[Webkit-unassigned] [Bug 29779] New: Hard dependency on SSE instruction set with JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=29779

           Summary: Hard dependency on SSE instruction set with JIT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: plaes at plaes.org


It seems that a while ago JIT code has hard dependency on machines with SSE
instruction set, as it has hardcoded xorpd instruction into the source. This
breaks at least athlon-xp machines on x86 platform:

Program received signal SIGILL, Illegal instruction.
[Switching to Thread 0xb463b940 (LWP 10463)]
0xae14e01a in ?? ()
(gdb) x/8i $pc
0xae14e01a:    xorpd  %xmm0,%xmm0
0xae14e01e:    movsd  (%edi),%xmm1
0xae14e022:    ucomisd %xmm1,%xmm0
0xae14e026:    je     0xae14e1ce
0xae14e02c:    mov    $0xae340080,%eax
0xae14e031:    mov    0xaf051c3c,%edx
0xae14e037:    cmp    0x4(%eax),%edx
0xae14e03a:    jne    0xae14e60d


There's also similar bug report on debian bugtracker:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=548339

processor    : 0
vendor_id    : AuthenticAMD
cpu family    : 6
model        : 6
model name    : AMD Athlon(tm) XP 2000+
stepping    : 2
cpu MHz        : 1663.937
cache size    : 256 KB
fdiv_bug    : no
hlt_bug        : no
f00f_bug    : no
coma_bug    : no
fpu        : yes
fpu_exception    : yes
cpuid level    : 1
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips    : 3327.87
clflush size    : 32
power management: ts

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