llvm-project/llvm/test/Transforms/InstCombine/invariant.ll

17 lines
553 B
LLVM

; Test to make sure unused llvm.invariant.start calls are not trivially eliminated
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @g(i8*)
declare { }* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly
define i8 @f() {
%a = alloca i8 ; <i8*> [#uses=4]
store i8 0, i8* %a
%i = call { }* @llvm.invariant.start(i64 1, i8* %a) ; <{ }*> [#uses=0]
; CHECK: call { }* @llvm.invariant.start
call void @g(i8* %a)
%r = load i8* %a ; <i8> [#uses=1]
ret i8 %r
}