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authorLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
committerLorry Tar Creator <lorry-tar-importer@lorry>2016-04-10 09:28:39 +0000
commit32761a6cee1d0dee366b885b7b9c777e67885688 (patch)
treed6bec92bebfb216f4126356e55518842c2f476a1 /Source/JavaScriptCore/jit/JITNegGenerator.cpp
parenta4e969f4965059196ca948db781e52f7cfebf19e (diff)
downloadWebKitGtk-tarball-32761a6cee1d0dee366b885b7b9c777e67885688.tar.gz
webkitgtk-2.4.11webkitgtk-2.4.11
Diffstat (limited to 'Source/JavaScriptCore/jit/JITNegGenerator.cpp')
-rw-r--r--Source/JavaScriptCore/jit/JITNegGenerator.cpp72
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diff --git a/Source/JavaScriptCore/jit/JITNegGenerator.cpp b/Source/JavaScriptCore/jit/JITNegGenerator.cpp
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--- a/Source/JavaScriptCore/jit/JITNegGenerator.cpp
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-/*
- * Copyright (C) 2015 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "JITNegGenerator.h"
-
-#if ENABLE(JIT)
-
-namespace JSC {
-
-void JITNegGenerator::generateFastPath(CCallHelpers& jit)
-{
- ASSERT(m_scratchGPR != m_src.payloadGPR());
- ASSERT(m_scratchGPR != m_result.payloadGPR());
- ASSERT(m_scratchGPR != InvalidGPRReg);
-#if USE(JSVALUE32_64)
- ASSERT(m_scratchGPR != m_src.tagGPR());
- ASSERT(m_scratchGPR != m_result.tagGPR());
-#endif
-
- m_didEmitFastPath = true;
-
- jit.moveValueRegs(m_src, m_result);
- CCallHelpers::Jump srcNotInt = jit.branchIfNotInt32(m_src);
-
- // -0 should produce a double, and hence cannot be negated as an int.
- // The negative int32 0x80000000 doesn't have a positive int32 representation, and hence cannot be negated as an int.
- m_slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_src.payloadGPR(), CCallHelpers::TrustedImm32(0x7fffffff)));
-
- jit.neg32(m_result.payloadGPR());
-#if USE(JSVALUE64)
- jit.boxInt32(m_result.payloadGPR(), m_result);
-#endif
- m_endJumpList.append(jit.jump());
-
- srcNotInt.link(&jit);
- m_slowPathJumpList.append(jit.branchIfNotNumber(m_src, m_scratchGPR));
-
- // For a double, all we need to do is to invert the sign bit.
-#if USE(JSVALUE64)
- jit.move(CCallHelpers::TrustedImm64((int64_t)(1ull << 63)), m_scratchGPR);
- jit.xor64(m_scratchGPR, m_result.payloadGPR());
-#else
- jit.xor32(CCallHelpers::TrustedImm32(1 << 31), m_result.tagGPR());
-#endif
-}
-
-} // namespace JSC
-
-#endif // ENABLE(JIT)