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
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/**
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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 within this package.
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*/
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typedef union __mingw_ldbl_type_t
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{
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long double x;
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__extension__ struct {
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unsigned int low, high;
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int sign_exponent : 16;
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int res1 : 16;
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int res0 : 32;
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} lh;
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} __mingw_ldbl_type_t;
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typedef union __mingw_fp_types_t
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{
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long double *ld;
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__mingw_ldbl_type_t *ldt;
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} __mingw_fp_types_t;
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#define __FP_SIGNBIT 0x0200
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extern int __signbit (double x);
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int __signbitl (long double x);
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int __signbitl (long double x) {
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#if defined(__x86_64__) || defined(_AMD64_)
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__mingw_fp_types_t ld;
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ld.ld = &x;
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return ((ld.ldt->lh.sign_exponent & 0x8000) != 0);
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#elif defined(__arm__) || defined(_ARM_) || defined(__aarch64__) || defined(_ARM64_)
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return __signbit(x);
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#elif defined(__i386__) || defined(_X86_)
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unsigned short sw;
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__asm__ __volatile__ ("fxam; fstsw %%ax;"
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: "=a" (sw)
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: "t" (x) );
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return (sw & __FP_SIGNBIT) != 0;
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#endif
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}
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int __attribute__ ((alias ("__signbitl"))) signbitl (long double);
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