From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dfaust@sourceware.org>
Received: by sourceware.org (Postfix, from userid 7824)
	id A607C3890860; Thu,  8 Dec 2022 18:50:59 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A607C3890860
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1670525459;
	bh=MNhGnB/zTnoeNkE0y+TAuG5BK9OnQ7Q/9dfXdBv5T0A=;
	h=From:To:Subject:Date:From;
	b=SjC+ms7vPj8lL5+5+uGUo4pLqg5O60qHusjeZG2Og6Lpv3ygh7pr2wr5te88smWPz
	 zUw0IgG5QqhJyFCLV38uPbrrqDmuGtQhurxRYgYeNXt7bYqQBQVUtW2vL4o7a3fFLq
	 CVWKVED/kMxA/v1WsjsSAVZeHH4y+c2iS7YAYljs=
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="utf-8"
From: David Faust <dfaust@gcc.gnu.org>
To: gcc-cvs@gcc.gnu.org
Subject: [gcc r13-4566] bpf: add define_insn for bswap
X-Act-Checkin: gcc
X-Git-Author: David Faust <david.faust@oracle.com>
X-Git-Refname: refs/heads/master
X-Git-Oldrev: bd0485f20f4794f9787237706a6308473a8e9415
X-Git-Newrev: 5ddfe794405a514824382e96b1047d3195af23cc
Message-Id: <20221208185059.A607C3890860@sourceware.org>
Date: Thu,  8 Dec 2022 18:50:59 +0000 (GMT)
List-Id: <gcc-cvs.sourceware.org>

https://gcc.gnu.org/g:5ddfe794405a514824382e96b1047d3195af23cc

commit r13-4566-g5ddfe794405a514824382e96b1047d3195af23cc
Author: David Faust <david.faust@oracle.com>
Date:   Thu Dec 8 10:08:22 2022 -0800

    bpf: add define_insn for bswap
    
    The eBPF architecture provides 'end[be,le]' instructions for endianness
    swapping. Add a define_insn for bswap<mode>2 to use them instaed of
    falling back on a libcall.
    
    gcc/
    
            * config/bpf/bpf.md (bswap<mode>2): New define_insn.
    
    gcc/testsuite/
    
            * gcc.target/bpf/bswap-1.c: New test.

Diff:
---
 gcc/config/bpf/bpf.md                  | 17 +++++++++++++++++
 gcc/testsuite/gcc.target/bpf/bswap-1.c | 23 +++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/gcc/config/bpf/bpf.md b/gcc/config/bpf/bpf.md
index a28021aef26..22a133f1c79 100644
--- a/gcc/config/bpf/bpf.md
+++ b/gcc/config/bpf/bpf.md
@@ -341,6 +341,23 @@
   "rsh<msuffix>\t%0,%2"
   [(set_attr "type" "<mtype>")])
 
+;;;; Endianness conversion
+
+(define_mode_iterator BSM [HI SI DI])
+(define_mode_attr endmode [(HI "16") (SI "32") (DI "64")])
+
+(define_insn "bswap<BSM:mode>2"
+  [(set (match_operand:BSM 0 "register_operand"            "=r")
+        (bswap:BSM (match_operand:BSM 1 "register_operand" " r")))]
+  ""
+{
+  if (TARGET_BIG_ENDIAN)
+    return "endle\t%0, <endmode>";
+  else
+    return "endbe\t%0, <endmode>";
+}
+  [(set_attr "type" "end")])
+
 ;;;; Conditional branches
 
 ;; The eBPF jump instructions use 64-bit arithmetic when evaluating
diff --git a/gcc/testsuite/gcc.target/bpf/bswap-1.c b/gcc/testsuite/gcc.target/bpf/bswap-1.c
new file mode 100644
index 00000000000..4748143ada5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/bpf/bswap-1.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-mlittle-endian" } */
+
+unsigned short in16 = 0x1234U;
+unsigned int   in32 = 0x12345678U;
+unsigned long  in64 = 0x123456789abcdef0ULL;
+
+unsigned short out16 = 0;
+unsigned int   out32 = 0;
+unsigned long  out64 = 0;
+
+int foo (void)
+{
+  out16 = __builtin_bswap16 (in16);
+  out32 = __builtin_bswap32 (in32);
+  out64 = __builtin_bswap64 (in64);
+
+  return 0;
+}
+
+/* { dg-final { scan-assembler "endbe\t%r., 16" } } */
+/* { dg-final { scan-assembler "endbe\t%r., 32" } } */
+/* { dg-final { scan-assembler "endbe\t%r., 64" } } */