forked from pool/mono-core
23 lines
701 B
Diff
23 lines
701 B
Diff
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Index: mono/io-layer/atomic.h
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===================================================================
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--- mono/io-layer/atomic.h (revision 87799)
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+++ mono/io-layer/atomic.h (revision 87800)
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@@ -710,13 +710,16 @@
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gint32 exch, gint32 comp)
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{
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gint32 old;
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+ guint64 real_comp;
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#ifdef __INTEL_COMPILER
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old = _InterlockedCompareExchange (dest, exch, comp);
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#else
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+ /* cmpxchg4 zero extends the value read from memory */
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+ real_comp = (guint64)(guint32)comp;
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asm volatile ("mov ar.ccv = %2 ;;\n\t"
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"cmpxchg4.acq %0 = [%1], %3, ar.ccv\n\t"
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- : "=r" (old) : "r" (dest), "r" (comp), "r" (exch));
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+ : "=r" (old) : "r" (dest), "r" (real_comp), "r" (exch));
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#endif
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return(old);
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