tree 1920ebcbff580430833aa2cdc9543946cb0ccd82
parent 2df0879e7880057293c0a59be6868a3e6ea5105b
author Cherry Zhang <cherryyz@google.com> 1556934491 -0400
committer Ian Lance Taylor <iant@golang.org> 1558048999 +0000

compiler: add intrinsics for runtime/internal/sys functions

runtime/internal/sys.Ctz32/64 and Bswap32/64 are currently
implemented with compiler builtin functions. But if they are
called from another package, the compiler does not know and
therefore cannot turn them into compiler intrinsics. This CL
makes the compiler recognize these functions and turn them into
intrinsics directly, as the gc compiler does.

This CL sets up a way for adding intrinsics in the compiler.
More intrinsics will be added in later CLs.

Also move the handling of runtime.getcallerpc/sp to the new way
of generating intrinsics.

Change-Id: I1929f88327d9035beb860c8b1416198bf8527155
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/176917
Reviewed-by: Ian Lance Taylor <iant@golang.org>