Win64 calling convention and MM/XMM registers passed explicitly & indirectly doesn't work

[kobalicek]

Passing MM and XMM registers doesn't work when using Win64 calling convention.

Win64 requires to pass a pointer into an aligned memory where the content of MM/XMM register is stored.

This only applies to functions like this:

void func_a(__m128 xmmRegByValue);
void func_b(__m64 mmRegByValue);

Other functions that use float/double arguments are supported.

[kobalicek]

Update

• Commit f986f7f adds support for calling functions that have XMM|YMM|ZMM registers passed by value that work with both Windows64 and SystemV ABIs.
• Generating functions that use XMM|YMM|ZMM arguments passed by value indirectly (through pointer or pointer on stack) is still not supported on Windows in 64-bit mode.