git://sourceware.org / newlib-cygwin.git / blame
| Commit | Line | Data |
|---|---|---|
| 792e51b7 CV |
1 | /** |
| 2 | * This file has no copyright assigned and is placed in the Public Domain. | |
| 3 | * This file is part of the mingw-w64 runtime package. | |
| 4 | * No warranty is given; refer to the file DISCLAIMER.PD within this package. | |
| 5 | */ | |
| 6 | #include <_mingw_mac.h> | |
| 7 | ||
| 8 | .file "exp2.S" | |
| 9 | .text | |
| 10 | #ifdef __x86_64__ | |
| 11 | .align 8 | |
| 12 | #else | |
| 13 | .align 4 | |
| 14 | #endif | |
| 15 | .globl __MINGW_USYMBOL(exp2) | |
| 16 | .def __MINGW_USYMBOL(exp2); .scl 2; .type 32; .endef | |
| 17 | __MINGW_USYMBOL(exp2): | |
| 18 | #ifdef __x86_64__ | |
| 19 | subq $24, %rsp | |
| 20 | movsd %xmm0,(%rsp) | |
| 21 | fldl (%rsp) | |
| 22 | fxam /* Is NaN or +-Inf? */ | |
| 23 | fstsw %ax | |
| 24 | movb $0x45, %dh | |
| 25 | andb %ah, %dh | |
| 26 | cmpb $0x05, %dh | |
| 27 | je 1f /* Is +-Inf, jump. */ | |
| 28 | fld %st | |
| d2ef2331 CV |
29 | subq $8, %rsp /* int(x) */ |
| 30 | fnstcw 4(%rsp) | |
| 31 | movzwl 4(%rsp), %eax | |
| 32 | orb $12, %ah | |
| 33 | movw %ax, (%rsp) | |
| 34 | fldcw (%rsp) | |
| 35 | frndint | |
| 36 | fldcw 4(%rsp) | |
| 37 | addq $8, %rsp | |
| 792e51b7 CV |
38 | fsubr %st,%st(1) /* fract(x) */ |
| 39 | fxch | |
| 40 | f2xm1 /* 2^(fract(x)) - 1 */ | |
| 41 | fld1 | |
| 42 | faddp /* 2^(fract(x)) */ | |
| 43 | fscale /* e^x */ | |
| 44 | fstp %st(1) | |
| 45 | fstpl (%rsp) | |
| 46 | movsd (%rsp),%xmm0 | |
| 47 | addq $24, %rsp | |
| 48 | ret | |
| 49 | ||
| 50 | 1: testl $0x200, %eax /* Test sign. */ | |
| 51 | jz 2f /* If positive, jump. */ | |
| 52 | fstp %st | |
| 53 | fldz /* Set result to 0. */ | |
| 54 | 2: fstpl (%rsp) | |
| 55 | movsd (%rsp),%xmm0 | |
| 56 | addq $24,%rsp | |
| 57 | ret | |
| 58 | #else | |
| 59 | fldl 4(%esp) | |
| 60 | /* I added the following ugly construct because exp(+-Inf) resulted | |
| 61 | in NaN. The ugliness results from the bright minds at Intel. | |
| 62 | For the i686 the code can be written better. | |
| 63 | -- drepper@cygnus.com. */ | |
| 64 | fxam /* Is NaN or +-Inf? */ | |
| 65 | fstsw %ax | |
| 66 | movb $0x45, %dh | |
| 67 | andb %ah, %dh | |
| 68 | cmpb $0x05, %dh | |
| 69 | je 1f /* Is +-Inf, jump. */ | |
| 70 | fld %st | |
| 71 | subl $8, %esp /* int(x) */ | |
| 72 | fnstcw 4(%esp) | |
| 73 | movzwl 4(%esp), %eax | |
| 74 | orb $12, %ah | |
| 75 | movw %ax, (%esp) | |
| 76 | fldcw (%esp) | |
| 77 | frndint | |
| 78 | fldcw 4(%esp) | |
| 79 | addl $8, %esp | |
| 80 | fsubr %st,%st(1) /* fract(x) */ | |
| 81 | fxch | |
| 82 | f2xm1 /* 2^(fract(x)) - 1 */ | |
| 83 | fld1 | |
| 84 | faddp /* 2^(fract(x)) */ | |
| 85 | fscale /* e^x */ | |
| 86 | fstp %st(1) | |
| 87 | ret | |
| 88 | ||
| 89 | 1: testl $0x200, %eax /* Test sign. */ | |
| 90 | jz 2f /* If positive, jump. */ | |
| 91 | fstp %st | |
| 92 | fldz /* Set result to 0. */ | |
| 93 | 2: ret | |
| 94 | #endif |