49 lines
823 B
ArmAsm
49 lines
823 B
ArmAsm
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/* $NetBSD: fpsetround.S,v 1.3 2002/06/12 19:17:22 fvdl Exp $ */
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/*
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* Written by Frank van der Linden at Wasabi Systems for NetBSD.
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* Public domain.
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*/
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#include <machine/asm.h>
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/*
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* XXX set both the x87 control word and the SSE mxcsr register.
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* Applications should only set exception and round flags
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* via the fp*() interface, otherwise the status words
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* will get our of sync.
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*/
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(fpsetround, _fpsetround)
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ENTRY(_fpsetround)
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#else
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ENTRY(fpsetround)
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#endif
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fnstcw -4(%rsp)
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stmxcsr -8(%rsp)
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andl $3,%edi
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movl -4(%rsp),%edx
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rorl $10,%edx
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movl %edx,%eax
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andl $3,%eax
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andl $~3,%edx
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orl %edi,%edx
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roll $10,%edx
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movl %edx,-4(%rsp)
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movl -8(%rsp),%edx
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rorl $13,%edx
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andl $~3,%edx
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orl %edi,%edx
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roll $13,%edx
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movl %edx,-8(%rsp)
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ldmxcsr -8(%rsp)
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fldcw -4(%rsp)
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ret
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