How to hint types when compiling with llvm-gcc?

In some C code, I'm defining a simple static array as a function argument, say:

void foo(float color[3]);

When I compile it with llvm-gcc, it produces the following LLVM assembly language output:

define void @foo(float* %n1) nounwind ssp {

Is there any way I can hint to the compiler that I'd like it to generate code using an LLVM array [3 x float] or vector <3 x float&g开发者_运维百科t; on the stack, instead of a pointer?

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void foo(float color[3]); is defined by the C standard to be equivalent to void foo(float *color);. Maybe you want void foo(float (*color)[3]), or struct vec { float elems[3]; }; void foo(struct vec color);?

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Generally speaking, you cannot. It's C standard / platform ABI which defines the layout of your types, etc.

If you want such fine control over IR emission you'd need to do this by hands (or modify clang, etc.)