Attachment 360464 Details for Bug 193966 – proposed patch.

[patch] proposed patch.

bug-193966.patch (text/plain), 2.47 KB, created by Mark Lam on 2019-01-29 09:00:41 PST

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Creator: Mark Lam

Created: 2019-01-29 09:00:41 PST

Size: 2.47 KB

patch

obsolete

>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 240658)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,19 @@
>+2019-01-29  Mark Lam  <mark.lam@apple.com>
>+
>+        Remove unneeded CPU(BIG_ENDIAN) handling in LLInt after new bytecode format.
>+        https://bugs.webkit.org/show_bug.cgi?id=193966
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * bytecode/InstructionStream.h:
>+        (JSC::InstructionStreamWriter::write):
>+        - The 32-bit write() function need not invert the order of the bytes written to
>+          the bytecode stream for CPU(BUG_ENDIAN) because the incoming uint32_t value to
>+          be written is already in big endian order for CPU(BUG_ENDIAN) platforms.
>+
>+        * llint/LLIntOfflineAsmConfig.h:
>+        - OFFLINE_ASM_BIG_ENDIAN is no longer needed nor used after the new bytecode format.
>+
> 2019-01-29  Dominik Infuehr  <dinfuehr@igalia.com>
> 
>         [ARM] Check for negative zero instead of just zero
>Index: Source/JavaScriptCore/bytecode/InstructionStream.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/InstructionStream.h	(revision 240656)
>+++ Source/JavaScriptCore/bytecode/InstructionStream.h	(working copy)
>@@ -217,17 +217,14 @@ public:
>             uint32_t i;
>             uint8_t bytes[4];
>         } u { i };
>-#if CPU(BIG_ENDIAN)
>-        write(u.bytes[3]);
>-        write(u.bytes[2]);
>-        write(u.bytes[1]);
>-        write(u.bytes[0]);
>-#else // !CPU(BIG_ENDIAN)
>+
>+        // Though not always obvious, we don't have to invert the order of the
>+        // bytes written here for CPU(BIG_ENDIAN). This is because the incoming
>+        // i value is already ordered in big endian on CPU(BIG_EDNDIAN) platforms.
>         write(u.bytes[0]);
>         write(u.bytes[1]);
>         write(u.bytes[2]);
>         write(u.bytes[3]);
>-#endif // !CPU(BIG_ENDIAN)
>     }
> 
>     void rewind(MutableRef& ref)
>Index: Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h
>===================================================================
>--- Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h	(revision 240656)
>+++ Source/JavaScriptCore/llint/LLIntOfflineAsmConfig.h	(working copy)
>@@ -148,12 +148,6 @@
> #define OFFLINE_ASM_ASSERT_ENABLED 0
> #endif
> 
>-#if CPU(BIG_ENDIAN)
>-#define OFFLINE_ASM_BIG_ENDIAN 1
>-#else
>-#define OFFLINE_ASM_BIG_ENDIAN 0
>-#endif
>-
> #if LLINT_TRACING
> #define OFFLINE_ASM_TRACING 1
> #else

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