Attachment 349256 Details for Bug 189451 – Patch

[patch] Patch

bug-189451-20180909035959.patch (text/plain), 3.59 KB, created by Yusuke Suzuki on 2018-09-08 12:00:00 PDT

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Creator: Yusuke Suzuki

Created: 2018-09-08 12:00:00 PDT

Size: 3.59 KB

patch

obsolete

>Subversion Revision: 235827
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index dfff4175f9ef5ca37a1147f611d1244cb5c85a80..09eb4bd9c0b452e6f1b00236d6884ccde0b53337 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,18 @@
>+2018-09-08  Yusuke Suzuki  <yusukesuzuki@slowstart.org>
>+
>+        [CSSJIT] Use lshiftPtr instead of mul32
>+        https://bugs.webkit.org/show_bug.cgi?id=189451
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Use `value << 4` instead of `value * 16`. In 64bit environment, sizeof(Style::Relation) is 16,
>+        so that we can use `value << 4` in CSS JIT.
>+
>+        No behavior change.
>+
>+        * cssjit/SelectorCompiler.cpp:
>+        (WebCore::SelectorCompiler::SelectorCodeGenerator::generateAddStyleRelation):
>+
> 2018-09-07  Fujii Hironori  <Hironori.Fujii@sony.com>
> 
>         [Win][Clang] exceptionShouldTerminateProgram of StructuredExceptionHandlerSuppressor.cpp should take DWORD
>diff --git a/Source/WebCore/cssjit/SelectorCompiler.cpp b/Source/WebCore/cssjit/SelectorCompiler.cpp
>index 46ada4fe1b697a2c288289fd20fff08ab25517a0..23b5131c46afef4e099a7e417a26efb47467e4c4 100644
>--- a/Source/WebCore/cssjit/SelectorCompiler.cpp
>+++ b/Source/WebCore/cssjit/SelectorCompiler.cpp
>@@ -2211,6 +2211,18 @@ void SelectorCodeGenerator::generateAddStyleRelation(Assembler::RegisterID check
>     auto dataAddress = vectorAddress.withOffset(Style::Relations::dataMemoryOffset());
>     auto sizeAddress = vectorAddress.withOffset(Style::Relations::sizeMemoryOffset());
> 
>+    auto getLastRelationPointer = [&] (RegisterID sizeAndTarget) {
>+        m_assembler.sub32(Assembler::TrustedImm32(1), sizeAndTarget);
>+#if CPU(ADDRESS64)
>+        static_assert(sizeof(Style::Relation) == 16, "");
>+        static_assert(1 << 4 == 16, "");
>+        m_assembler.lshiftPtr(Assembler::TrustedImm32(4), sizeAndTarget);
>+#else
>+        m_assembler.mul32(TrustedImm32(sizeof(Style::Relation)), sizeAndTarget, sizeAndTarget);
>+#endif
>+        m_assembler.addPtr(dataAddress, sizeAndTarget);
>+    };
>+
>     // For AffectsNextSibling we just increment the count if the previous added relation was in the same sibling chain.
>     Assembler::JumpList mergeSuccess;
>     if (relationType == Style::Relation::AffectsNextSibling) {
>@@ -2223,9 +2235,7 @@ void SelectorCodeGenerator::generateAddStyleRelation(Assembler::RegisterID check
>         mergeFailure.append(m_assembler.branchTest32(Assembler::Zero, lastRelation));
> 
>         // Style::Relation& lastRelation = checkingContext.styleRelations.last();
>-        m_assembler.sub32(Assembler::TrustedImm32(1), lastRelation);
>-        m_assembler.mul32(Assembler::TrustedImm32(sizeof(Style::Relation)), lastRelation, lastRelation);
>-        m_assembler.addPtr(dataAddress, lastRelation);
>+        getLastRelationPointer(lastRelation);
> 
>         // if (lastRelation.type == Style::Relation::AffectsNextSibling)
>         Assembler::Address typeAddress(lastRelation, OBJECT_OFFSETOF(Style::Relation, type));
>@@ -2259,9 +2269,7 @@ void SelectorCodeGenerator::generateAddStyleRelation(Assembler::RegisterID check
> 
>     LocalRegister relationPointer(m_registerAllocator);
>     m_assembler.load32(sizeAddress, relationPointer);
>-    m_assembler.sub32(Assembler::TrustedImm32(1), relationPointer);
>-    m_assembler.mul32(Assembler::TrustedImm32(sizeof(Style::Relation)), relationPointer, relationPointer);
>-    m_assembler.addPtr(dataAddress, relationPointer);
>+    getLastRelationPointer(relationPointer);
> 
>     Assembler::Address typeAddress(relationPointer, OBJECT_OFFSETOF(Style::Relation, type));
>     m_assembler.store32(Assembler::TrustedImm32(relationType), typeAddress);

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