* ubsan: undefined shift in sign_extend
@ 2022-08-13 6:50 Alan Modra
0 siblings, 0 replies; only message in thread
From: Alan Modra @ 2022-08-13 6:50 UTC (permalink / raw)
To: binutils
* libhppa.h (sign_extend): Avoid undefined behaviour.
diff --git a/bfd/libhppa.h b/bfd/libhppa.h
index 1de2d5c943b..ebaffe66abf 100644
--- a/bfd/libhppa.h
+++ b/bfd/libhppa.h
@@ -162,7 +162,7 @@ enum hppa_reloc_expr_type_alt
static inline unsigned ATTRIBUTE_UNUSED
sign_extend (unsigned x, unsigned len)
{
- unsigned signbit = (1 << (len - 1));
+ unsigned signbit = (1u << (len - 1));
unsigned mask = (signbit << 1) - 1;
return ((x & mask) ^ signbit) - signbit;
}
--
Alan Modra
Australia Development Lab, IBM
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