File: asm-bsr.m4

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AC_DEFUN([ACX_ASM_BSR], [
AC_LANG_SAVE
AC_LANG(C)

AC_MSG_CHECKING(for bsr instruction in assembly)
AC_RUN_IFELSE(
  [AC_LANG_PROGRAM([[ ]],
                   [[int msb; unsigned int x = rand(); asm("bsr %1,%0" : "=r"(msb) : "r"(x));]])],
  [AC_MSG_RESULT(yes)
   AC_DEFINE([HAVE_ASM_BSR],[1],[Define to 1 if bsr command is available in assembly])],
  [AC_MSG_RESULT(no)])

AC_LANG_RESTORE
])