llvm-project/llvm/test/CodeGen/Generic/assume.ll

; RUN: llc < %s

define void @main() {
        call void @llvm.assume(i1 1)
        ret void
}

declare void @llvm.assume(i1) nounwind
Add @llvm.assume, lowering, and some basic properties This is the first commit in a series that add an @llvm.assume intrinsic which can be used to provide the optimizer with a condition it may assume to be true (when the control flow would hit the intrinsic call). Some basic properties are added here: - llvm.invariant(true) is dead. - llvm.invariant(false) is unreachable (this directly corresponds to the documented behavior of MSVC's __assume(0)), so is llvm.invariant(undef). The intrinsic is tagged as writing arbitrarily, in order to maintain control dependencies. BasicAA has been updated, however, to return NoModRef for any particular location-based query so that we don't unnecessarily block code motion. llvm-svn: 213973 2014-07-26 05:13:35 +08:00			`; RUN: llc < %s`

			`define void @main() {`
			`call void @llvm.assume(i1 1)`
			`ret void`
			`}`

			`declare void @llvm.assume(i1) nounwind`