diff options
| author | Danny Smith <dannysmith@users.sourceforge.net> | 2002-07-29 07:00:10 +0400 |
|---|---|---|
| committer | Danny Smith <dannysmith@users.sourceforge.net> | 2002-07-29 07:00:10 +0400 |
| commit | b8cdc234c67d883b7e9d6e4caf4ba15972ac7788 (patch) | |
| tree | e45d96d2d976020ad018e6e919bbeae2500e884a /winsup/mingw/mingwex/math/ilogbf.S | |
| parent | 840e611264ac6ad7d41bc0b275945f50067cda50 (diff) | |
Add incomplet long double math support to libmingwex.a
Diffstat (limited to 'winsup/mingw/mingwex/math/ilogbf.S')
| -rw-r--r-- | winsup/mingw/mingwex/math/ilogbf.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/ilogbf.S b/winsup/mingw/mingwex/math/ilogbf.S new file mode 100644 index 000000000..fa3e78e84 --- /dev/null +++ b/winsup/mingw/mingwex/math/ilogbf.S @@ -0,0 +1,35 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + + .file "ilogbf.S" + .text + .align 4 +.globl _ilogbf + .def _ilogbf; .scl 2; .type 32; .endef +_ilogbf: + flds 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 |