49d1a4c562
also start prefering NtDll API. so far: * NtQueryInformationFile * NtClose adds a performance workaround for windows unicode conversion. but that should probably be removed before merging
144 lines
3.0 KiB
ArmAsm
144 lines
3.0 KiB
ArmAsm
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <_mingw_mac.h>
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.file "ilogb.S"
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.text
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.p2align 4,,15
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.globl __MINGW_USYMBOL(ilogb)
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.def __MINGW_USYMBOL(ilogb); .scl 2; .type 32; .endef
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#ifdef __x86_64__
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.seh_proc __MINGW_USYMBOL(ilogb)
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#endif
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__MINGW_USYMBOL(ilogb):
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#ifdef __x86_64__
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/* Generated code by:
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int
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ilogb (double x)
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{
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__mingw_dbl_type_t hlp;
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int hx, lx, ix;
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hlp.x = x;
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hx = hpl.lh.high & 0x7fffffff;
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if (hx < 0x100000)
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{
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lx = hlp.lh.low;
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if ((hx | lx) == 0)
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return 0x80000000; // ilogb(0) = FP_ILOGB0
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// subnormal x
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if (hx == 0)
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{
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for (ix = -1043; lx > 0; lx <<= 1)
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ix -=1;
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}
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else
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{
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for (ix = -1022,hx <<= 11; hx > 0; hx <<= 1)
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ix -=1;
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}
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return ix;
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}
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if (hx < 0x7ff00000)
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return (hx >> 20) - 1023;
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lx = hlp.lh.low;
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if (((hx ^ 0x7ff00000) | lx) == 0)
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return 0x7fffffff;
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return 0x80000000;
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} */
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subq $24, %rsp
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.seh_stackalloc 24
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.seh_endprologue
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movsd %xmm0, 8(%rsp)
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movq 8(%rsp), %rdx
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shrq $32, %rdx
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andl $2147483647, %edx
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cmpl $1048575, %edx
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jg .L2
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movq 8(%rsp), %rcx
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movl %edx, %eax
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orl %ecx, %eax
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je .L8
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testl %edx, %edx
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jne .L4
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testl %ecx, %ecx
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movl %ecx, %edx
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movl $-1043, %eax
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jle .L3
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.p2align 4,,10
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.L5:
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addl %edx, %edx
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subl $1, %eax
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testl %edx, %edx
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jg .L5
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addq $24, %rsp
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ret
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.p2align 4,,10
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.L2:
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cmpl $2146435071, %edx
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jle .L13
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movsd %xmm0, 8(%rsp)
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movq 8(%rsp), %rax
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xorl $2146435072, %edx
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orl %eax, %edx
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cmpl $1, %edx
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sbbl %eax, %eax
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addl $-2147483648, %eax
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.L3:
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addq $24, %rsp
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ret
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.p2align 4,,10
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.L4:
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sall $11, %edx
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movl $-1022, %eax
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testl %edx, %edx
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jle .L3
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.p2align 4,,10
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.L6:
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addl %edx, %edx
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subl $1, %eax
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testl %edx, %edx
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jg .L6
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addq $24, %rsp
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ret
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.p2align 4,,10
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.L13:
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sarl $20, %edx
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leal -1023(%rdx), %eax
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addq $24, %rsp
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ret
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.L8:
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movl $-2147483648, %eax
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jmp .L3
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.seh_endproc
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#else
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fldl 4(%esp)
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/* I added the following ugly construct because ilogb(+-Inf) is
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required to return INT_MAX in ISO C99.
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-- jakub@redhat.com. */
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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fxtract
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pushl %eax
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fstp %st
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fistpl (%esp)
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fwait
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popl %eax
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ret
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1: fstp %st
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movl $0x7fffffff, %eax
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ret
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#endif
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