forked from OSchip/llvm-project
114 lines
4.5 KiB
LLVM
114 lines
4.5 KiB
LLVM
; RUN: opt -attributor -attributor-manifest-internal --attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=1 -S < %s | FileCheck %s --check-prefixes=ATTRIBUTOR
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declare void @deref_phi_user(i32* %a);
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; TEST 1
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; take mininimum of return values
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;
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define i32* @test1(i32* dereferenceable(4) %0, double* dereferenceable(8) %1, i1 zeroext %2) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test1(i32* nonnull dereferenceable(4) "no-capture-maybe-returned" %0, double* nonnull dereferenceable(8) "no-capture-maybe-returned" %1, i1 zeroext %2)
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%4 = bitcast double* %1 to i32*
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%5 = select i1 %2, i32* %0, i32* %4
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ret i32* %5
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}
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; TEST 2
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define i32* @test2(i32* dereferenceable_or_null(4) %0, double* dereferenceable(8) %1, i1 zeroext %2) local_unnamed_addr {
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; ATTRIBUTOR: define dereferenceable_or_null(4) i32* @test2(i32* dereferenceable_or_null(4) "no-capture-maybe-returned" %0, double* nonnull dereferenceable(8) "no-capture-maybe-returned" %1, i1 zeroext %2)
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%4 = bitcast double* %1 to i32*
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%5 = select i1 %2, i32* %0, i32* %4
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ret i32* %5
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}
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; TEST 3
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; GEP inbounds
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define i32* @test3_1(i32* dereferenceable(8) %0) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test3_1(i32* nonnull dereferenceable(8) "no-capture-maybe-returned" %0)
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%ret = getelementptr inbounds i32, i32* %0, i64 1
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ret i32* %ret
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}
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define i32* @test3_2(i32* dereferenceable_or_null(32) %0) local_unnamed_addr {
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; FIXME: Argument should be mark dereferenceable because of GEP `inbounds`.
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; ATTRIBUTOR: define nonnull dereferenceable(16) i32* @test3_2(i32* dereferenceable_or_null(32) "no-capture-maybe-returned" %0)
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%ret = getelementptr inbounds i32, i32* %0, i64 4
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ret i32* %ret
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}
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define i32* @test3_3(i32* dereferenceable(8) %0, i32* dereferenceable(16) %1, i1 %2) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(4) i32* @test3_3(i32* nonnull dereferenceable(8) "no-capture-maybe-returned" %0, i32* nonnull dereferenceable(16) "no-capture-maybe-returned" %1, i1 %2) local_unnamed_addr
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%ret1 = getelementptr inbounds i32, i32* %0, i64 1
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%ret2 = getelementptr inbounds i32, i32* %1, i64 2
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%ret = select i1 %2, i32* %ret1, i32* %ret2
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ret i32* %ret
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}
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; TEST 4
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; Better than known in IR.
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define dereferenceable(4) i32* @test4(i32* dereferenceable(8) %0) local_unnamed_addr {
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; ATTRIBUTOR: define nonnull dereferenceable(8) i32* @test4(i32* nonnull returned dereferenceable(8) "no-capture-maybe-returned" %0)
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ret i32* %0
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}
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; TEST 5
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; loop in which dereferenceabily "grows"
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define void @deref_phi_growing(i32* dereferenceable(4000) %a) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%a.addr.0 = phi i32* [ %a, %entry ], [ %incdec.ptr, %for.inc ]
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; CHECK: call void @deref_phi_user(i32* dereferenceable(4000) %a.addr.0)
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call void @deref_phi_user(i32* %a.addr.0)
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%tmp = load i32, i32* %a.addr.0, align 4
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%cmp = icmp slt i32 %i.0, %tmp
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br i1 %cmp, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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br label %for.end
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for.body: ; preds = %for.cond
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br label %for.inc
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for.inc: ; preds = %for.body
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%incdec.ptr = getelementptr inbounds i32, i32* %a.addr.0, i64 -1
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%inc = add nuw nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond.cleanup
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ret void
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}
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; TEST 6
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; loop in which dereferenceabily "shrinks"
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define void @deref_phi_shrinking(i32* dereferenceable(4000) %a) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%a.addr.0 = phi i32* [ %a, %entry ], [ %incdec.ptr, %for.inc ]
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; CHECK: call void @deref_phi_user(i32* %a.addr.0)
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call void @deref_phi_user(i32* %a.addr.0)
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%tmp = load i32, i32* %a.addr.0, align 4
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%cmp = icmp slt i32 %i.0, %tmp
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br i1 %cmp, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond
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br label %for.end
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for.body: ; preds = %for.cond
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br label %for.inc
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for.inc: ; preds = %for.body
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%incdec.ptr = getelementptr inbounds i32, i32* %a.addr.0, i64 1
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%inc = add nuw nsw i32 %i.0, 1
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br label %for.cond
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for.end: ; preds = %for.cond.cleanup
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ret void
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}
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