webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 84 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/jit/JITLeftShiftGenerator.cpp b/Source/JavaScriptCore/jit/JITLeftShiftGenerator.cpp
new file mode 100644
index 000000000..1ddaa6ab1
--- /dev/null
+++ b/Source/JavaScriptCore/jit/JITLeftShiftGenerator.cpp
@@ -0,0 +1,84 @@
+/*
+ * 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 "JITLeftShiftGenerator.h"
+
+#if ENABLE(JIT)
+
+namespace JSC {
+
+void JITLeftShiftGenerator::generateFastPath(CCallHelpers& jit)
+{
+    ASSERT(m_scratchGPR != InvalidGPRReg);
+    ASSERT(m_scratchGPR != m_left.payloadGPR());
+    ASSERT(m_scratchGPR != m_right.payloadGPR());
+#if USE(JSVALUE32_64)
+    ASSERT(m_scratchGPR != m_left.tagGPR());
+    ASSERT(m_scratchGPR != m_right.tagGPR());
+#endif
+
+    ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
+
+    m_didEmitFastPath = true;
+
+    if (m_rightOperand.isConstInt32()) {
+        // Try to do (intVar << intConstant).
+        m_slowPathJumpList.append(jit.branchIfNotInt32(m_left));
+
+        jit.moveValueRegs(m_left, m_result);
+        jit.lshift32(CCallHelpers::Imm32(m_rightOperand.asConstInt32()), m_result.payloadGPR());
+
+    } else {
+        // Try to do (intConstant << intVar) or (intVar << intVar).
+        m_slowPathJumpList.append(jit.branchIfNotInt32(m_right));
+
+        GPRReg rightOperandGPR = m_right.payloadGPR();
+        if (rightOperandGPR == m_result.payloadGPR()) {
+            jit.move(rightOperandGPR, m_scratchGPR);
+            rightOperandGPR = m_scratchGPR;
+        }
+
+        if (m_leftOperand.isConstInt32()) {
+#if USE(JSVALUE32_64)
+            jit.move(m_right.tagGPR(), m_result.tagGPR());
+#endif
+            jit.move(CCallHelpers::Imm32(m_leftOperand.asConstInt32()), m_result.payloadGPR());
+        } else {
+            m_slowPathJumpList.append(jit.branchIfNotInt32(m_left));
+            jit.moveValueRegs(m_left, m_result);
+        }
+
+        jit.lshift32(rightOperandGPR, m_result.payloadGPR());
+    }
+
+#if USE(JSVALUE64)
+    jit.or64(GPRInfo::tagTypeNumberRegister, m_result.payloadGPR());
+#endif
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)