gcc-style __asm__

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1

Is gcc style inline assembly only supported in x86 as reviewed here: https://reviews.llvm.org/D36371

or is it supported on other platforms as well?

If so, where is that documented?

2

No, GCC style inline assembly is supported everywhere. However, while, Clang aims for compatibility with GCC and GNU assembler idioms, but it does not always succeed. Set your expectations accordingly.