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--- a/longlong.h
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+++ b/longlong.h
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@@ -994,8 +994,10 @@ extern UWtype __MPN(udiv_qrnnd) _PROTO (
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count is only an int. */
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#define count_trailing_zeros(count, x) \
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do { \
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+ UDItype __cbtmp; \
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ASSERT ((x) != 0); \
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- __asm__ ("bsfq %1,%q0" : "=r" (count) : "rm" ((UDItype)(x))); \
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+ __asm__ ("bsfq %1,%0" : "=r" (__cbtmp) : "rm" ((UDItype)(x))); \
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+ (count) = __cbtmp; \
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} while (0)
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#endif /* x86_64 */
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