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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/openj9
 Path: blob/master/runtime/j9vm31/j9vm31floatstubs.s
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*

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* Copyright (c) 2021, 2021 IBM Corp. and others

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*

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* This program and the accompanying materials are made

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* available under the terms of the Eclipse Public License 2.0

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* which accompanies this distribution and is available at

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* https://www.eclipse.org/legal/epl-2.0/ or the Apache License,

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* Version 2.0 which accompanies this distribution and is available

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* at https://www.apache.org/licenses/LICENSE-2.0.

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*

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* This Source Code is also Distributed under one or more

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* Secondary Licenses, as those terms are defined by the

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* Eclipse Public License, v. 2.0: GNU General Public License,

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* version 2 with the GNU Classpath Exception [1] and GNU

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* General Public License, version 2 with the OpenJDK Assembly

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* Exception [2].

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*

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* [1] https://www.gnu.org/software/classpath/license.html

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* [2] http://openjdk.java.net/legal/assembly-exception.html

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*

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         TITLE 'j9vm31floatstubs'

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**********************************************************************

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* This file contains a set of stub functions with the sole

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* intention of loading and storing float/double from/to FPR0.

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* However, since the OS Linkage dictates FPR0 is the incoming

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* param and outgoing return floating point register, these

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* functions are actually NOPs.  Ideally, we just generate

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* inline assembly code from the C code (j9cel4ro64 in this case)

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* once build compiler is upgraded.

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J9VM_STE CSECT

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J9VM_STE AMODE ANY

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J9VM_STE RMODE ANY

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         EDCPRLG

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* This routine is to extract FPR0 as a float

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* however, since OS linkage returns FPR0 anyways

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* this is a nop routine to trick compiler in

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* extracting return value from FPR0.

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         EDCEPIL

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         END

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J9VM_STD CSECT

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J9VM_STD AMODE ANY

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J9VM_STD RMODE ANY

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         EDCPRLG

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* This routine is to extract FPR0 as a double

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* however, since OS linkage returns FPR0 anyways

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* this is a nop routine to trick compiler in

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* extracting return value from FPR0.

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         EDCEPIL

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         END

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J9VM_LE CSECT

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J9VM_LE AMODE ANY

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J9VM_LE RMODE ANY

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         EDCPRLG

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* This routine is to store FPR0 with a float

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* parameter.  However, since OS linkage uses

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* FPR0 as the parm, this is a nop routine

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* to trick the compiler in doing it for us.

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         EDCEPIL

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         END

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J9VM_LD CSECT

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J9VM_LD AMODE ANY

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J9VM_LD RMODE ANY

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         EDCPRLG

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* This routine is to store FPR0 with a double

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* parameter.  However, since OS linkage uses

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* FPR0 as the parm, this is a nop routine

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* to trick the compiler in doing it for us.

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         EDCEPIL

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         END

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