commit 53d12ecd624ec901d8449cfa1917f6f90e910927 (HEAD -> master, origin/master,
origin/HEAD)
Author: Jose E. Marchesi <jose.march...@oracle.com>
Date: Fri Jul 14 13:54:06 2023 +0200
bpf: enable instruction scheduling
This patch adds a dummy FSM to bpf.md in order to get INSN_SCHEDULING
defined. If the later is not defined, the `combine' pass generates
paradoxical subregs of mems, which seems to then be mishandled by LRA,
resulting in invalid code.
Tested in bpf-unknown-none.
gcc/ChangeLog:
2023-07-14 Jose E. Marchesi <jose.march...@oracle.com>
PR target/110657
* config/bpf/bpf.md: Enable instruction scheduling.
diff --git a/gcc/config/bpf/bpf.md b/gcc/config/bpf/bpf.md
index f6be0a21234..329f62f55c3 100644
--- a/gcc/config/bpf/bpf.md
+++ b/gcc/config/bpf/bpf.md
@@ -20,6 +20,17 @@
(include "predicates.md")
(include "constraints.md")
+;;;; Instruction Scheduler FSM
+
+;; This is just to get INSN_SCHEDULING defined, so that combine does
+;; not make paradoxical subregs of memory. These subregs seems to
+;; confuse LRA that ends generating wrong instructions.
+
+(define_automaton "frob")
+(define_cpu_unit "frob_unit" "frob")
+(define_insn_reservation "frobnicator" 814
+ (const_int 0) "frob_unit")
+
;;;; Unspecs
(define_c_enum "unspec" [
