diff options
Diffstat (limited to 'winsup/mingw/mingwex/math/ilogb.S')
| -rw-r--r-- | winsup/mingw/mingwex/math/ilogb.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/ilogb.S b/winsup/mingw/mingwex/math/ilogb.S new file mode 100644 index 000000000..2335b5146 --- /dev/null +++ b/winsup/mingw/mingwex/math/ilogb.S @@ -0,0 +1,37 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + + + .file "ilogb.S" + .text + .align 4 +.globl _ilogb + .def _ilogb; .scl 2; .type 32; .endef +_ilogb: + + fldl 4(%esp) +/* I added the following ugly construct because ilogb(+-Inf) is + required to return INT_MAX in ISO C99. + -- jakub@redhat.com. */ + fxam /* Is NaN or +-Inf? */ + fstsw %ax + movb $0x45, %dh + andb %ah, %dh + cmpb $0x05, %dh + je 1f /* Is +-Inf, jump. */ + + fxtract + pushl %eax + fstp %st + + fistpl (%esp) + fwait + popl %eax + + ret + +1: fstp %st + movl $0x7fffffff, %eax + ret |