| /* |
| * 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 "JITMulGenerator.h" |
| |
| #if ENABLE(JIT) |
| |
| namespace JSC { |
| |
| void JITMulGenerator::generateFastPath(CCallHelpers& jit) |
| { |
| ASSERT(m_scratchGPR != InvalidGPRReg); |
| ASSERT(m_scratchGPR != m_left.payloadGPR()); |
| ASSERT(m_scratchGPR != m_right.payloadGPR()); |
| #if USE(JSVALUE64) |
| ASSERT(m_scratchGPR != m_result.payloadGPR()); |
| #else |
| ASSERT(m_scratchGPR != m_left.tagGPR()); |
| ASSERT(m_scratchGPR != m_right.tagGPR()); |
| ASSERT(m_scratchFPR != InvalidFPRReg); |
| #endif |
| |
| ASSERT(!m_leftOperand.isPositiveConstInt32() || !m_rightOperand.isPositiveConstInt32()); |
| |
| if (!m_leftOperand.mightBeNumber() || !m_rightOperand.mightBeNumber()) { |
| ASSERT(!m_didEmitFastPath); |
| return; |
| } |
| |
| m_didEmitFastPath = true; |
| |
| if (m_leftOperand.isPositiveConstInt32() || m_rightOperand.isPositiveConstInt32()) { |
| JSValueRegs var = m_leftOperand.isPositiveConstInt32() ? m_right : m_left; |
| SnippetOperand& varOpr = m_leftOperand.isPositiveConstInt32() ? m_rightOperand : m_leftOperand; |
| SnippetOperand& constOpr = m_leftOperand.isPositiveConstInt32() ? m_leftOperand : m_rightOperand; |
| |
| // Try to do intVar * intConstant. |
| CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var); |
| |
| GPRReg multiplyResultGPR = m_result.payloadGPR(); |
| if (multiplyResultGPR == var.payloadGPR()) |
| multiplyResultGPR = m_scratchGPR; |
| |
| m_slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), multiplyResultGPR)); |
| |
| jit.boxInt32(multiplyResultGPR, m_result); |
| m_endJumpList.append(jit.jump()); |
| |
| if (!jit.supportsFloatingPoint()) { |
| m_slowPathJumpList.append(notInt32); |
| return; |
| } |
| |
| // Try to do doubleVar * double(intConstant). |
| notInt32.link(&jit); |
| if (!varOpr.definitelyIsNumber()) |
| m_slowPathJumpList.append(jit.branchIfNotNumber(var, m_scratchGPR)); |
| |
| jit.unboxDoubleNonDestructive(var, m_leftFPR, m_scratchGPR, m_scratchFPR); |
| |
| jit.move(CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR); |
| jit.convertInt32ToDouble(m_scratchGPR, m_rightFPR); |
| |
| // Fall thru to doubleVar * doubleVar. |
| |
| } else { |
| ASSERT(!m_leftOperand.isPositiveConstInt32() && !m_rightOperand.isPositiveConstInt32()); |
| |
| CCallHelpers::Jump leftNotInt; |
| CCallHelpers::Jump rightNotInt; |
| |
| // Try to do intVar * intVar. |
| leftNotInt = jit.branchIfNotInt32(m_left); |
| rightNotInt = jit.branchIfNotInt32(m_right); |
| |
| m_slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), m_scratchGPR)); |
| m_slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_scratchGPR)); // Go slow if potential negative zero. |
| |
| jit.boxInt32(m_scratchGPR, m_result); |
| m_endJumpList.append(jit.jump()); |
| |
| if (!jit.supportsFloatingPoint()) { |
| m_slowPathJumpList.append(leftNotInt); |
| m_slowPathJumpList.append(rightNotInt); |
| return; |
| } |
| |
| leftNotInt.link(&jit); |
| if (!m_leftOperand.definitelyIsNumber()) |
| m_slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR)); |
| if (!m_rightOperand.definitelyIsNumber()) |
| m_slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR)); |
| |
| jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR); |
| CCallHelpers::Jump rightIsDouble = jit.branchIfNotInt32(m_right); |
| |
| jit.convertInt32ToDouble(m_right.payloadGPR(), m_rightFPR); |
| CCallHelpers::Jump rightWasInteger = jit.jump(); |
| |
| rightNotInt.link(&jit); |
| if (!m_rightOperand.definitelyIsNumber()) |
| m_slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR)); |
| |
| jit.convertInt32ToDouble(m_left.payloadGPR(), m_leftFPR); |
| |
| rightIsDouble.link(&jit); |
| jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR, m_scratchFPR); |
| |
| rightWasInteger.link(&jit); |
| |
| // Fall thru to doubleVar * doubleVar. |
| } |
| |
| // Do doubleVar * doubleVar. |
| jit.mulDouble(m_rightFPR, m_leftFPR); |
| |
| if (!m_resultProfile) |
| jit.boxDouble(m_leftFPR, m_result); |
| else { |
| // The Int52 overflow check below intentionally omits 1ll << 51 as a valid negative Int52 value. |
| // Therefore, we will get a false positive if the result is that value. This is intentionally |
| // done to simplify the checking algorithm. |
| |
| const int64_t negativeZeroBits = 1ll << 63; |
| #if USE(JSVALUE64) |
| jit.moveDoubleTo64(m_leftFPR, m_result.payloadGPR()); |
| CCallHelpers::Jump notNegativeZero = jit.branch64(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm64(negativeZeroBits)); |
| |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::NegZeroDouble), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| CCallHelpers::Jump done = jit.jump(); |
| |
| notNegativeZero.link(&jit); |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::NonNegZeroDouble), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| |
| jit.move(m_result.payloadGPR(), m_scratchGPR); |
| jit.urshiftPtr(CCallHelpers::Imm32(52), m_scratchGPR); |
| jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR); |
| CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431)); |
| |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::Int52Overflow), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| noInt52Overflow.link(&jit); |
| |
| done.link(&jit); |
| jit.sub64(GPRInfo::tagTypeNumberRegister, m_result.payloadGPR()); // Box the double. |
| #else |
| jit.boxDouble(m_leftFPR, m_result); |
| CCallHelpers::JumpList notNegativeZero; |
| notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm32(0))); |
| notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.tagGPR(), CCallHelpers::TrustedImm32(negativeZeroBits >> 32))); |
| |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::NegZeroDouble), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| CCallHelpers::Jump done = jit.jump(); |
| |
| notNegativeZero.link(&jit); |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::NonNegZeroDouble), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| |
| jit.move(m_result.tagGPR(), m_scratchGPR); |
| jit.urshiftPtr(CCallHelpers::Imm32(52 - 32), m_scratchGPR); |
| jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR); |
| CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431)); |
| |
| jit.or32(CCallHelpers::TrustedImm32(ResultProfile::Int52Overflow), CCallHelpers::AbsoluteAddress(m_resultProfile->addressOfFlags())); |
| |
| m_endJumpList.append(noInt52Overflow); |
| if (m_scratchGPR == m_result.tagGPR() || m_scratchGPR == m_result.payloadGPR()) |
| jit.boxDouble(m_leftFPR, m_result); |
| |
| m_endJumpList.append(done); |
| #endif |
| } |
| } |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(JIT) |
