [9/10/11 Regression] Very large boolean expression
                    leads to quite a few return statements
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

Created attachment 50233
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50233&action=3Dedit
C test case

The attached test case translated rather strangely with -O3.

The instruction sequence is very long, and it generates 42 return
instructions, quite a few of them at the end:

$ gcc -O3 -S tr.c
$ wc -l tr.s
504 tr.s
$ grep ret tr.s | wc -l
42

...

L24:
        movl    %r9d, %eax
        orl     %r8d, %eax
        xorl    $1, %eax
        jmp     .L112
.L131:
        ret
.L132:
        ret
.L140:
        ret
.L141:
        ret
.L145:
        ret
.L146:
        ret
.L148:
        ret
.L142:
        ret
.L143:
        ret
.L150:
        ret
.L152:
        ret
.L151:
        ret
.L138:
        ret
.L129:
        ret
.L147:
        ret
        .cfi_endproc

Seems to have been introduced with gcc 9, gcc 8 is fine.=