diff options
Diffstat (limited to 'chromium/v8/src/hydrogen-uint32-analysis.cc')
-rw-r--r-- | chromium/v8/src/hydrogen-uint32-analysis.cc | 64 |
1 files changed, 34 insertions, 30 deletions
diff --git a/chromium/v8/src/hydrogen-uint32-analysis.cc b/chromium/v8/src/hydrogen-uint32-analysis.cc index 8de887d6f80..7616f3d46b6 100644 --- a/chromium/v8/src/hydrogen-uint32-analysis.cc +++ b/chromium/v8/src/hydrogen-uint32-analysis.cc @@ -1,36 +1,37 @@ // Copyright 2013 the V8 project authors. All rights reserved. -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * 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. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived -// from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "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 THE COPYRIGHT -// OWNER 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 "hydrogen-uint32-analysis.h" +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "src/hydrogen-uint32-analysis.h" namespace v8 { namespace internal { +static bool IsUnsignedLoad(HLoadKeyed* instr) { + switch (instr->elements_kind()) { + case EXTERNAL_UINT8_ELEMENTS: + case EXTERNAL_UINT16_ELEMENTS: + case EXTERNAL_UINT32_ELEMENTS: + case EXTERNAL_UINT8_CLAMPED_ELEMENTS: + case UINT8_ELEMENTS: + case UINT16_ELEMENTS: + case UINT32_ELEMENTS: + case UINT8_CLAMPED_ELEMENTS: + return true; + default: + return false; + } +} + + +static bool IsUint32Operation(HValue* instr) { + return instr->IsShr() || + (instr->IsLoadKeyed() && IsUnsignedLoad(HLoadKeyed::cast(instr))) || + (instr->IsInteger32Constant() && instr->GetInteger32Constant() >= 0); +} + + bool HUint32AnalysisPhase::IsSafeUint32Use(HValue* val, HValue* use) { // Operations that operate on bits are safe. if (use->IsBitwise() || use->IsShl() || use->IsSar() || use->IsShr()) { @@ -54,12 +55,15 @@ bool HUint32AnalysisPhase::IsSafeUint32Use(HValue* val, HValue* use) { // operation. if (store->value() == val) { // Clamping or a conversion to double should have beed inserted. - ASSERT(store->elements_kind() != EXTERNAL_PIXEL_ELEMENTS); - ASSERT(store->elements_kind() != EXTERNAL_FLOAT_ELEMENTS); - ASSERT(store->elements_kind() != EXTERNAL_DOUBLE_ELEMENTS); + ASSERT(store->elements_kind() != EXTERNAL_UINT8_CLAMPED_ELEMENTS); + ASSERT(store->elements_kind() != EXTERNAL_FLOAT32_ELEMENTS); + ASSERT(store->elements_kind() != EXTERNAL_FLOAT64_ELEMENTS); return true; } } + } else if (use->IsCompareNumericAndBranch()) { + HCompareNumericAndBranch* c = HCompareNumericAndBranch::cast(use); + return IsUint32Operation(c->left()) && IsUint32Operation(c->right()); } return false; |