| /** |
| * 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 "ilogb.S" |
| .text |
| .p2align 4,,15 |
| .globl __MINGW_USYMBOL(ilogb) |
| .def __MINGW_USYMBOL(ilogb); .scl 2; .type 32; .endef |
| #ifdef _WIN64 |
| .seh_proc __MINGW_USYMBOL(ilogb) |
| #endif |
| __MINGW_USYMBOL(ilogb): |
| #ifdef _WIN64 |
| /* Generated code by: |
| int |
| ilogb (double x) |
| { |
| __mingw_dbl_type_t hlp; |
| int hx, lx, ix; |
| |
| hlp.x = x; |
| hx = hpl.lh.high & 0x7fffffff; |
| if (hx < 0x100000) |
| { |
| lx = hlp.lh.low; |
| if ((hx | lx) == 0) |
| return 0x80000000; // ilogb(0) = FP_ILOGB0 |
| // subnormal x |
| if (hx == 0) |
| { |
| for (ix = -1043; lx > 0; lx <<= 1) |
| ix -=1; |
| } |
| else |
| { |
| for (ix = -1022,hx <<= 11; hx > 0; hx <<= 1) |
| ix -=1; |
| } |
| return ix; |
| } |
| if (hx < 0x7ff00000) |
| return (hx >> 20) - 1023; |
| lx = hlp.lh.low; |
| if (((hx ^ 0x7ff00000) | lx) == 0) |
| return 0x7fffffff; |
| return 0x80000000; |
| } */ |
| subq $24, %rsp |
| .seh_stackalloc 24 |
| .seh_endprologue |
| movsd %xmm0, 8(%rsp) |
| movq 8(%rsp), %rdx |
| shrq $32, %rdx |
| andl $2147483647, %edx |
| cmpl $1048575, %edx |
| jg .L2 |
| movq 8(%rsp), %rcx |
| movl %edx, %eax |
| orl %ecx, %eax |
| je .L8 |
| testl %edx, %edx |
| jne .L4 |
| testl %ecx, %ecx |
| movl %ecx, %edx |
| movl $-1043, %eax |
| jle .L3 |
| .p2align 4,,10 |
| .L5: |
| addl %edx, %edx |
| subl $1, %eax |
| testl %edx, %edx |
| jg .L5 |
| addq $24, %rsp |
| ret |
| .p2align 4,,10 |
| .L2: |
| cmpl $2146435071, %edx |
| jle .L13 |
| movsd %xmm0, 8(%rsp) |
| movq 8(%rsp), %rax |
| xorl $2146435072, %edx |
| orl %eax, %edx |
| cmpl $1, %edx |
| sbbl %eax, %eax |
| addl $-2147483648, %eax |
| .L3: |
| addq $24, %rsp |
| ret |
| .p2align 4,,10 |
| .L4: |
| sall $11, %edx |
| movl $-1022, %eax |
| testl %edx, %edx |
| jle .L3 |
| .p2align 4,,10 |
| .L6: |
| addl %edx, %edx |
| subl $1, %eax |
| testl %edx, %edx |
| jg .L6 |
| addq $24, %rsp |
| ret |
| .p2align 4,,10 |
| .L13: |
| sarl $20, %edx |
| leal -1023(%rdx), %eax |
| addq $24, %rsp |
| ret |
| .L8: |
| movl $-2147483648, %eax |
| jmp .L3 |
| .seh_endproc |
| #else |
| |
| fldl 4(%esp) |
| /* I added the following ugly construct because ilogb(+-Inf) is |
| required to return INT_MAX in ISO C99. |
| -- jakub@redhat.com. */ |
| fxam /* Is NaN or +-Inf? */ |
| fstsw %ax |
| movb $0x45, %dh |
| andb %ah, %dh |
| cmpb $0x05, %dh |
| je 1f /* Is +-Inf, jump. */ |
| |
| fxtract |
| pushl %eax |
| fstp %st |
| |
| fistpl (%esp) |
| fwait |
| popl %eax |
| |
| ret |
| |
| 1: fstp %st |
| movl $0x7fffffff, %eax |
| ret |
| #endif |
