29 lines
727 B
C
29 lines
727 B
C
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/* $NetBSD: fpsetmask.c,v 1.5 2009/01/25 16:44:41 skrll Exp $ */
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/* $OpenBSD: fpsetmask.c,v 1.4 2004/01/05 06:06:16 otto Exp $ */
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/*
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* Written by Miodrag Vallat. Public domain
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: fpsetmask.c,v 1.5 2009/01/25 16:44:41 skrll Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <ieeefp.h>
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fp_except
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fpsetmask(fp_except mask)
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{
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uint64_t fpsr;
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fp_except old;
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__asm volatile("fstd %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr) : "memory");
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old = (fpsr >> 32) & 0x1f;
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fpsr = (fpsr & 0xffffffe000000000LL) | ((uint64_t)(mask & 0x1f) << 32);
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__asm volatile("fldd 0(%0),%%fr0" : : "r"(&fpsr) : "memory");
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return (old);
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}
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