sorry, I didn't have altivec enabled and didn't know that it has to be
enabled also for cl style vector casts.
therefore (float4)(a,b,c,d) compiles comma operators, i.e. (float4)(d).
...which is not would you expect when you explicitly request
AltiVec-support! (Hence my bug report:
6412 – AltiVec-style vector literals)
This has also reminded me of another gripe I have.
Could anyone tell me please why Clang compiles this
typedef float float4 __attribute__((ext_vector_type(4)));
float4 vadd4(float4 a, float4 b) { return a+b; }
into
define <2 x double> @vadd4(<2 x double>, <2 x double>) nounwind {
???
Note that <4 x float> is converted to <2 x double> even when
cgOpts.OptimizationLevel=0, cgOpts.DisableLLVMOpts=1. But e.g. float17
compiles as expected?
Anton L.