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8353735: [JVMCI] Allow specifying storage kind of the callee save register #24451

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8353735: [JVMCI] Allow specifying storage kind of the callee save register #24451

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[JVMCI] Allow specifying storage kind of the callee save register
mur47x111 Apr 4, 2025
d6a4467
Merge remote-tracking branch 'upstream/master' into JDK-8353735
mur47x111 May 8, 2025
fcdfd10
Update javadoc
mur47x111 May 8, 2025
bc90051
Update javadoc
mur47x111 May 8, 2025
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12 changes: 11 additions & 1 deletion src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/code/RegisterConfig.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2009, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -94,6 +94,16 @@ default int getMaximumFrameSize() {
*/
RegisterArray getCalleeSaveRegisters();

/**
* Returns the storage kind for a callee-save register, which determines how the register is
* saved and restored. For example, according to the Windows x64 ABI, the upper portions of
* XMM0-XMM15 are considered destroyed, so saving the full width of these registers is not
* necessary.
*/
default PlatformKind getCalleeSaveRegisterStorageKind(Architecture arch, Register calleeSaveRegister) {
return arch.getLargestStorableKind(calleeSaveRegister.getRegisterCategory());
}

/**
* Gets a map from register {@linkplain Register#number numbers} to register
* {@linkplain RegisterAttributes attributes} for this register configuration.
Expand Down