[llvm-dev] Preserving Call to Intrinsic function

[Kumail Ahmed via llvm-dev]

Hello everyone,


Consider we have this following set of code:

int foo() {

int a,b;
a = __builtin_XX(0x11);
b = __builtin_XX(0x11);
return a+b;
}

The problem currently is that LLVM eliminated the second call and copied
the result from the first call into a new set of registers. Is there is a
way to force LLVM to generate two explicit calls to a builtin function. The
builtin takes in an integer type, and also returns back an integer type:

  def int_XX : GCCBuiltin<"__builtin_XX">, Intrinsic<[llvm_i32_ty],
[llvm_i32_ty]>;

Is there some flag that I'm missing? Your help will be really appreciated.


Best Regards,
Kumail Ahmed
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