[Webkit-unassigned] [Bug 219395] New: [JSC] Aarch64 build failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219395

            Bug ID: 219395
           Summary: [JSC] Aarch64 build failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lmoura at igalia.com

The JSC-Only Aarch64 bot[1] is failing with the following error:

```
/usr/bin/ccache /home/buildbot/linaro/toolchain/bin/aarch64-linux-gnu-g++ --sysroot=/home/buildbot/linaro/toolchain/sysroot  -DBUILDING_JSCONLY__ -DBUILDING_WITH_CMAKE=1 -DHAVE_CONFIG_H=1 -DSTATICALLY_LINKED_WITH_WTF -IDerivedSources/ForwardingHeaders -I. -I../../Source/JavaScriptCore -I../../Source/JavaScriptCore/API -I../../Source/JavaScriptCore/assembler -I../../Source/JavaScriptCore/b3 -I../../Source/JavaScriptCore/b3/air -I../../Source/JavaScriptCore/bindings -I../../Source/JavaScriptCore/builtins -I../../Source/JavaScriptCore/bytecode -I../../Source/JavaScriptCore/bytecompiler -I../../Source/JavaScriptCore/dfg -I../../Source/JavaScriptCore/disassembler -I../../Source/JavaScriptCore/disassembler/ARM64 -I../../Source/JavaScriptCore/disassembler/udis86 -I../../Source/JavaScriptCore/domjit -I../../Source/JavaScriptCore/ftl -I../../Source/JavaScriptCore/heap -I../../Source/JavaScriptCore/debugger -I../../Source/JavaScriptCore/inspector -I../../Source/JavaScriptCore/inspector/agents -I../../Source/JavaScriptCore/inspector/augmentable -I../../Source/JavaScriptCore/inspector/remote -I../../Source/JavaScriptCore/interpreter -I../../Source/JavaScriptCore/jit -I../../Source/JavaScriptCore/llint -I../../Source/JavaScriptCore/parser -I../../Source/JavaScriptCore/profiler -I../../Source/JavaScriptCore/runtime -I../../Source/JavaScriptCore/tools -I../../Source/JavaScriptCore/wasm -I../../Source/JavaScriptCore/wasm/js -I../../Source/JavaScriptCore/yarr -IDerivedSources/JavaScriptCore -IDerivedSources/JavaScriptCore/inspector -IDerivedSources/JavaScriptCore/runtime -IDerivedSources/JavaScriptCore/yarr -fdiagnostics-color=always -Wextra -Wall -Wno-expansion-to-defined -Wno-attributes -Wno-noexcept-type -Wno-psabi -Wno-misleading-indentation -Wno-maybe-uninitialized -Wwrite-strings -Wundef -Wpointer-arith -Wmissing-format-attribute -Wformat-security -Wcast-align -Wno-tautological-compare  -fno-strict-aliasing -fno-exceptions -fno-rtti -O3 -DNDEBUG -fPIC   -std=c++1z -MD -MT Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o -MF Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o.d -o Source/JavaScriptCore/CMakeFiles/LowLevelInterpreterLib.dir/llint/LowLevelInterpreter.cpp.o -c ../../Source/JavaScriptCore/llint/LowLevelInterpreter.cpp
/tmp/ccYwnhHg.s: Assembler messages:
/tmp/ccYwnhHg.s:65123: Error: operand mismatch -- `sxtb x1,x0'
/tmp/ccYwnhHg.s:65123: Info:    did you mean this?
/tmp/ccYwnhHg.s:65123: Info:            sxtb x1, w0
/tmp/ccYwnhHg.s:65123: Info:    other valid variant(s):
/tmp/ccYwnhHg.s:65123: Info:            sxtb w1, w0
...
```

Likely related to r270265, which added the following snippet?

```
--- a/Source/JavaScriptCore/offlineasm/arm64.rb
+++ b/Source/JavaScriptCore/offlineasm/arm64.rb
@@ -901,6 +901,10 @@ class Instruction
             emitARM64("sxtb", operands, [:word, :word])
         when "sxh2i"
             emitARM64("sxth", operands, [:word, :word])
+        when "sxb2q"
+            emitARM64("sxtb", operands, [:quad, :quad])
+        when "sxh2q"
+            emitARM64("sxth", operands, [:quad, :quad])
         when "nop"
             $asm.puts "nop"
         when "bieq", "bbeq"
```

[1] https://build.webkit.org/builders/JSCOnly-Linux-AArch64-Release?numbuilds=50

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