projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d38cd08c | 1 | /* |
| d38cd08c | 2 | * Public domain. |
| d38cd08c UD |
3 | */ |
| 4 | ||
| 5 | #include <machine/asm.h> | |
| 94ced920 | 6 | #include <i386-math-asm.h> |
| 220622dd | 7 | #include <libm-alias-finite.h> |
| d38cd08c | 8 | |
| d705269e | 9 | .section .rodata |
| d705269e UD |
10 | |
| 11 | .align ALIGNARG(4) | |
| b67e9372 | 12 | .type zero_nan,@object |
| d705269e UD |
13 | zero_nan: |
| 14 | .double 0.0 | |
| 15 | nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f | |
| d705269e UD |
16 | .byte 0, 0, 0, 0, 0, 0, 0, 0x80 |
| 17 | .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f | |
| 18 | ASM_SIZE_DIRECTIVE(zero_nan) | |
| 19 | ||
| 20 | ||
| 21 | #ifdef PIC | |
| 0ac5ae23 UD |
22 | # define MO(op) op##@GOTOFF(%ecx) |
| 23 | # define MOX(op,x,f) op##@GOTOFF(%ecx,x,f) | |
| d705269e | 24 | #else |
| 0ac5ae23 UD |
25 | # define MO(op) op |
| 26 | # define MOX(op,x,f) op(,x,f) | |
| d705269e UD |
27 | #endif |
| 28 | ||
| 29 | ||
| 30 | .text | |
| d38cd08c UD |
31 | ENTRY(__ieee754_scalbf) |
| 32 | flds 8(%esp) | |
| d705269e UD |
33 | fxam |
| 34 | fnstsw | |
| d38cd08c | 35 | flds 4(%esp) |
| d705269e UD |
36 | andl $0x4700, %eax |
| 37 | cmpl $0x0700, %eax | |
| 38 | je 1f | |
| 39 | andl $0x4500, %eax | |
| 40 | cmpl $0x0100, %eax | |
| 41 | je 2f | |
| 42 | fxam | |
| 43 | fnstsw | |
| 44 | andl $0x4500, %eax | |
| 45 | cmpl $0x0100, %eax | |
| 6d0c4914 | 46 | je 3f |
| d705269e UD |
47 | fld %st(1) |
| 48 | frndint | |
| 49 | fcomp %st(2) | |
| 50 | fnstsw | |
| 51 | sahf | |
| e208f556 | 52 | jne 4f |
| d38cd08c | 53 | fscale |
| 3e5f5557 | 54 | fstp %st(1) |
| 94ced920 | 55 | FLT_NARROW_EVAL |
| d38cd08c | 56 | ret |
| d705269e UD |
57 | |
| 58 | /* y is -inf */ | |
| 59 | 1: fxam | |
| 60 | #ifdef PIC | |
| fee732e5 | 61 | LOAD_PIC_REG (cx) |
| d705269e UD |
62 | #endif |
| 63 | fnstsw | |
| 64 | movl 4(%esp), %edx | |
| 65 | shrl $5, %eax | |
| 2827300f UD |
66 | fstp %st |
| 67 | fstp %st | |
| d705269e | 68 | andl $0x80000000, %edx |
| 9438b237 JM |
69 | andl $0x0228, %eax |
| 70 | cmpl $0x0028, %eax | |
| 71 | je 4f | |
| d705269e | 72 | andl $8, %eax |
| d705269e UD |
73 | shrl $27, %edx |
| 74 | addl %edx, %eax | |
| 75 | fldl MOX(zero_nan, %eax, 1) | |
| 76 | ret | |
| 77 | ||
| 78 | /* The result is NaN, but we must not raise an exception. | |
| 79 | So use a variable. */ | |
| 80 | 2: fstp %st | |
| 81 | fstp %st | |
| 82 | #ifdef PIC | |
| fee732e5 | 83 | LOAD_PIC_REG (cx) |
| d705269e UD |
84 | #endif |
| 85 | fldl MO(nan) | |
| 86 | ret | |
| 6d0c4914 UD |
87 | |
| 88 | /* The first parameter is a NaN. Return it. */ | |
| 89 | 3: fstp %st(1) | |
| 90 | ret | |
| e208f556 UD |
91 | |
| 92 | /* Return NaN and raise the invalid exception. */ | |
| 93 | 4: fstp %st | |
| 94 | fstp %st | |
| 95 | fldz | |
| 96 | fdiv %st | |
| 97 | ret | |
| d38cd08c | 98 | END(__ieee754_scalbf) |
| 220622dd | 99 | libm_alias_finite (__ieee754_scalbf, __scalbf) |