runtime: change sys.PtrSize to goarch.PtrSize in comments

The code was updated, the comments were not.

Change-Id: If387779f3abd5e8a1b487fe34c33dcf9ce5fa7ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/383495
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/runtime/mbarrier.go

@@ -198,7 +198,7 @@ func reflectlite_typedmemmove(typ *_type, dst, src unsafe.Pointer) {
 
 // typedmemmovepartial is like typedmemmove but assumes that
 // dst and src point off bytes into the value and only copies size bytes.
-// off must be a multiple of sys.PtrSize.
+// off must be a multiple of goarch.PtrSize.
 //go:linkname reflect_typedmemmovepartial reflect.typedmemmovepartial
 func reflect_typedmemmovepartial(typ *_type, dst, src unsafe.Pointer, off, size uintptr) {
 	if writeBarrier.needed && typ.ptrdata > off && size >= goarch.PtrSize {

src/runtime/mbitmap.go

@@ -843,7 +843,7 @@ func heapBitsSetType(x, size, dataSize uintptr, typ *_type) {
 	// size is sizeof(_defer{}) (at least 6 words) and dataSize may be
 	// arbitrarily larger.
 	//
-	// The checks for size == sys.PtrSize and size == 2*sys.PtrSize can therefore
+	// The checks for size == goarch.PtrSize and size == 2*goarch.PtrSize can therefore
 	// assume that dataSize == size without checking it explicitly.
 
 	if goarch.PtrSize == 8 && size == goarch.PtrSize {
@@ -893,7 +893,7 @@ func heapBitsSetType(x, size, dataSize uintptr, typ *_type) {
 			}
 			return
 		}
-		// Otherwise typ.size must be 2*sys.PtrSize,
+		// Otherwise typ.size must be 2*goarch.PtrSize,
 		// and typ.kind&kindGCProg == 0.
 		if doubleCheck {
 			if typ.size != 2*goarch.PtrSize || typ.kind&kindGCProg != 0 {
@@ -1095,8 +1095,8 @@ func heapBitsSetType(x, size, dataSize uintptr, typ *_type) {
 			// Replicate ptrmask to fill entire pbits uintptr.
 			// Doubling and truncating is fewer steps than
 			// iterating by nb each time. (nb could be 1.)
-			// Since we loaded typ.ptrdata/sys.PtrSize bits
-			// but are pretending to have typ.size/sys.PtrSize,
+			// Since we loaded typ.ptrdata/goarch.PtrSize bits
+			// but are pretending to have typ.size/goarch.PtrSize,
 			// there might be no replication necessary/possible.
 			pbits = b
 			endnb = nb
@@ -1564,7 +1564,7 @@ func heapBitsSetTypeGCProg(h heapBits, progSize, elemSize, dataSize, allocSize u
 
 // progToPointerMask returns the 1-bit pointer mask output by the GC program prog.
 // size the size of the region described by prog, in bytes.
-// The resulting bitvector will have no more than size/sys.PtrSize bits.
+// The resulting bitvector will have no more than size/goarch.PtrSize bits.
 func progToPointerMask(prog *byte, size uintptr) bitvector {
 	n := (size/goarch.PtrSize + 7) / 8
 	x := (*[1 << 30]byte)(persistentalloc(n+1, 1, &memstats.buckhash_sys))[:n+1]
@@ -1697,7 +1697,7 @@ Run:
 		// into a register and use that register for the entire loop
 		// instead of repeatedly reading from memory.
 		// Handling fewer than 8 bits here makes the general loop simpler.
-		// The cutoff is sys.PtrSize*8 - 7 to guarantee that when we add
+		// The cutoff is goarch.PtrSize*8 - 7 to guarantee that when we add
 		// the pattern to a bit buffer holding at most 7 bits (a partial byte)
 		// it will not overflow.
 		src := dst

src/runtime/slice.go

@@ -214,7 +214,7 @@ func growslice(et *_type, old slice, cap int) slice {
 	var lenmem, newlenmem, capmem uintptr
 	// Specialize for common values of et.size.
 	// For 1 we don't need any division/multiplication.
-	// For sys.PtrSize, compiler will optimize division/multiplication into a shift by a constant.
+	// For goarch.PtrSize, compiler will optimize division/multiplication into a shift by a constant.
 	// For powers of 2, use a variable shift.
 	switch {
 	case et.size == 1:

src/runtime/symtab.go

@@ -863,7 +863,7 @@ type pcvalueCacheEnt struct {
 
 // pcvalueCacheKey returns the outermost index in a pcvalueCache to use for targetpc.
 // It must be very cheap to calculate.
-// For now, align to sys.PtrSize and reduce mod the number of entries.
+// For now, align to goarch.PtrSize and reduce mod the number of entries.
 // In practice, this appears to be fairly randomly and evenly distributed.
 func pcvalueCacheKey(targetpc uintptr) uintptr {
 	return (targetpc / goarch.PtrSize) % uintptr(len(pcvalueCache{}.entries))

src/runtime/syscall_windows.go

@@ -152,7 +152,7 @@ func (p *abiDesc) assignArg(t *_type) {
 // tryRegAssignArg tries to register-assign a value of type t.
 // If this type is nested in an aggregate type, then offset is the
 // offset of this type within its parent type.
-// Assumes t.size <= sys.PtrSize and t.size != 0.
+// Assumes t.size <= goarch.PtrSize and t.size != 0.
 //
 // Returns whether the assignment succeeded.
 func (p *abiDesc) tryRegAssignArg(t *_type, offset uintptr) bool {