1 /*
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
14  *
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22  */
23 
24 
25 
26 package org.graalvm.compiler.lir.aarch64;
27 
28 import static jdk.vm.ci.code.ValueUtil.asRegister;
29 
30 import org.graalvm.compiler.asm.aarch64.AArch64MacroAssembler;
31 import org.graalvm.compiler.lir.LIRInstructionClass;
32 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
33 
34 import jdk.vm.ci.aarch64.AArch64Kind;
35 import jdk.vm.ci.code.Register;
36 import jdk.vm.ci.meta.AllocatableValue;
37 
38 /**
39  * Instruction that reinterprets some bit pattern as a different type. It is possible to reinterpret
40  * the following: - int <-> float - long <-> double
41  */
42 public class AArch64ReinterpretOp extends AArch64LIRInstruction {
43     private static final LIRInstructionClass<AArch64ReinterpretOp> TYPE = LIRInstructionClass.create(AArch64ReinterpretOp.class);
44 
45     @Def protected AllocatableValue resultValue;
46     @Use protected AllocatableValue inputValue;
47 
AArch64ReinterpretOp(AllocatableValue resultValue, AllocatableValue inputValue)48     public AArch64ReinterpretOp(AllocatableValue resultValue, AllocatableValue inputValue) {
49         super(TYPE);
50         AArch64Kind from = (AArch64Kind) inputValue.getPlatformKind();
51         AArch64Kind to = (AArch64Kind) resultValue.getPlatformKind();
52         assert from.getSizeInBytes() == to.getSizeInBytes() && from.isInteger() ^ to.isInteger();
53         this.resultValue = resultValue;
54         this.inputValue = inputValue;
55     }
56 
57     @Override
emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm)58     public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
59         Register result = asRegister(resultValue);
60         Register input = asRegister(inputValue);
61         AArch64Kind to = (AArch64Kind) resultValue.getPlatformKind();
62         final int size = to.getSizeInBytes() * Byte.SIZE;
63         masm.fmov(size, result, input);
64     }
65 }
66