revert pull #266

Author: WalterBright

src/core/bitop.d

@@ -15,7 +15,6 @@
 module core.bitop;
 
 nothrow:
-@safe:
 
 version( D_InlineAsm_X86_64 )
     version = AsmX86;
@@ -39,7 +38,7 @@ else version( D_InlineAsm_X86 )
  * }
  * ---
  */
-int bsf(size_t v) pure;
+pure int bsf(size_t v);
 
 unittest
 {
@@ -64,7 +63,7 @@ unittest
  * }
  * ---
  */
-int bsr(size_t v) pure;
+pure int bsr(size_t v);
 
 unittest
 {
@@ -74,19 +73,19 @@ unittest
 /**
  * Tests the bit.
  */
-int bt(in size_t* p, size_t bitnum) pure;
+pure int bt(in size_t* p, size_t bitnum);
 
 
 /**
  * Tests and complements the bit.
  */
-int btc(size_t* p, size_t bitnum) pure;
+int btc(size_t* p, size_t bitnum);
 
 
 /**
  * Tests and resets (sets to 0) the bit.
  */
-int btr(size_t* p, size_t bitnum) pure;
+int btr(size_t* p, size_t bitnum);
 
 
 /**
@@ -138,7 +137,7 @@ int main()
 }
  * ---
  */
-int bts(size_t* p, size_t bitnum) pure;
+int bts(size_t* p, size_t bitnum);
 
 unittest
 {
@@ -189,51 +188,49 @@ unittest
  * byte 3, byte 1 becomes byte 2, byte 2 becomes byte 1, byte 3
  * becomes byte 0.
  */
-uint bswap(uint v) pure;
+pure uint bswap(uint v);
 
-@system // not pure
-{
-    /**
-     * Reads I/O port at port_address.
-     */
-    ubyte inp(uint port_address);
 
+/**
+ * Reads I/O port at port_address.
+ */
+ubyte inp(uint port_address);
 
-    /**
-     * ditto
-     */
-    ushort inpw(uint port_address);
 
+/**
+ * ditto
+ */
+ushort inpw(uint port_address);
 
-    /**
-     * ditto
-     */
-    uint inpl(uint port_address);
 
+/**
+ * ditto
+ */
+uint inpl(uint port_address);
 
-    /**
-     * Writes and returns value to I/O port at port_address.
-     */
-    ubyte outp(uint port_address, ubyte value);
 
+/**
+ * Writes and returns value to I/O port at port_address.
+ */
+ubyte outp(uint port_address, ubyte value);
 
-    /**
-     * ditto
-     */
-    ushort outpw(uint port_address, ushort value);
 
+/**
+ * ditto
+ */
+ushort outpw(uint port_address, ushort value);
 
-    /**
-     * ditto
-     */
-    uint outpl(uint port_address, uint value);
-}
+
+/**
+ * ditto
+ */
+uint outpl(uint port_address, uint value);
 
 
 /**
  *  Calculates the number of set bits in a 32-bit integer.
  */
-int popcnt( uint x ) pure
+pure int popcnt( uint x )
 {
     // Avoid branches, and the potential for cache misses which
     // could be incurred with a table lookup.
@@ -280,7 +277,7 @@ unittest
 /**
  * Reverses the order of bits in a 32-bit integer.
  */
-@trusted uint bitswap( uint x ) pure
+pure uint bitswap( uint x )
 {
     version (AsmX86)
     {