diff options
Diffstat (limited to 'winsup/cygwin/math/exp2l.S')
| -rw-r--r-- | winsup/cygwin/math/exp2l.S | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/winsup/cygwin/math/exp2l.S b/winsup/cygwin/math/exp2l.S new file mode 100644 index 000000000..2e58c37b8 --- /dev/null +++ b/winsup/cygwin/math/exp2l.S @@ -0,0 +1,92 @@ +/** + * This file has no copyright assigned and is placed in the Public Domain. + * This file is part of the mingw-w64 runtime package. + * No warranty is given; refer to the file DISCLAIMER.PD within this package. + */ +#include <_mingw_mac.h> + + .file "exp2l.S" + .text +#ifdef __x86_64__ + .align 8 +#else + .align 4 +#endif +.globl __MINGW_USYMBOL(exp2l) + .def __MINGW_USYMBOL(exp2l); .scl 2; .type 32; .endef +__MINGW_USYMBOL(exp2l): +#ifdef __x86_64__ + fldt (%rdx) + fxam /* Is NaN or +-Inf? */ + fstsw %ax + movb $0x45, %dh + andb %ah, %dh + cmpb $0x05, %dh + je 1f /* Is +-Inf, jump. */ + fld %st + subq $8, %rsp /* int(x) */ + fnstcw 4(%rsp) + movzwl 4(%rsp), %eax + orb $12, %ah + movw %ax, (%rsp) + fldcw (%rsp) + frndint + fldcw 4(%rsp) + addq $8, %rsp + fsubr %st,%st(1) /* fract(x) */ + fxch + f2xm1 /* 2^(fract(x)) - 1 */ + fld1 + faddp /* 2^(fract(x)) */ + fscale /* e^x */ + fstp %st(1) + movq %rcx,%rax + movq $0,8(%rcx) + fstpt (%rcx) + ret + +1: testl $0x200, %eax /* Test sign. */ + jz 2f /* If positive, jump. */ + fstp %st + fldz /* Set result to 0. */ +2: movq %rcx,%rax + movq $0,8(%rcx) + fstpt (%rcx) + ret +#else + fldt 4(%esp) +/* I added the following ugly construct because exp(+-Inf) resulted + in NaN. The ugliness results from the bright minds at Intel. + For the i686 the code can be written better. + -- drepper@cygnus.com. */ + fxam /* Is NaN or +-Inf? */ + fstsw %ax + movb $0x45, %dh + andb %ah, %dh + cmpb $0x05, %dh + je 1f /* Is +-Inf, jump. */ + fld %st + subl $8, %esp /* int(x) */ + fnstcw 4(%esp) + movzwl 4(%esp), %eax + orb $12, %ah + movw %ax, (%esp) + fldcw (%esp) + frndint + fldcw 4(%esp) + addl $8, %esp + fsubr %st,%st(1) /* fract(x) */ + fxch + f2xm1 /* 2^(fract(x)) - 1 */ + fld1 + faddp /* 2^(fract(x)) */ + fscale /* e^x */ + fstp %st(1) + ret + +1: testl $0x200, %eax /* Test sign. */ + jz 2f /* If positive, jump. */ + fstp %st + fldz /* Set result to 0. */ +2: ret +#endif |