Hi All,

This adds support for using scalar fneg on the V1DF type.

Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* config/aarch64/aarch64-simd.md (negv1df2): New.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/simd/addsub_2.c: New test.

--- inline copy of patch -- 
diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md
index f4152160084d6b6f34bd69f0ba6386c1ab50f77e..cf8c094bd4b76981cef2dd5dd7b8e6be0d56101f 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -2713,6 +2713,14 @@ (define_insn "neg<mode>2"
   [(set_attr "type" "neon_fp_neg_<stype><q>")]
 )
 
+(define_insn "negv1df2"
+ [(set (match_operand:V1DF 0 "register_operand" "=w")
+       (neg:V1DF (match_operand:V1DF 1 "register_operand" "w")))]
+ "TARGET_SIMD"
+ "fneg\\t%d0, %d1"
+  [(set_attr "type" "neon_fp_neg_d")]
+)
+
 (define_insn "abs<mode>2"
  [(set (match_operand:VHSDF 0 "register_operand" "=w")
        (abs:VHSDF (match_operand:VHSDF 1 "register_operand" "w")))]
diff --git a/gcc/testsuite/gcc.target/aarch64/simd/addsub_2.c b/gcc/testsuite/gcc.target/aarch64/simd/addsub_2.c
new file mode 100644
index 0000000000000000000000000000000000000000..55a7365e897f8af509de953129e0f516974f7ca8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/simd/addsub_2.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-Ofast" } */
+/* { dg-final { check-function-bodies "**" "" "" { target { le } } } } */
+
+#pragma GCC target "+nosve"
+
+/*
+** f1:
+** ...
+**	fneg	d[0-9]+, d[0-9]+
+**	fadd	v[0-9]+.2s, v[0-9]+.2s, v[0-9]+.2s
+** ...
+*/
+void f1 (float *restrict a, float *restrict b, float *res, int n)
+{
+   for (int i = 0; i < 2; i+=2)
+    {
+      res[i+0] = a[i+0] + b[i+0];
+      res[i+1] = a[i+1] - b[i+1];
+    }
+}
+




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