projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d38cd08c UD |
1 | /* |
| 2 | * Written by J.T. Conklin <jtc@netbsd.org>. | |
| 3 | * Public domain. | |
| 4 | * Adapted for float type by Ulrich Drepper <drepper@cygnus.com>. | |
| d705269e UD |
5 | * |
| 6 | * Correct handling of y==-inf <drepper@gnu> | |
| d38cd08c UD |
7 | */ |
| 8 | ||
| 9 | #include <machine/asm.h> | |
| 10 | ||
| d705269e UD |
11 | #ifdef __ELF__ |
| 12 | .section .rodata | |
| 13 | #else | |
| 14 | .text | |
| 15 | #endif | |
| 16 | ||
| 17 | .align ALIGNARG(4) | |
| 18 | ASM_TYPE_DIRECTIVE(zero_nan,@object) | |
| 19 | zero_nan: | |
| 20 | .double 0.0 | |
| 21 | nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f | |
| d705269e UD |
22 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 |
| 23 | .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f | |
| 24 | ASM_SIZE_DIRECTIVE(zero_nan) | |
| 25 | ||
| 26 | ||
| 27 | #ifdef PIC | |
| 0ac5ae23 UD |
28 | # define MO(op) op##@GOTOFF(%ecx) |
| 29 | # define MOX(op,x,f) op##@GOTOFF(%ecx,x,f) | |
| d705269e | 30 | #else |
| 0ac5ae23 UD |
31 | # define MO(op) op |
| 32 | # define MOX(op,x,f) op(,x,f) | |
| d705269e UD |
33 | #endif |
| 34 | ||
| 35 | ||
| 36 | .text | |
| d38cd08c UD |
37 | ENTRY(__ieee754_scalbf) |
| 38 | flds 8(%esp) | |
| d705269e UD |
39 | fxam |
| 40 | fnstsw | |
| d38cd08c | 41 | flds 4(%esp) |
| d705269e UD |
42 | andl $0x4700, %eax |
| 43 | cmpl $0x0700, %eax | |
| 44 | je 1f | |
| 45 | andl $0x4500, %eax | |
| 46 | cmpl $0x0100, %eax | |
| 47 | je 2f | |
| 48 | fxam | |
| 49 | fnstsw | |
| 50 | andl $0x4500, %eax | |
| 51 | cmpl $0x0100, %eax | |
| 6d0c4914 | 52 | je 3f |
| d705269e UD |
53 | fld %st(1) |
| 54 | frndint | |
| 55 | fcomp %st(2) | |
| 56 | fnstsw | |
| 57 | sahf | |
| e208f556 | 58 | jne 4f |
| d38cd08c | 59 | fscale |
| 3e5f5557 | 60 | fstp %st(1) |
| d38cd08c | 61 | ret |
| d705269e UD |
62 | |
| 63 | /* y is -inf */ | |
| 64 | 1: fxam | |
| 65 | #ifdef PIC | |
| fee732e5 | 66 | LOAD_PIC_REG (cx) |
| d705269e UD |
67 | #endif |
| 68 | fnstsw | |
| 69 | movl 4(%esp), %edx | |
| 70 | shrl $5, %eax | |
| 2827300f UD |
71 | fstp %st |
| 72 | fstp %st | |
| d705269e UD |
73 | andl $0x80000000, %edx |
| 74 | andl $8, %eax | |
| e208f556 | 75 | jnz 4f |
| d705269e UD |
76 | shrl $27, %edx |
| 77 | addl %edx, %eax | |
| 78 | fldl MOX(zero_nan, %eax, 1) | |
| 79 | ret | |
| 80 | ||
| 81 | /* The result is NaN, but we must not raise an exception. | |
| 82 | So use a variable. */ | |
| 83 | 2: fstp %st | |
| 84 | fstp %st | |
| 85 | #ifdef PIC | |
| fee732e5 | 86 | LOAD_PIC_REG (cx) |
| d705269e UD |
87 | #endif |
| 88 | fldl MO(nan) | |
| 89 | ret | |
| 6d0c4914 UD |
90 | |
| 91 | /* The first parameter is a NaN. Return it. */ | |
| 92 | 3: fstp %st(1) | |
| 93 | ret | |
| e208f556 UD |
94 | |
| 95 | /* Return NaN and raise the invalid exception. */ | |
| 96 | 4: fstp %st | |
| 97 | fstp %st | |
| 98 | fldz | |
| 99 | fdiv %st | |
| 100 | ret | |
| d38cd08c | 101 | END(__ieee754_scalbf) |
| 0ac5ae23 | 102 | strong_alias (__ieee754_scalbf, __scalbf_finite) |