sys/conf/kern-i386.mk

   1 # $DragonFly: src/sys/conf/Attic/kern-i386.mk,v 1.2 2006/07/02 00:57:14 corecode Exp $
   2 #
   3 # On the i386, do not align the stack to 16-byte boundaries.  Otherwise GCC
   4 # adds code to the entry and exit point of every function to align the
   5 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
   6 # per function call.  While the 16-byte alignment may benefit micro benchmarks,
   7 # it is probably an overall loss as it makes the code bigger (less efficient
   8 # use of code cache tag lines) and uses more stack (less efficient use of data
   9 # cache tag lines)
  10 #
  11 # Prohibit the use of FP registers in the kernel.  The user FP state is
  12 # only saved and restored under strictly managed conditions and mainline
  13 # kernel code cannot safely use the FP system.
  14 #
  15 CFLAGS+=        -mpreferred-stack-boundary=2
  16 CFLAGS+=        -fno-stack-protector
  17 CFLAGS+=        -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3
  18
  19 INLINE_LIMIT=   8000