[COMMITTED] bpf: fix generation of neg and neg32 BPF instructions

[Jose E. Marchesi via Gcc-patches]

This patch fixes GCC to generate correct neg and neg32 instructions,
which do not take a source register operand.  A couple of new tests
are added.

Tested in bpf-unknown-none.

gcc/ChangeLog

2023-07-26  Jose E. Marchesi  <jose.march...@oracle.com>

        * config/bpf/bpf.md: Fix neg{SI,DI}2 insn.

gcc/testsuite/ChangeLog

2023-07-26  Jose E. Marchesi  <jose.march...@oracle.com>

        * gcc.target/bpf/neg-1.c: New test.
        * gcc.target/bpf/neg-pseudoc-1.c: Likewise.
---
 gcc/config/bpf/bpf.md                        |  4 ++--
 gcc/testsuite/gcc.target/bpf/neg-1.c         | 14 ++++++++++++++
 gcc/testsuite/gcc.target/bpf/neg-pseudoc-1.c | 14 ++++++++++++++
 3 files changed, 30 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/bpf/neg-1.c
 create mode 100644 gcc/testsuite/gcc.target/bpf/neg-pseudoc-1.c

diff --git a/gcc/config/bpf/bpf.md b/gcc/config/bpf/bpf.md
index 579a8213b09..1b5e1900d4f 100644
--- a/gcc/config/bpf/bpf.md
+++ b/gcc/config/bpf/bpf.md
@@ -142,9 +142,9 @@ (define_insn "sub<AM:mode>3"
 ;;; Negation
 (define_insn "neg<AM:mode>2"
   [(set (match_operand:AM         0 "register_operand"   "=r,r")
-        (neg:AM (match_operand:AM 1 "reg_or_imm_operand" " r,I")))]
+        (neg:AM (match_operand:AM 1 "reg_or_imm_operand" " 0,I")))]
   ""
-  "{neg<msuffix>\t%0,%1|%w0 = -%w1}"
+  "{neg<msuffix>\t%0|%w0 = -%w1}"
   [(set_attr "type" "<mtype>")])
 
 ;;; Multiplication
diff --git a/gcc/testsuite/gcc.target/bpf/neg-1.c 
b/gcc/testsuite/gcc.target/bpf/neg-1.c
new file mode 100644
index 00000000000..9ffb956859d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/bpf/neg-1.c
@@ -0,0 +1,14 @@
+/* Check negr and negr32 instructions.  */
+
+/* { dg-do compile } */
+/* { dg-options "-malu32" } */
+
+long foo (long a, long b, int x, int y)
+{
+  a = -b;
+  x = -y;
+  return a + x;
+}
+
+/* { dg-final { scan-assembler "neg\t%r.\n" } } */
+/* { dg-final { scan-assembler "neg32\t%r.\n" } } */
diff --git a/gcc/testsuite/gcc.target/bpf/neg-pseudoc-1.c 
b/gcc/testsuite/gcc.target/bpf/neg-pseudoc-1.c
new file mode 100644
index 00000000000..a4fb687f04a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/bpf/neg-pseudoc-1.c
@@ -0,0 +1,14 @@
+/* Check negr and negr32 instructions (pseudoc asm dialect.)  */
+
+/* { dg-do compile } */
+/* { dg-options "-malu32 -masm=pseudoc" } */
+
+long foo (long a, long b, int x, int y)
+{
+  a = -b;
+  x = -y;
+  return a + x;
+}
+
+/* { dg-final { scan-assembler {\t(r.) = -\1\n} } } */
+/* { dg-final { scan-assembler {\t(w.) = -\1\n} } } */
-- 
2.30.2