| changeset 59095 | 03fbcd06b4c0 |
| parent 51228 | 087c3ba2d138 |
| 59094:5d4c3724e4c7 | 59095:03fbcd06b4c0 |
|---|---|
1 /* |
1 /* |
2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
5 * This code is free software; you can redistribute it and/or modify it |
6 * under the terms of the GNU General Public License version 2 only, as |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
109 /* |
109 /* |
110 * We potentially return to the interpreter, and that's an AVX-SSE transition. The only |
110 * We potentially return to the interpreter, and that's an AVX-SSE transition. The only |
111 * live value at this point should be the return value in either rax, or in xmm0 with |
111 * live value at this point should be the return value in either rax, or in xmm0 with |
112 * the upper half of the register unused, so we don't destroy any value here. |
112 * the upper half of the register unused, so we don't destroy any value here. |
113 */ |
113 */ |
114 if (masm.supports(CPUFeature.AVX)) { |
114 if (masm.supports(CPUFeature.AVX) && crb.needsClearUpperVectorRegisters()) { |
115 // If we decide to perform vzeroupper also for stubs (like what JDK9+ C2 does for |
|
116 // intrinsics that employ AVX2 instruction), we need to be careful that it kills all |
|
117 // the xmm registers (at least the upper halves). |
|
115 masm.vzeroupper(); |
118 masm.vzeroupper(); |
116 } |
119 } |
117 } |
120 } |
118 masm.ret(0); |
121 masm.ret(0); |
119 } |
122 } |
123 |
|
120 } |
124 } |