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Modify an assert to avoid what looks like a GCC 4.2.4 signed-ness bug.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79494 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner 2009-08-19 23:39:59 +00:00
parent 5e9bb73de6
commit ce4eb39bb4
1 changed files with 5 additions and 3 deletions
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8
lib/Target/X86/X86JITInfo.cpp
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@ -495,9 +495,11 @@ void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub,
// complains about casting a function pointer to a normal pointer.
JCE.startGVStub(F, Stub, 5);
JCE.emitByte(0xE9);
#if defined (X86_64_JIT)
assert(((((intptr_t)Fn-JCE.getCurrentPCValue()-5) << 32) >> 32) ==
((intptr_t)Fn-JCE.getCurrentPCValue()-5)
#if defined (X86_64_JIT) && !defined (NDEBUG)
// Yes, we need both of these casts, or some broken versions of GCC (4.2.4)
// get the signed-ness of the expression wrong. Go figure.
intptr_t Displacement = (intptr_t)Fn - (intptr_t)JCE.getCurrentPCValue() - 5;
assert(((Displacement << 32) >> 32) == Displacement
&& "PIC displacement does not fit in displacement field!");
#endif
JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);