1 ; RUN: opt -basicaa -dse -S < %s | FileCheck %s 2 3 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind 4 5 define void @fn(i8* nocapture %buf) #0 { 6 entry: 7 8 ; We would not eliminate the first memcpy with data layout, and we should not 9 ; eliminate it without data layout. 10 ; CHECK-LABEL: @fn 11 ; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64 12 ; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64 13 ; CHECK: ret void 14 15 %arrayidx = getelementptr i8, i8* %buf, i64 18 16 tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arrayidx, i8* %buf, i64 18, i32 1, i1 false) 17 store i8 1, i8* %arrayidx, align 1 18 tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %buf, i8* %arrayidx, i64 18, i32 1, i1 false) 19 ret void 20 } 21 22
