mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
257 lines
11 KiB
C++
257 lines
11 KiB
C++
/*
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* Copyright (C) 2015-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "JITMulGenerator.h"
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#if ENABLE(JIT)
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#include "ArithProfile.h"
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#include "JITMathIC.h"
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namespace JSC {
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JITMathICInlineResult JITMulGenerator::generateInline(CCallHelpers& jit, MathICGenerationState& state, const BinaryArithProfile* arithProfile)
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{
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// We default to speculating int32.
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ObservedType lhs = ObservedType().withInt32();
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ObservedType rhs = ObservedType().withInt32();
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if (arithProfile) {
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lhs = arithProfile->lhsObservedType();
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rhs = arithProfile->rhsObservedType();
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}
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if (lhs.isOnlyNonNumber() && rhs.isOnlyNonNumber())
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return JITMathICInlineResult::DontGenerate;
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if (lhs.isOnlyNumber() && rhs.isOnlyNumber() && !m_leftOperand.isConst() && !m_rightOperand.isConst()) {
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if (!jit.supportsFloatingPoint())
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return JITMathICInlineResult::DontGenerate;
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ASSERT(m_left);
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ASSERT(m_right);
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if (!m_leftOperand.definitelyIsNumber())
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state.slowPathJumps.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
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if (!m_rightOperand.definitelyIsNumber())
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state.slowPathJumps.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
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state.slowPathJumps.append(jit.branchIfInt32(m_left));
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state.slowPathJumps.append(jit.branchIfInt32(m_right));
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jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
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jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR, m_scratchFPR);
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jit.mulDouble(m_rightFPR, m_leftFPR);
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jit.boxDouble(m_leftFPR, m_result);
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return JITMathICInlineResult::GeneratedFastPath;
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}
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if ((lhs.isOnlyInt32() || m_leftOperand.isPositiveConstInt32()) && (rhs.isOnlyInt32() || m_rightOperand.isPositiveConstInt32())) {
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ASSERT(!m_leftOperand.isPositiveConstInt32() || !m_rightOperand.isPositiveConstInt32());
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if (!m_leftOperand.isPositiveConstInt32())
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state.slowPathJumps.append(jit.branchIfNotInt32(m_left));
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if (!m_rightOperand.isPositiveConstInt32())
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state.slowPathJumps.append(jit.branchIfNotInt32(m_right));
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if (m_leftOperand.isPositiveConstInt32() || m_rightOperand.isPositiveConstInt32()) {
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JSValueRegs var = m_leftOperand.isPositiveConstInt32() ? m_right : m_left;
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int32_t constValue = m_leftOperand.isPositiveConstInt32() ? m_leftOperand.asConstInt32() : m_rightOperand.asConstInt32();
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state.slowPathJumps.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constValue), m_scratchGPR));
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} else {
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state.slowPathJumps.append(jit.branchMul32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), m_scratchGPR));
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state.slowPathJumps.append(jit.branchTest32(CCallHelpers::Zero, m_scratchGPR)); // Go slow if potential negative zero.
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}
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jit.boxInt32(m_scratchGPR, m_result);
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return JITMathICInlineResult::GeneratedFastPath;
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}
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return JITMathICInlineResult::GenerateFullSnippet;
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}
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bool JITMulGenerator::generateFastPath(CCallHelpers& jit, CCallHelpers::JumpList& endJumpList, CCallHelpers::JumpList& slowPathJumpList, const BinaryArithProfile* arithProfile, bool shouldEmitProfiling)
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{
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ASSERT(m_scratchGPR != InvalidGPRReg);
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ASSERT(m_scratchGPR != m_left.payloadGPR());
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ASSERT(m_scratchGPR != m_right.payloadGPR());
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#if USE(JSVALUE64)
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ASSERT(m_scratchGPR != m_result.payloadGPR());
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#else
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ASSERT(m_scratchGPR != m_left.tagGPR());
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ASSERT(m_scratchGPR != m_right.tagGPR());
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ASSERT(m_scratchFPR != InvalidFPRReg);
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#endif
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ASSERT(!m_leftOperand.isPositiveConstInt32() || !m_rightOperand.isPositiveConstInt32());
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if (!m_leftOperand.mightBeNumber() || !m_rightOperand.mightBeNumber())
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return false;
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if (m_leftOperand.isPositiveConstInt32() || m_rightOperand.isPositiveConstInt32()) {
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JSValueRegs var = m_leftOperand.isPositiveConstInt32() ? m_right : m_left;
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SnippetOperand& varOpr = m_leftOperand.isPositiveConstInt32() ? m_rightOperand : m_leftOperand;
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SnippetOperand& constOpr = m_leftOperand.isPositiveConstInt32() ? m_leftOperand : m_rightOperand;
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// Try to do intVar * intConstant.
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CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var);
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GPRReg multiplyResultGPR = m_result.payloadGPR();
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if (multiplyResultGPR == var.payloadGPR())
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multiplyResultGPR = m_scratchGPR;
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slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), multiplyResultGPR));
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jit.boxInt32(multiplyResultGPR, m_result);
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endJumpList.append(jit.jump());
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if (!jit.supportsFloatingPoint()) {
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slowPathJumpList.append(notInt32);
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return true;
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}
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// Try to do doubleVar * double(intConstant).
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notInt32.link(&jit);
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if (!varOpr.definitelyIsNumber())
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slowPathJumpList.append(jit.branchIfNotNumber(var, m_scratchGPR));
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jit.unboxDoubleNonDestructive(var, m_leftFPR, m_scratchGPR, m_scratchFPR);
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jit.move(CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR);
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jit.convertInt32ToDouble(m_scratchGPR, m_rightFPR);
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// Fall thru to doubleVar * doubleVar.
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} else {
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ASSERT(!m_leftOperand.isPositiveConstInt32() && !m_rightOperand.isPositiveConstInt32());
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CCallHelpers::Jump leftNotInt;
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CCallHelpers::Jump rightNotInt;
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// Try to do intVar * intVar.
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leftNotInt = jit.branchIfNotInt32(m_left);
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rightNotInt = jit.branchIfNotInt32(m_right);
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slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), m_scratchGPR));
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slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_scratchGPR)); // Go slow if potential negative zero.
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jit.boxInt32(m_scratchGPR, m_result);
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endJumpList.append(jit.jump());
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if (!jit.supportsFloatingPoint()) {
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slowPathJumpList.append(leftNotInt);
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slowPathJumpList.append(rightNotInt);
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return true;
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}
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leftNotInt.link(&jit);
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if (!m_leftOperand.definitelyIsNumber())
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slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
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if (!m_rightOperand.definitelyIsNumber())
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slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
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jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
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CCallHelpers::Jump rightIsDouble = jit.branchIfNotInt32(m_right);
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jit.convertInt32ToDouble(m_right.payloadGPR(), m_rightFPR);
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CCallHelpers::Jump rightWasInteger = jit.jump();
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rightNotInt.link(&jit);
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if (!m_rightOperand.definitelyIsNumber())
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slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
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jit.convertInt32ToDouble(m_left.payloadGPR(), m_leftFPR);
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rightIsDouble.link(&jit);
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jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR, m_scratchFPR);
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rightWasInteger.link(&jit);
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// Fall thru to doubleVar * doubleVar.
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}
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// Do doubleVar * doubleVar.
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jit.mulDouble(m_rightFPR, m_leftFPR);
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if (!arithProfile || !shouldEmitProfiling)
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jit.boxDouble(m_leftFPR, m_result);
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else {
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// The Int52 overflow check below intentionally omits 1ll << 51 as a valid negative Int52 value.
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// Therefore, we will get a false positive if the result is that value. This is intentionally
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// done to simplify the checking algorithm.
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const int64_t negativeZeroBits = 1ll << 63;
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#if USE(JSVALUE64)
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jit.moveDoubleTo64(m_leftFPR, m_result.payloadGPR());
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CCallHelpers::Jump notNegativeZero = jit.branch64(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm64(negativeZeroBits));
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arithProfile->emitUnconditionalSet(jit, ObservedResults::NegZeroDouble);
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CCallHelpers::Jump done = jit.jump();
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notNegativeZero.link(&jit);
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arithProfile->emitUnconditionalSet(jit, ObservedResults::NonNegZeroDouble);
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jit.move(m_result.payloadGPR(), m_scratchGPR);
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jit.urshiftPtr(CCallHelpers::Imm32(52), m_scratchGPR);
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jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR);
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CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431));
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arithProfile->emitUnconditionalSet(jit, ObservedResults::Int52Overflow);
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noInt52Overflow.link(&jit);
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done.link(&jit);
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jit.sub64(GPRInfo::numberTagRegister, m_result.payloadGPR()); // Box the double.
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#else
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jit.boxDouble(m_leftFPR, m_result);
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CCallHelpers::JumpList notNegativeZero;
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notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm32(0)));
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notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.tagGPR(), CCallHelpers::TrustedImm32(negativeZeroBits >> 32)));
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arithProfile->emitUnconditionalSet(jit, ObservedResults::NegZeroDouble);
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CCallHelpers::Jump done = jit.jump();
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notNegativeZero.link(&jit);
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arithProfile->emitUnconditionalSet(jit, ObservedResults::NonNegZeroDouble);
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jit.move(m_result.tagGPR(), m_scratchGPR);
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jit.urshiftPtr(CCallHelpers::Imm32(52 - 32), m_scratchGPR);
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jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR);
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CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431));
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arithProfile->emitUnconditionalSet(jit, ObservedResults::Int52Overflow);
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endJumpList.append(noInt52Overflow);
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if (m_scratchGPR == m_result.tagGPR() || m_scratchGPR == m_result.payloadGPR())
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jit.boxDouble(m_leftFPR, m_result);
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endJumpList.append(done);
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#endif
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}
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return true;
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}
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} // namespace JSC
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#endif // ENABLE(JIT)
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