src/cmd/8c/machcap.c

// Inferno utils/8c/machcap.c
// http://code.google.com/p/inferno-os/source/browse/utils/8c/machcap.c
//
//	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
//	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
//	Portions Copyright © 1997-1999 Vita Nuova Limited
//	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
//	Portions Copyright © 2004,2006 Bruce Ellis
//	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
//	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
//	Portions Copyright © 2009 The Go Authors.  All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "gc.h"

int
machcap(Node *n)
{

	if(n == Z)
		return 1;	/* test */

	switch(n->op) {
	case OMUL:
	case OLMUL:
	case OASMUL:
	case OASLMUL:
		if(typechl[n->type->etype])
			return 1;
		if(typev[n->type->etype]) {
				return 1;
		}
		break;

	case OCOM:
	case ONEG:
	case OADD:
	case OAND:
	case OOR:
	case OSUB:
	case OXOR:
	case OASHL:
	case OLSHR:
	case OASHR:
		if(typechlv[n->left->type->etype])
			return 1;
		break;

	case OCAST:
		if(typev[n->type->etype]) {
			if(typechlp[n->left->type->etype])
				return 1;
		}
		else if(!typefd[n->type->etype]) {
			if(typev[n->left->type->etype])
				return 1;
		}
		break;

	case OCOND:
	case OCOMMA:
	case OLIST:
	case OANDAND:
	case OOROR:
	case ONOT:
		return 1;

	case OASADD:
	case OASSUB:
	case OASAND:
	case OASOR:
	case OASXOR:
		return 1;

	case OASASHL:
	case OASASHR:
	case OASLSHR:
		return 1;

	case OPOSTINC:
	case OPOSTDEC:
	case OPREINC:
	case OPREDEC:
		return 1;

	case OEQ:
	case ONE:
	case OLE:
	case OGT:
	case OLT:
	case OGE:
	case OHI:
	case OHS:
	case OLO:
	case OLS:
		return 1;
	}
	return 0;
}