https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87871
--- Comment #35 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Peter's patch solves this particular problem, but not the PR unfortunately.
I finally understand Jakub's comment 30. This patch solves the PR (also
without Peter's patch):
===
diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md
index 0aecd03..67dddb2 100644
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -6340,7 +6340,7 @@ (define_insn "*movsi_compare0"
(const_int 0)))
(set (match_operand:SI 0 "s_register_operand" "=r,r")
(match_dup 1))]
- "TARGET_32BIT"
+ "TARGET_32BIT && reload_completed"
"@
cmp%?\\t%0, #0
subs%?\\t%0, %1, #0"
===
