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clang (assertions trunk)
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; We should strip the dereferenceable callsite attribute on spec call's argument since it is ; can cause UB in the speculatable call when hoisted to preheader. ; However, we need not strip the nonnull attribute since it just propagates ; poison if the parameter was indeed null. define void @test_strip_attribute(ptr noalias %loc, ptr noalias %sink, ptr %q) { ; CHECK-LABEL: @test_strip_attribute( ; CHECK-NEXT: entry: ; CHECK-NEXT: [[RET:%.*]] = call i32 @load(ptr [[LOC:%.*]]) ; CHECK-NEXT: [[NULLCHK:%.*]] = icmp eq ptr [[Q:%.*]], null ; CHECK-NEXT: [[RET2:%.*]] = call i32 @spec(ptr nonnull [[Q]], ptr [[LOC]]) ; CHECK-NEXT: br label [[LOOP:%.*]] ; CHECK: loop: ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[ISNULL:%.*]] ] ; CHECK-NEXT: br i1 [[NULLCHK]], label [[ISNULL]], label [[NONNULLBB:%.*]] entry: br label %loop loop: %iv = phi i32 [0, %entry], [%iv.next, %isnull ] %ret = call i32 @load(ptr %loc) %nullchk = icmp eq ptr %q, null br i1 %nullchk, label %isnull, label %nonnullbb nonnullbb: %ret2 = call i32 @spec(ptr nonnull %q, ptr dereferenceable(12) %loc), !prof !0 br label %isnull isnull: store volatile i32 %ret, ptr %sink %iv.next = add i32 %iv, 1 %cmp = icmp slt i32 %iv, 200 br i1 %cmp, label %loop, label %exit exit: ret void } declare i32 @load(ptr %p) argmemonly readonly nounwind declare i32 @spec(ptr %p, ptr %q) readonly argmemonly nounwind speculatable declare void @store(i32 %val, ptr %p) argmemonly writeonly nounwind !0 = !{!"branch_weights", i32 95}
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