Hi All,

This enables the new tuning flag for Neoverse V1, Neoverse V2 and Neoverse N2.
It is kept off for generic codegen.

Note the reason for the +sve even though they are in aarch64-sve.exp is if the
testsuite is ran with a forced SVE off option, e.g. -march=armv8-a+nosve then
the intrinsics end up being disabled because the -march is preferred over the
-mcpu even though the -mcpu comes later.

This prevents the tests from failing in such runs.

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

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* config/aarch64/tuning_models/neoversen2.h (neoversen2_tunings): Add
	AARCH64_EXTRA_TUNE_AVOID_PRED_RMW.
	* config/aarch64/tuning_models/neoversev1.h (neoversev1_tunings): Add
	AARCH64_EXTRA_TUNE_AVOID_PRED_RMW.
	* config/aarch64/tuning_models/neoversev2.h (neoversev2_tunings): Add
	AARCH64_EXTRA_TUNE_AVOID_PRED_RMW.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/sve/pred_clobber_1.c: New test.
	* gcc.target/aarch64/sve/pred_clobber_2.c: New test.
	* gcc.target/aarch64/sve/pred_clobber_3.c: New test.
	* gcc.target/aarch64/sve/pred_clobber_4.c: New test.
	* gcc.target/aarch64/sve/pred_clobber_5.c: New test.

---
diff --git a/gcc/config/aarch64/tuning_models/neoversen2.h b/gcc/config/aarch64/tuning_models/neoversen2.h
index 7e799bbe762fe862e31befed50e54040a7fd1f2f..be9a48ac3adc097f967c217fe09dcac194d7d14f 100644
--- a/gcc/config/aarch64/tuning_models/neoversen2.h
+++ b/gcc/config/aarch64/tuning_models/neoversen2.h
@@ -236,7 +236,8 @@ static const struct tune_params neoversen2_tunings =
   (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND
    | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
    | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
-   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT),	/* tune_flags.  */
+   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
+   | AARCH64_EXTRA_TUNE_AVOID_PRED_RMW),	/* tune_flags.  */
   &generic_prefetch_tune,
   AARCH64_LDP_STP_POLICY_ALWAYS,   /* ldp_policy_model.  */
   AARCH64_LDP_STP_POLICY_ALWAYS	   /* stp_policy_model.  */
diff --git a/gcc/config/aarch64/tuning_models/neoversev1.h b/gcc/config/aarch64/tuning_models/neoversev1.h
index 9363f2ad98a5279cc99f2f9b1509ba921d582e84..0fc41ce6a41b3135fa06d2bda1f517fdf4f8dbcf 100644
--- a/gcc/config/aarch64/tuning_models/neoversev1.h
+++ b/gcc/config/aarch64/tuning_models/neoversev1.h
@@ -227,7 +227,8 @@ static const struct tune_params neoversev1_tunings =
   (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
    | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
    | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
-   | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND),	/* tune_flags.  */
+   | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND
+   | AARCH64_EXTRA_TUNE_AVOID_PRED_RMW),	/* tune_flags.  */
   &generic_prefetch_tune,
   AARCH64_LDP_STP_POLICY_ALWAYS,   /* ldp_policy_model.  */
   AARCH64_LDP_STP_POLICY_ALWAYS    /* stp_policy_model.  */
diff --git a/gcc/config/aarch64/tuning_models/neoversev2.h b/gcc/config/aarch64/tuning_models/neoversev2.h
index bc01ed767c9b690504eb98456402df5d9d64eee3..f76e4ef358f7dfb9c7d7b470ea7240eaa2120f8e 100644
--- a/gcc/config/aarch64/tuning_models/neoversev2.h
+++ b/gcc/config/aarch64/tuning_models/neoversev2.h
@@ -236,7 +236,8 @@ static const struct tune_params neoversev2_tunings =
   (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND
    | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
    | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
-   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT),	/* tune_flags.  */
+   | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
+   | AARCH64_EXTRA_TUNE_AVOID_PRED_RMW),	/* tune_flags.  */
   &generic_prefetch_tune,
   AARCH64_LDP_STP_POLICY_ALWAYS,   /* ldp_policy_model.  */
   AARCH64_LDP_STP_POLICY_ALWAYS	   /* stp_policy_model.  */
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_1.c b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..934a00a38531c5fd4139d99ff33414904b2c104f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_1.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=neoverse-n2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#pragma GCC target "+sve"
+
+#include <arm_sve.h>
+
+extern void use(svbool_t);
+
+/*
+** foo:
+**	...
+**	ptrue	p([1-9][0-9]?).b, all
+**	cmplo	p0.h, p\1/z, z0.h, z[0-9]+.h
+**	...
+*/
+void foo (svuint16_t a, uint16_t b)
+{
+    svbool_t p0 = svcmplt_n_u16 (svptrue_b16 (), a, b);
+    use (p0);
+}
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_2.c b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_2.c
new file mode 100644
index 0000000000000000000000000000000000000000..58badb66a43b1ac50eeec153b9cac44fc831b145
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_2.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=neoverse-v2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#pragma GCC target "+sve"
+
+#include <arm_sve.h>
+
+extern void use(svbool_t);
+
+/*
+** foo:
+**	...
+**	ptrue	p([1-9][0-9]?).b, all
+**	cmplo	p0.h, p\1/z, z0.h, z[0-9]+.h
+**	...
+*/
+void foo (svuint16_t a, uint16_t b)
+{
+    svbool_t p0 = svcmplt_n_u16 (svptrue_b16 (), a, b);
+    use (p0);
+}
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_3.c b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_3.c
new file mode 100644
index 0000000000000000000000000000000000000000..c67c2bd3422e0bb0c694b5fe0adf0d83e4d967c6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_3.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=neoverse-v1" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#pragma GCC target "+sve"
+
+#include <arm_sve.h>
+
+extern void use(svbool_t);
+
+/*
+** foo:
+**	...
+**	ptrue	p([1-9][0-9]?).b, all
+**	cmplo	p0.h, p\1/z, z0.h, z[0-9]+.h
+**	...
+*/
+void foo (svuint16_t a, uint16_t b)
+{
+    svbool_t p0 = svcmplt_n_u16 (svptrue_b16 (), a, b);
+    use (p0);
+}
+
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_4.c b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_4.c
new file mode 100644
index 0000000000000000000000000000000000000000..c0120afe5d523eff8297fadd4fc4c678676413d6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_4.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#pragma GCC target "+sve"
+
+#include <arm_sve.h>
+
+extern void use(svbool_t);
+
+/*
+** foo:
+**	...
+**	ptrue	p0.b, all
+**	cmplo	p0.h, p0/z, z0.h, z[0-9]+.h
+**	...
+*/
+void foo (svuint16_t a, uint16_t b)
+{
+    svbool_t p0 = svcmplt_n_u16 (svptrue_b16 (), a, b);
+    use (p0);
+}
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_5.c b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_5.c
new file mode 100644
index 0000000000000000000000000000000000000000..63f0669abd23d45c0ffd77c53859a098a21e0192
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pred_clobber_5.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=neoverse-n2 -ffixed-p1 -ffixed-p2 -ffixed-p3 -ffixed-p4 -ffixed-p5 -ffixed-p6 -ffixed-p7 -ffixed-p8 -ffixed-p9 -ffixed-p10 -ffixed-p11 -ffixed-p12 -ffixed-p12 -ffixed-p13 -ffixed-p14 -ffixed-p15" } */
+/* { dg-final { check-function-bodies "**" "" } } */
+
+#pragma GCC target "+sve"
+
+#include <arm_sve.h>
+
+extern void use(svbool_t);
+
+/*
+** foo:
+**	...
+**	ptrue	p0.b, all
+**	cmplo	p0.h, p0/z, z0.h, z[0-9]+.h
+**	...
+*/
+void foo (svuint16_t a, uint16_t b)
+{
+    svbool_t p0 = svcmplt_n_u16 (svptrue_b16 (), a, b);
+    use (p0);
+}




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