to memcpy. (Such a memcpy is technically illegal, but in practice is safe
and is generated by struct self-assignment in C code.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91621
91177308-0d34-0410-b5e6-
96231b3b80d8
Intrinsic::getDeclaration(M, MemCpyID, Tys, 1));
Changed = true;
}
+ }
+ if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) {
// memmove(x,x,size) -> noop.
- if (MMI->getSource() == MMI->getDest())
+ if (MTI->getSource() == MTI->getDest())
return EraseInstFromFunction(CI);
}
--- /dev/null
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+declare void @llvm.memcpy.i32(i8*, i8*, i32, i32)
+
+define void @test4(i8* %a) {
+ tail call void @llvm.memcpy.i32( i8* %a, i8* %a, i32 100, i32 1 )
+ ret void
+}
+; CHECK: define void @test4
+; CHECK-NEXT: ret void