Hi Bradley,
We usually try to avoid using inline assembly for intrinsics, even if it does
mean an extra LLVM patch. In this case, it would be better to do more thorough
analysis anyway to avoid rather dodgy diagnostics like:
$ cat tmp.c
unsigned rsr() {
return __builtin_arm_rsr("21:2:3:4:5");
}
$ clang -c tmp.c -arch arm64
<inline asm>:1:10: error: expected readable system register
mrs x8, S21_2_C3_C4_5
(Or possibly worse if someone is using -fno-integrated-as).
Cheers.
Tim.
http://reviews.llvm.org/D6247
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