https://llvm.org/bugs/show_bug.cgi?id=23324
Bug ID: 23324
Summary: Second argument to signed Neon vtbl functions should
be unsigned
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Headers
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The ARM C Language Extensions document (ACLE) specifies that the second (index)
parameter to the vtbl and vtbx family of functions should be unsigned, even
when the other parameters are signed:
Aarch32:
T vtblN_ST(TxN a, UT b);
T vtbxN_ST(T a, TxN b, UT c);
Aarch64:
T vqtblNQ_ST (T2xN t, UT idx);
T vqtbxNQ_ST (T a, T2xN t, UT idx);
E.g.,
int8x8_t vqtbl1_s8 (int8x16_t a, uint8x8_t b)
Clang declares them to be signed, instead.
GCC has had these correct for Aarch64 since GCC 4.9, though for ARM (Aarch32)
it still has the second value signed.
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