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023ddc4128
On 32 bit x86, clang seems to miss loading input parameters based on asm constraints for inline assembly that uses the x87 floating registers, unless the snippet has got the volatile keyword. Signed-off-by: Martin Storsjö <martin@martin.st>
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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