Adapt JDK-8342103: C2 compiler support for Float16 type and associated operations

Author: mur47x111

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/amd64/AMD64LibCHelper.java

@@ -310,6 +310,10 @@ public interface CPUFeatures extends PointerBase {
         @AllowNarrowingCast
         @CField
         boolean fSHA512();
+
+        @AllowNarrowingCast
+        @CField
+        boolean fAVX512_FP16();
     }
     // Checkstyle: resume
 }

substratevm/src/com.oracle.svm.native.libchelper/include/amd64cpufeatures.h

@@ -88,4 +88,5 @@ typedef struct {
   uint8_t fAVX_IFMA;
   uint8_t fAPX_F;
   uint8_t fSHA512;
+  uint8_t fAVX512_FP16;
 } CPUFeatures;

substratevm/src/com.oracle.svm.native.libchelper/include/amd64hotspotcpuinfo.h

@@ -267,7 +267,9 @@ typedef union {
                serialize : 1,
                          : 5,
                  cet_ibt : 1,
-                         : 11;
+                         : 2,
+            avx512_fp16  : 1,
+                         : 8;
   } bits;
 } SefCpuid7Edx;
 

substratevm/src/com.oracle.svm.native.libchelper/src/cpuid.c

@@ -547,6 +547,9 @@ NO_INLINE static void set_cpufeatures(CPUFeatures *features, CpuidInfo *_cpuid_i
     if (_cpuid_info->sef_cpuid7_edx.bits.serialize != 0) {
       features->fSERIALIZE = 1;
     }
+    if (_cpuid_info->sef_cpuid7_edx.bits.avx512_fp16 != 0) {
+      features->fAVX512_FP16 = 1;
+    }
   }
 
   // ZX features.