llvm-project/llvm/test/CodeGen/PowerPC/2008-01-25-EmptyFunction.ll

// RUN: %llvmgcc -O2 -S -o - -emit-llvm %s | grep llvm.trap
// RUN: %llvmgcc -O2 -S -o - -emit-llvm %s | grep unreachable

void bork() {
  int *address = 0;
  *address = 0;
}
If we have a function like this: void bork() { int address = 0; address = 0; } It's compiled into LLVM code that looks like this: define void @bork() noreturn nounwind { entry: unreachable } This is bad on some platforms (like PPC) because it will generate the label for the function but no body. The label could end up being associated with some non-code related stuff, like a section. This places a "trap" instruction if the SimplifyCFG pass removed all code from the function leaving only one "unreachable" instruction. llvm-svn: 46387 2008-01-26 09:43:44 +08:00			`// RUN: %llvmgcc -O2 -S -o - -emit-llvm %s \| grep llvm.trap`
			`// RUN: %llvmgcc -O2 -S -o - -emit-llvm %s \| grep unreachable`

			`void bork() {`
			`int *address = 0;`
			`*address = 0;`
			`}`