https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99199
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=50233&action=edit
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.
