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43 lines
798 B
ArmAsm
43 lines
798 B
ArmAsm
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/* $NetBSD: fpsetround.S,v 1.4 2011/09/30 17:42:34 christos 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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movl -4(%rsp), %edx
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movl %edx, %eax
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andl $0x00000c00, %eax
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andl $0xfffff3ff, %edx
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orl %edi, %edx
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movl %edx, -4(%rsp)
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fldcw -4(%rsp)
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stmxcsr -4(%rsp)
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movl -4(%rsp), %edx
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andl $0xffff9fff, %edx
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sall $3, %edi
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orl %edi,%edx
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movl %edx,-4(%rsp)
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ldmxcsr -4(%rsp)
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ret
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