Value *Result = GetLinearExpression(CastOp, Scale, Offset, Extension,
DL, Depth+1, AT, DT);
Scale = Scale.zext(OldWidth);
-
- // We have to sign-extend even if Extension == EK_ZeroExt as we can't
- // decompose a sign extension (i.e. zext(x - 1) != zext(x) - zext(-1)).
- Offset = Offset.sext(OldWidth);
+ Offset = Offset.zext(OldWidth);
return Result;
}
// Grab the least significant bit set in any of the scales.
if (!GEP1VariableIndices.empty()) {
uint64_t Modulo = 0;
- bool AllPositive = true;
- for (unsigned i = 0, e = GEP1VariableIndices.size();
- i != e && AllPositive; ++i) {
- const Value *V = GEP1VariableIndices[i].V;
+ for (unsigned i = 0, e = GEP1VariableIndices.size(); i != e; ++i)
Modulo |= (uint64_t)GEP1VariableIndices[i].Scale;
-
- bool SignKnownZero, SignKnownOne;
- ComputeSignBit(
- const_cast<Value *>(V),
- SignKnownZero, SignKnownOne,
- DL, 0, AT, nullptr, DT);
-
- // Zero-extension widens the variable, and so forces the sign
- // bit to zero.
- bool IsZExt = GEP1VariableIndices[i].Extension == EK_ZeroExt;
- SignKnownZero |= IsZExt;
- SignKnownOne &= !IsZExt;
-
- // If the variable begins with a zero then we know it's
- // positive, regardless of whether the value is signed or
- // unsigned.
- int64_t Scale = GEP1VariableIndices[i].Scale;
- AllPositive &=
- (SignKnownZero && Scale >= 0) ||
- (SignKnownOne && Scale < 0);
-
- // If the Value is currently positive but could change in a cycle,
- // then we can't guarantee it'll always br positive.
- if (AllPositive && !isValueEqualInPotentialCycles(V, V))
- AllPositive = false;
- }
-
Modulo = Modulo ^ (Modulo & (Modulo - 1));
// We can compute the difference between the two addresses
if (V1Size != UnknownSize && V2Size != UnknownSize &&
ModOffset >= V2Size && V1Size <= Modulo - ModOffset)
return NoAlias;
-
- // If we know all the variables are positive, then GEP1 >= GEP1BasePtr.
- // If GEP1BasePtr > V2 (GEP1BaseOffset > 0) then we know the pointers
- // don't alias if V2Size can fit in the gap between V2 and GEP1BasePtr.
- if (AllPositive && GEP1BaseOffset > 0 && V2Size <= (uint64_t) GEP1BaseOffset)
- return NoAlias;
}
// Statically, we can see that the base objects are the same, but the
+++ /dev/null
-; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
-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"
-target triple = "x86_64-unknown-linux-gnu"
-
-; CHECK-LABEL: test_with_zext
-; CHECK: NoAlias: i8* %a, i8* %b
-
-define void @test_with_zext() {
- %1 = tail call i8* @malloc(i64 120)
- %a = getelementptr inbounds i8* %1, i64 8
- %2 = getelementptr inbounds i8* %1, i64 16
- %3 = zext i32 3 to i64
- %b = getelementptr inbounds i8* %2, i64 %3
- ret void
-}
-
-; CHECK-LABEL: test_with_lshr
-; CHECK: NoAlias: i8* %a, i8* %b
-
-define void @test_with_lshr(i64 %i) {
- %1 = tail call i8* @malloc(i64 120)
- %a = getelementptr inbounds i8* %1, i64 8
- %2 = getelementptr inbounds i8* %1, i64 16
- %3 = lshr i64 %i, 2
- %b = getelementptr inbounds i8* %2, i64 %3
- ret void
-}
-
-; CHECK-LABEL: test_with_a_loop
-; CHECK: NoAlias: i8* %a, i8* %b
-
-define void @test_with_a_loop() {
- %1 = tail call i8* @malloc(i64 120)
- %a = getelementptr inbounds i8* %1, i64 8
- %2 = getelementptr inbounds i8* %1, i64 16
- br label %for.loop
-
-for.loop:
- %i = phi i32 [ 0, %0 ], [ %i.next, %for.loop ]
- %3 = zext i32 %i to i64
- %b = getelementptr inbounds i8* %2, i64 %3
- %i.next = add nuw nsw i32 %i, 1
- %4 = icmp eq i32 %i.next, 10
- br i1 %4, label %for.loop.exit, label %for.loop
-
-for.loop.exit:
- ret void
-}
-
-; CHECK-LABEL: test_sign_extension
-; CHECK: PartialAlias: i64* %b.i64, i8* %a
-
-define void @test_sign_extension(i32 %p) {
- %1 = tail call i8* @malloc(i64 120)
- %p.64 = zext i32 %p to i64
- %a = getelementptr inbounds i8* %1, i64 %p.64
- %p.minus1 = add i32 %p, -1
- %p.minus1.64 = zext i32 %p.minus1 to i64
- %b.i8 = getelementptr inbounds i8* %1, i64 %p.minus1.64
- %b.i64 = bitcast i8* %b.i8 to i64*
- ret void
-}
-
-; CHECK-LABEL: test_fe_tools
-; CHECK: PartialAlias: i32* %a, i32* %b
-
-define void @test_fe_tools([8 x i32]* %values) {
- br label %reorder
-
-for.loop:
- %i = phi i32 [ 0, %reorder ], [ %i.next, %for.loop ]
- %idxprom = zext i32 %i to i64
- %b = getelementptr inbounds [8 x i32]* %values, i64 0, i64 %idxprom
- %i.next = add nuw nsw i32 %i, 1
- %1 = icmp eq i32 %i.next, 10
- br i1 %1, label %for.loop.exit, label %for.loop
-
-reorder:
- %a = getelementptr inbounds [8 x i32]* %values, i64 0, i64 1
- br label %for.loop
-
-for.loop.exit:
- ret void
-}
-
-; Function Attrs: nounwind
-declare noalias i8* @malloc(i64)