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diff --git a/src/longlong.h b/src/longlong.h
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index e880587..023f47e 100644
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--- a/src/longlong.h
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+++ b/src/longlong.h
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@@ -530,23 +530,16 @@ extern UWtype __MPN(udiv_qrnnd) (UWtype *, UWtype, UWtype, UWtype);
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#endif /* __arm__ */
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#if defined (__aarch64__) && W_TYPE_SIZE == 64
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+/* FIXME: Extend the immediate range for the low word by using both
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+ ADDS and SUBS, since they set carry in the same way. */
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#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
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- __asm__ ("adds\t%1, %4, %5\n\tadc\t%0, %2, %3" \
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+ __asm__ ("adds\t%1, %x4, %5\n\tadc\t%0, %x2, %x3" \
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: "=r" (sh), "=&r" (sl) \
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- : "r" (ah), "rZ" (bh), "%r" (al), "rI" (bl) __CLOBBER_CC)
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+ : "rZ" (ah), "rZ" (bh), "%r" (al), "rI" (bl) __CLOBBER_CC)
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#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
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- do { \
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- if (__builtin_constant_p (bl)) \
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- { \
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- __asm__ ("subs\t%1, %4, %5\n\tsbc\t%0, %2, %3" \
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- : "=r" (sh), "=&r" (sl) \
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- : "r" (ah), "r" (bh), "r" (al), "rI" (bl) __CLOBBER_CC); \
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- } \
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- else /* only bh might be a constant */ \
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- __asm__ ("subs\t%1, %4, %5\n\tsbc\t%0, %2, %3" \
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- : "=r" (sh), "=&r" (sl) \
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- : "r" (ah), "rZ" (bh), "r" (al), "rI" (bl) __CLOBBER_CC);\
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- } while (0)
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+ __asm__ ("subs\t%1, %x4, %5\n\tsbc\t%0, %x2, %x3" \
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+ : "=r,r" (sh), "=&r,&r" (sl) \
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+ : "rZ,rZ" (ah), "rZ,rZ" (bh), "r,Z" (al), "rI,r" (bl) __CLOBBER_CC)
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#define umul_ppmm(ph, pl, m0, m1) \
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do { \
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UDItype __m0 = (m0), __m1 = (m1); \
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