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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/105586] [11/12/13 Regression] -fcompare-debug failure
 (length) with -O2 -fno-if-conversion -mtune=power4
 -fno-guess-branch-probability
Date: Fri, 13 May 2022 16:49:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105586

--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
We have

+(debug_insn 11 10 81 2 (var_location:QI u8_1 (mem/c:QI (plus:DI (unspec:DI=
 [
+                    (symbol_ref:DI ("*.LANCHOR0") [flags 0x182])
+                    (reg:DI 2 2)
+                ] UNSPEC_TOCREL)
+            (const_int 3 [0x3])) [1 g+3 S1 A8])) "../105586.c":11:8 -1
+     (nil))

(the first such unspec in the file), and sched1 does

+;;       0--> b  0: i  11 loc [unspec[`*.LANCHOR0',%2] 47+0x3]=20=20=20
:nothing:GENERAL_REGS+0(0)FLOAT_REGS+0(0)CR_REGS+0(0)SPECIAL_REGS+0(0)

with it.  Things in debug_insns should not influence code generation.=