[PATCH 1/9] target/arm: Add isar feature check functions for MVE

[Peter Maydell <peter.maydell@linaro.org>]

Add the isar feature check functions we will need for v8.1M MVE:
 * a check for MVE present: this corresponds to the pseudocode's
   CheckDecodeFaults(ExtType_Mve)
 * a check for the optional floating-point part of MVE: this
   corresponds to CheckDecodeFaults(ExtType_MveFp)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/cpu.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 616b3932534..d037f5530fc 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3801,6 +3801,28 @@ static inline bool isar_feature_aa32_fp16_arith(const ARMISARegisters *id)
     }
 }
 
+static inline bool isar_feature_aa32_mve(const ARMISARegisters *id)
+{
+    /*
+     * Return true if MVE is supported (either integer or floating point).
+     * We must check for M-profile as the MVFR1 field means something
+     * else for A-profile.
+     */
+    return isar_feature_aa32_mprofile(id) &&
+        FIELD_EX32(id->mvfr1, MVFR1, MVE) > 0;
+}
+
+static inline bool isar_feature_aa32_mve_fp(const ARMISARegisters *id)
+{
+    /*
+     * Return true if MVE is supported (either integer or floating point).
+     * We must check for M-profile as the MVFR1 field means something
+     * else for A-profile.
+     */
+    return isar_feature_aa32_mprofile(id) &&
+        FIELD_EX32(id->mvfr1, MVFR1, MVE) >= 2;
+}
+
 static inline bool isar_feature_aa32_vfp_simd(const ARMISARegisters *id)
 {
     /*
-- 
2.20.1