[Bug debug/100541] [12 Regression] -fcompare-debug failure (length) with -O3 -fno-expensive-optimizations -fno-tree-dce -fno-tree-dominator-opts

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100541

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 50833
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50833&action=edit
another testcase (needs less compiler flags)

$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-dce -fno-tree-dominator-opts
-fcompare-debug aircraft_cmd.ii -save-temps
x86_64-pc-linux-gnu-gcc: error: aircraft_cmd.ii: '-fcompare-debug' failure
(length)
$ diff -u *gkd
--- a-aircraft_cmd.gk.ii.gkd    2021-05-18 08:56:42.271670788 +0200
+++ a-aircraft_cmd.ii.gkd       2021-05-18 08:56:42.191670787 +0200
@@ -65,7 +65,7 @@
                 (mult:HI (reg:HI 0 ax [orig:89 pretmp_31 ] [89])
                     (const_int -21845 [0xffffffffffffaaab])))
             (clobber (reg:CC 17 flags))
-        ]) "aircraft_cmd.ii":18:19# {*mulhi3_1}
+        ])# {*mulhi3_1}
      (expr_list:REG_UNUSED (reg:CC 17 flags)
         (nil)))
 (insn:TI # 0 0 4 (parallel [
@@ -73,7 +73,7 @@
                 (plus:HI (reg:HI 0 ax [101])
                     (const_int 10922 [0x2aaa])))
             (clobber (reg:CC 17 flags))
-        ]) "aircraft_cmd.ii":18:19# {*addhi_1}
+        ])# {*addhi_1}
      (expr_list:REG_UNUSED (reg:CC 17 flags)
         (nil)))
 (insn:TI # 0 0 4 (set (reg:CC 17 flags)