110 lines
2.3 KiB
ArmAsm
110 lines
2.3 KiB
ArmAsm
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/**
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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 "ilogbf.S"
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.text
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.p2align 4,,15
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.globl __MINGW_USYMBOL(ilogbf)
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.def __MINGW_USYMBOL(ilogbf); .scl 2; .type 32; .endef
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#ifdef __x86_64__
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.seh_proc __MINGW_USYMBOL(ilogbf)
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#endif
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__MINGW_USYMBOL(ilogbf):
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#ifdef __x86_64__
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/* generated code for:
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int
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ilogbf (float x)
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{
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__mingw_flt_type_t hlp;
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int hx, ix;
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hlp.x = x;
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hx = (int) hlp.val & 0x7fffffff;
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if (hx < 0x800000)
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{
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if (hx == 0)
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return 0x80000000; // ilogb(0) = FP_ILOGB0
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for (ix = -126, hx <<= 8; hx > 0; hx <<= 1)
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ix -= 1;
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return ix;
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}
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if (hx < 0x7f800000)
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return (hx >> 23) - 127;
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if (hx == 0x7f800000)
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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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movss %xmm0, 12(%rsp)
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movl 12(%rsp), %edx
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andl $2147483647, %edx
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cmpl $8388607, %edx
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jg .L2
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testl %edx, %edx
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je .L6
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sall $8, %edx
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movl $-126, %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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.L4:
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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 .L4
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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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.L2:
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cmpl $2139095039, %edx
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jle .L10
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cmpl $2139095040, %edx
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movl $2147483647, %eax
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movl $-2147483648, %edx
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cmovne %edx, %eax
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addq $24, %rsp
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ret
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.p2align 4,,10
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.L10:
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sarl $23, %edx
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leal -127(%rdx), %eax
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addq $24, %rsp
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ret
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.L6:
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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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flds 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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