Improved code generation

src/build/cpu/CPU.go

@@ -7,34 +7,34 @@ type CPU struct {
 	Syscall  []Register
 	Input    []Register
 	Output   []Register
-	reserved uint64
-	used     uint64
+	Reserved uint64
+	Used     uint64
 }
 
 // Free will reset the reserved and used status which means the register can be allocated again.
 func (c *CPU) Free(reg Register) {
-	c.used &= ^(1 << reg)
-	c.reserved &= ^(1 << reg)
+	c.Used &= ^(1 << reg)
+	c.Reserved &= ^(1 << reg)
 }
 
 // IsReserved returns true if the register was marked for future use.
 func (c *CPU) IsReserved(reg Register) bool {
-	return c.reserved&(1<<reg) != 0
+	return c.Reserved&(1<<reg) != 0
 }
 
 // IsUsed returns true if the register is currently in use and holds a value.
 func (c *CPU) IsUsed(reg Register) bool {
-	return c.used&(1<<reg) != 0
+	return c.Used&(1<<reg) != 0
 }
 
 // Reserve reserves a register for future use.
 func (c *CPU) Reserve(reg Register) {
-	c.reserved |= (1 << reg)
+	c.Reserved |= (1 << reg)
 }
 
 // Use marks a register to be currently in use which means it must be preserved across function calls.
 func (c *CPU) Use(reg Register) {
-	c.used |= (1 << reg)
+	c.Used |= (1 << reg)
 }
 
 // FindFree tries to find a free register in the given slice of registers.