http://llvm.org/bugs/show_bug.cgi?id=9347
Summary: incorrect result type AltiVec vector comparison
Product: clang
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Given the following example:
typedef signed char int8_t;
typedef unsigned char uint8_t;
typedef __attribute__((ext_vector_type(8))) uint8_t uint8x8_t;
typedef __attribute__((ext_vector_type(8))) int8_t int8x8_t;
uint8x8_t foo(int8x8_t __a, int8x8_t __b) { \
return (uint8x8_t)(__a == __b); }
The expression (__a == __b) should return a vector of 8 chars, but right now,
clang believe that it should returns an int (or bool if C++).
This is due to the following code in Sema::CheckVectorCompareOperands():
// If AltiVec, the comparison results in a numeric type, i.e.
// bool for C++, int for C
if (getLangOptions().AltiVec)
return Context.getLogicalOperationType();
I do not believe this is correct. Removing this condition allows the expression
type to be set correctly.
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