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target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
; ptr_phi and ptr2_phi do not alias.
; CHECK: test_noalias_1
; CHECK: NoAlias: i32* %ptr2_phi, i32* %ptr_phi
; CHECK: NoAlias: i32* %ptr2_inc, i32* %ptr_inc
define i32 @test_noalias_1(i32* %ptr2, i32 %count, i32* %coeff) {
entry:
%ptr = getelementptr inbounds i32, i32* %ptr2, i64 1
br label %while.body
while.body:
%num = phi i32 [ %count, %entry ], [ %dec, %while.body ]
%ptr_phi = phi i32* [ %ptr, %entry ], [ %ptr_inc, %while.body ]
%ptr2_phi = phi i32* [ %ptr2, %entry ], [ %ptr2_inc, %while.body ]
%result.09 = phi i32 [ 0 , %entry ], [ %add, %while.body ]
%dec = add nsw i32 %num, -1
%0 = load i32, i32* %ptr_phi, align 4
store i32 %0, i32* %ptr2_phi, align 4
%1 = load i32, i32* %coeff, align 4
%2 = load i32, i32* %ptr_phi, align 4
%mul = mul nsw i32 %1, %2
%add = add nsw i32 %mul, %result.09
%tobool = icmp eq i32 %dec, 0
%ptr_inc = getelementptr inbounds i32, i32* %ptr_phi, i64 1
%ptr2_inc = getelementptr inbounds i32, i32* %ptr2_phi, i64 1
br i1 %tobool, label %the_exit, label %while.body
the_exit:
ret i32 %add
}
; CHECK: test_noalias_2
; CHECK: NoAlias: i32* %ptr_outer_phi, i32* %ptr_outer_phi2
; CHECK: NoAlias: i32* %ptr2_inc_outer, i32* %ptr_inc_outer
; CHECK: NoAlias: i32* %ptr2_phi, i32* %ptr_phi
; CHECK: NoAlias: i32* %ptr2_inc, i32* %ptr_inc
define i32 @test_noalias_2(i32* %ptr2, i32 %count, i32* %coeff) {
entry:
%ptr = getelementptr inbounds i32, i32* %ptr2, i64 1
br label %outer.while.header
outer.while.header:
%ptr_outer_phi = phi i32* [%ptr_inc_outer, %outer.while.backedge], [ %ptr, %entry]
%ptr_outer_phi2 = phi i32* [%ptr2_inc_outer, %outer.while.backedge], [ %ptr2, %entry]
%num.outer = phi i32 [ %count, %entry ], [ %dec.outer, %outer.while.backedge ]
br label %while.body
while.body:
%num = phi i32 [ %count, %outer.while.header ], [ %dec, %while.body ]
%ptr_phi = phi i32* [ %ptr_outer_phi, %outer.while.header ], [ %ptr_inc, %while.body ]
%ptr2_phi = phi i32* [ %ptr_outer_phi2, %outer.while.header ], [ %ptr2_inc, %while.body ]
%result.09 = phi i32 [ 0 , %outer.while.header ], [ %add, %while.body ]
%dec = add nsw i32 %num, -1
%0 = load i32, i32* %ptr_phi, align 4
store i32 %0, i32* %ptr2_phi, align 4
%1 = load i32, i32* %coeff, align 4
%2 = load i32, i32* %ptr_phi, align 4
%mul = mul nsw i32 %1, %2
%add = add nsw i32 %mul, %result.09
%tobool = icmp eq i32 %dec, 0
%ptr_inc = getelementptr inbounds i32, i32* %ptr_phi, i64 1
%ptr2_inc = getelementptr inbounds i32, i32* %ptr2_phi, i64 1
br i1 %tobool, label %outer.while.backedge, label %while.body
outer.while.backedge:
%ptr_inc_outer = getelementptr inbounds i32, i32* %ptr_phi, i64 1
%ptr2_inc_outer = getelementptr inbounds i32, i32* %ptr2_phi, i64 1
%dec.outer = add nsw i32 %num.outer, -1
%br.cond = icmp eq i32 %dec.outer, 0
br i1 %br.cond, label %the_exit, label %outer.while.header
the_exit:
ret i32 %add
}
; CHECK: test_noalias_3
; CHECK: MayAlias: i8* %ptr2_phi, i8* %ptr_phi
define i32 @test_noalias_3(i8* noalias %x, i8* noalias %y, i8* noalias %z,
i32 %count) {
entry:
br label %while.body
while.body:
%num = phi i32 [ %count, %entry ], [ %dec, %while.body ]
%ptr_phi = phi i8* [ %x, %entry ], [ %z, %while.body ]
%ptr2_phi = phi i8* [ %y, %entry ], [ %ptr_phi, %while.body ]
%dec = add nsw i32 %num, -1
%tobool = icmp eq i32 %dec, 0
br i1 %tobool, label %the_exit, label %while.body
the_exit:
ret i32 1
}
; CHECK-LABEL: test_different_stride_noalias
; CHECK: NoAlias: i16* %y.base, i8* %x.base
; CHECK: NoAlias: i16* %y, i8* %x
; CHECK: NoAlias: i16* %y.next, i8* %x.next
define void @test_different_stride_noalias(i1 %c, i8* noalias %x.base, i16* noalias %y.base) {
entry:
br label %loop
loop:
%x = phi i8* [ %x.base, %entry ], [ %x.next, %loop ]
%y = phi i16* [ %y.base, %entry ], [ %y.next, %loop ]
%x.next = getelementptr i8, i8* %x, i64 1
%y.next = getelementptr i16, i16* %y, i64 1
br i1 %c, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_no_loop_mustalias
; CHECK: MustAlias: i16* %z16, i8* %z8
define void @test_no_loop_mustalias(i1 %c, i8* noalias %x8, i8* noalias %y8) {
br i1 %c, label %if, label %else
if:
%x16 = bitcast i8* %x8 to i16*
br label %end
else:
%y16 = bitcast i8* %y8 to i16*
br label %end
end:
%z8 = phi i8* [ %x8, %if ], [ %y8, %else ]
%z16 = phi i16* [ %x16, %if ], [ %y16, %else ]
ret void
}
; CHECK-LABEL: test_same_stride_mustalias
; CHECK: MustAlias: i4* %y.base, i8* %x.base
; CHECK: MayAlias: i4* %y, i8* %x
; CHECK: MayAlias: i4* %y.next, i8* %x.next
; TODO: (x, y) could be MustAlias
define void @test_same_stride_mustalias(i1 %c, i8* noalias %x.base) {
entry:
%y.base = bitcast i8* %x.base to i4*
br label %loop
loop:
%x = phi i8* [ %x.base, %entry ], [ %x.next, %loop ]
%y = phi i4* [ %y.base, %entry ], [ %y.next, %loop ]
%x.next = getelementptr i8, i8* %x, i64 1
%y.next = getelementptr i4, i4* %y, i64 1
br i1 %c, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_different_stride_mustalias
; CHECK: MustAlias: i16* %y.base, i8* %x.base
; CHECK: MayAlias: i16* %y, i8* %x
; CHECK: MayAlias: i16* %y.next, i8* %x.next
; Even though the base pointers MustAlias, the different strides don't preserve
; this property across iterations.
define void @test_different_stride_mustalias(i1 %c, i8* noalias %x.base) {
entry:
%y.base = bitcast i8* %x.base to i16*
br label %loop
loop:
%x = phi i8* [ %x.base, %entry ], [ %x.next, %loop ]
%y = phi i16* [ %y.base, %entry ], [ %y.next, %loop ]
%x.next = getelementptr i8, i8* %x, i64 1
%y.next = getelementptr i16, i16* %y, i64 1
br i1 %c, label %loop, label %exit
exit:
ret void
}
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