https://bugs.llvm.org/show_bug.cgi?id=44276
Bug ID: 44276
Summary: [PowerPC] vec_splats cannot be used to initialize
variables with static storage duration
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Headers
Assignee: unassignedclangb...@nondot.org
Reporter: colin.samp...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
nemanja.i....@gmail.com, richard-l...@metafoo.co.uk
Compiling the following C code:
#include <altivec.h>
static vector int a = vec_splats(1);
int main() { return 0; }
results in:
test2.c:2:23: error: initializer element is not a compile-time constant
static vector int a = vec_splats(1);
This compiles on GCC and when compiled as C++ (although not in a C++ constexpr
context).
The definition of vec_splats from altivec.h is:
static __inline__ vector int __ATTRS_o_ai vec_splats(int __a) {
return (vector int)(__a);
}
By manually inlining it, the program compiles:
#include <altivec.h>
static vector int a = (vector int)(1);
int main() { return 0; }
vec_promote is similar in that it GCC allows it to be used to initialize a
variable with static storage duration; however, the present implementation in
LLVM does not allow static initialization even when manually inlined.
I guess the issue here is use of functions rather than macros, but using macros
would run into the same issue as bug #44241; is there some better way to do
this?
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