42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/**
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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 <fenv.h>
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#include <math.h>
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#include <errno.h>
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long double
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modfl (long double value, long double* iptr)
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{
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long double int_part = 0.0L;
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/* truncate */
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#if defined(_AMD64_) || defined(__x86_64__)
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asm volatile ("subq $8, %%rsp\n"
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"fnstcw 4(%%rsp)\n"
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"movzwl 4(%%rsp), %%eax\n"
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"orb $12, %%ah\n"
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"movw %%ax, (%%rsp)\n"
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"fldcw (%%rsp)\n"
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"frndint\n"
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"fldcw 4(%%rsp)\n"
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"addq $8, %%rsp\n" : "=t" (int_part) : "0" (value) : "eax"); /* round */
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#elif defined(_X86_) || defined(__i386__)
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asm volatile ("push %%eax\n\tsubl $8, %%esp\n"
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"fnstcw 4(%%esp)\n"
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"movzwl 4(%%esp), %%eax\n"
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"orb $12, %%ah\n"
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"movw %%ax, (%%esp)\n"
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"fldcw (%%esp)\n"
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"frndint\n"
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"fldcw 4(%%esp)\n"
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"addl $8, %%esp\n\tpop %%eax\n" : "=t" (int_part) : "0" (value) : "eax"); /* round */
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#else
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int_part = truncl(value);
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#endif
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if (iptr)
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*iptr = int_part;
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return (isinf (value) ? 0.0L : value - int_part);
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}
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