i'm looking into using llvm with
TI's MSP430, for which a C compiler from TI already exists; the idea
here is to use llc -march=c and then pass the generated C code on to
the TI compiler. as it turns out, the TI C compiler supports a number
of (processor-specific) intrinsics that expose much of the underlying
CPU architecture directly to the C programmer -- registers,
pseudo-functions for enabling/disabling interrupts and reading/writing
status bits, etc.
is there a way to leverage these (non-gcc) intrinsics in the llvm
gcc-based frontend -- perhaps flagging their use in such a way that
they effectively "pass through" the optimizer and are emitted "as is"
in the generated C code? in some respects, you can think of this
usage as not unlike dropping inline asm code into the C sources.
bob frankel
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