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Diffstat (limited to 'winsup/cygwin/math/log10l.S')
| -rw-r--r-- | winsup/cygwin/math/log10l.S | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/winsup/cygwin/math/log10l.S b/winsup/cygwin/math/log10l.S new file mode 100644 index 0000000..33d45a3 --- /dev/null +++ b/winsup/cygwin/math/log10l.S @@ -0,0 +1,93 @@ +/** + * 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 "log10l.S" + .text +#ifdef __x86_64__ + .align 8 +#else + .align 4 +#endif +one: .double 1.0 + /* It is not important that this constant is precise. It is only + a value which is known to be on the safe side for using the + fyl2xp1 instruction. */ +limit: .double 0.29 + + .text +#ifdef __x86_64__ + .align 8 +#else + .align 4 +#endif +.globl __MINGW_USYMBOL(log10l) + .def __MINGW_USYMBOL(log10l); .scl 2; .type 32; .endef +__MINGW_USYMBOL(log10l): +#ifdef __x86_64__ + fldlg2 // log10(2) + fldt (%rdx) // x : log10(2) + fxam + fnstsw + fld %st // x : x : log10(2) + sahf + jc 3f // in case x is NaN or ħInf +4: fsubl one(%rip) // x-1 : x : log10(2) + fld %st // x-1 : x-1 : x : log10(2) + fabs // |x-1| : x-1 : x : log10(2) + fcompl limit(%rip) // x-1 : x : log10(2) + fnstsw // x-1 : x : log10(2) + andb $0x45, %ah + jz 2f + fstp %st(1) // x-1 : log10(2) + fyl2xp1 // log10(x) + movq %rcx,%rax + movq $0,8(%rcx) + fstpt (%rcx) + ret + +2: fstp %st(0) // x : log10(2) + fyl2x // log10(x) + movq %rcx,%rax + movq $0,8(%rcx) + fstpt (%rcx) + ret + +3: jp 4b // in case x is ħInf + fstp %st(1) + fstp %st(1) + movq %rcx,%rax + movq $0,8(%rcx) + fstpt (%rcx) + ret +#else + fldlg2 // log10(2) + fldt 4(%esp) // x : log10(2) + fxam + fnstsw + fld %st // x : x : log10(2) + sahf + jc 3f // in case x is NaN or ħInf +4: fsubl one // x-1 : x : log10(2) + fld %st // x-1 : x-1 : x : log10(2) + fabs // |x-1| : x-1 : x : log10(2) + fcompl limit // x-1 : x : log10(2) + fnstsw // x-1 : x : log10(2) + andb $0x45, %ah + jz 2f + fstp %st(1) // x-1 : log10(2) + fyl2xp1 // log10(x) + ret + +2: fstp %st(0) // x : log10(2) + fyl2x // log10(x) + ret + +3: jp 4b // in case x is ħInf + fstp %st(1) + fstp %st(1) + ret +#endif |