8329254: optimize integral reverse operations on x86 GFNI target.

Reviewed-by: sviswanathan

Author: Jatin Bhateja

src/hotspot/cpu/x86/vm_version_x86.cpp

@@ -2951,6 +2951,8 @@ uint64_t VM_Version::CpuidInfo::feature_flags() const {
       if (sef_cpuid7_ecx1_eax.bits.avx_ifma != 0)
         result |= CPU_AVX_IFMA;
     }
+    if (sef_cpuid7_ecx.bits.gfni != 0)
+        result |= CPU_GFNI;
     if (sef_cpuid7_ebx.bits.avx512f != 0 &&
         xem_xcr0_eax.bits.opmask != 0 &&
         xem_xcr0_eax.bits.zmm512 != 0 &&
@@ -2976,8 +2978,6 @@ uint64_t VM_Version::CpuidInfo::feature_flags() const {
         result |= CPU_AVX512_VPCLMULQDQ;
       if (sef_cpuid7_ecx.bits.vaes != 0)
         result |= CPU_AVX512_VAES;
-      if (sef_cpuid7_ecx.bits.gfni != 0)
-        result |= CPU_GFNI;
       if (sef_cpuid7_ecx.bits.avx512_vnni != 0)
         result |= CPU_AVX512_VNNI;
       if (sef_cpuid7_ecx.bits.avx512_bitalg != 0)

src/hotspot/cpu/x86/x86_64.ad

@@ -5662,7 +5662,7 @@ instruct bytes_reversebit_int(rRegI dst, rRegI src, rRegI rtmp, rFlagsReg cr) %{
   ins_pipe( ialu_reg );
 %}
 
-instruct bytes_reversebit_int_gfni(rRegI dst, rRegI src, regF xtmp1, regF xtmp2, rRegL rtmp, rFlagsReg cr) %{
+instruct bytes_reversebit_int_gfni(rRegI dst, rRegI src, vlRegF xtmp1, vlRegF xtmp2, rRegL rtmp, rFlagsReg cr) %{
   predicate(VM_Version::supports_gfni());
   match(Set dst (ReverseI src));
   effect(TEMP dst, TEMP xtmp1, TEMP xtmp2, TEMP rtmp, KILL cr);
@@ -5684,7 +5684,7 @@ instruct bytes_reversebit_long(rRegL dst, rRegL src, rRegL rtmp1, rRegL rtmp2, r
   ins_pipe( ialu_reg );
 %}
 
-instruct bytes_reversebit_long_gfni(rRegL dst, rRegL src, regD xtmp1, regD xtmp2, rRegL rtmp, rFlagsReg cr) %{
+instruct bytes_reversebit_long_gfni(rRegL dst, rRegL src, vlRegD xtmp1, vlRegD xtmp2, rRegL rtmp, rFlagsReg cr) %{
   predicate(VM_Version::supports_gfni());
   match(Set dst (ReverseL src));
   effect(TEMP dst, TEMP xtmp1, TEMP xtmp2, TEMP rtmp, KILL cr);