8253040: Remove unused Matcher::regnum_to_fpu_offset()

Reviewed-by: adityam, vlivanov

src/hotspot/cpu/aarch64/aarch64.ad

@@ -2410,12 +2410,6 @@ const int Matcher::float_pressure(int default_pressure_threshold) {
   return default_pressure_threshold;
 }
 
-int Matcher::regnum_to_fpu_offset(int regnum)
-{
-  Unimplemented();
-  return 0;
-}
-
 // Is this branch offset short enough that a short branch can be used?
 //
 // NOTE: If the platform does not provide any short branch variants, then

src/hotspot/cpu/arm/arm.ad

@@ -997,10 +997,6 @@ const int Matcher::float_pressure(int default_pressure_threshold) {
   return default_pressure_threshold;
 }
 
-int Matcher::regnum_to_fpu_offset(int regnum) {
-  return regnum - 32; // The FP registers are in the second chunk
-}
-
 // Vector width in bytes
 const int Matcher::vector_width_in_bytes(BasicType bt) {
   return MaxVectorSize;

src/hotspot/cpu/ppc/ppc.ad

@@ -2165,12 +2165,6 @@ const int Matcher::float_pressure(int default_pressure_threshold) {
   return default_pressure_threshold;
 }
 
-int Matcher::regnum_to_fpu_offset(int regnum) {
-  // No user for this method?
-  Unimplemented();
-  return 999;
-}
-
 const bool Matcher::convL2FSupported(void) {
   // fcfids can do the conversion (>= Power7).
   // fcfid + frsp showed rounding problem when result should be 0x3f800001.

src/hotspot/cpu/s390/s390.ad

@@ -1569,11 +1569,6 @@ const bool Matcher::match_rule_supported_vector(int opcode, int vlen, BasicType
   return ret_value;  // Per default match rules are supported.
 }
 
-int Matcher::regnum_to_fpu_offset(int regnum) {
-  ShouldNotReachHere();
-  return regnum - 32; // The FP registers are in the second chunk.
-}
-
 const bool Matcher::has_predicated_vectors(void) {
   return false;
 }

src/hotspot/cpu/x86/x86_32.ad

@@ -1371,10 +1371,6 @@ uint MachUEPNode::size(PhaseRegAlloc *ra_) const {
 
 //=============================================================================
 
-int Matcher::regnum_to_fpu_offset(int regnum) {
-  return regnum - 32; // The FP registers are in the second chunk
-}
-
 // This is UltraSparc specific, true just means we have fast l2f conversion
 const bool Matcher::convL2FSupported(void) {
   return true;

src/hotspot/cpu/x86/x86_64.ad

@@ -1578,11 +1578,6 @@ uint MachUEPNode::size(PhaseRegAlloc* ra_) const
 
 //=============================================================================
 
-int Matcher::regnum_to_fpu_offset(int regnum)
-{
-  return regnum - 32; // The FP registers are in the second chunk
-}
-
 // This is UltraSparc specific, true just means we have fast l2f conversion
 const bool Matcher::convL2FSupported(void) {
   return true;

src/hotspot/share/opto/matcher.hpp

@@ -437,9 +437,6 @@ class Matcher : public PhaseTransform {
   OptoReg::Name  c_frame_pointer() const;
   static RegMask c_frame_ptr_mask;
 
-  // !!!!! Special stuff for building ScopeDescs
-  virtual int      regnum_to_fpu_offset(int regnum);
-
   // Is this branch offset small enough to be addressed by a short branch?
   bool is_short_branch_offset(int rule, int br_size, int offset);