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llvm-mirror/test/Analysis/BasicAA/zext.ll

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[BasicAA] Fix the handling of sext and zext in the analysis of GEPs. Hopefully this will end the GEPs saga! This commit reverts r245394, i.e., it reapplies r221876 while incorporating the fixes from D11847. r221876 was not reapplied alone because it was not safe and D11847 was not applied alone because it needs r221876 to produce correct results. This should fix PR24596. Original commit message for r221876: Let's try this again... This reverts r219432, plus a bug fix. Description of the bug in r219432 (by Nick): The bug was using AllPositive to break out of the loop; if the loop break condition i != e is changed to i != e && AllPositive then the test_modulo_analysis_with_global test I've added will fail as the Modulo will be calculated incorrectly (as the last loop iteration is skipped, so Modulo isn't updated with its Scale). Nick also adds this comment: ComputeSignBit is safe to use in loops as it takes into account phi nodes, and the == EK_ZeroEx check is safe in loops as, no matter how the variable changes between iterations, zero-extensions will always guarantee a zero sign bit. The isValueEqualInPotentialCycles check is therefore definitely not needed as all the variable analysis holds no matter how the variables change between loop iterations. And this patch also adds another enhancement to GetLinearExpression - basically to convert ConstantInts to Offsets (see test_const_eval and test_const_eval_scaled for the situations this improves). Original commit message: This reverts r218944, which reverted r218714, plus a bug fix. Description of the bug in r218714 (by Nick): The original patch forgot to check if the Scale in VariableGEPIndex flipped the sign of the variable. The BasicAA pass iterates over the instructions in the order they appear in the function, and so BasicAliasAnalysis::aliasGEP is called with the variable it first comes across as parameter GEP1. Adding a %reorder label puts the definition of %a after %b so aliasGEP is called with %b as the first parameter and %a as the second. aliasGEP later calculates that %a == %b + 1 - %idxprom where %idxprom >= 0 (if %a was passed as the first parameter it would calculate %b == %a - 1 + %idxprom where %idxprom >= 0) - ignoring that %idxprom is scaled by -1 here lead the patch to incorrectly conclude that %a > %b. Revised patch by Nick White, thanks! Thanks to Lang to isolating the bug. Slightly modified by me to add an early exit from the loop and avoid unnecessary, but expensive, function calls. Original commit message: Two related things: 1. Fixes a bug when calculating the offset in GetLinearExpression. The code previously used zext to extend the offset, so negative offsets were converted to large positive ones. 2. Enhance aliasGEP to deduce that, if the difference between two GEP allocations is positive and all the variables that govern the offset are also positive (i.e. the offset is strictly after the higher base pointer), then locations that fit in the gap between the two base pointers are NoAlias. Patch by Nick White! Message from D11847: Un-revert of r241981 and fix for PR23626. The 'Or' case of GetLinearExpression delegates to 'Add' if possible, and if not it returns an Opaque value. Unfortunately the Scale and Offsets weren't being set (and so defaulted to 0) - and a scale of zero effectively removes the variable from the GEP instruction. This meant that BasicAA would return MustAliases when it should have been returning PartialAliases (and PR23626 was an example of the GVN pass using an incorrect MustAlias to merge loads from what should have been different pointers). Differential Revision: http://reviews.llvm.org/D11847 Patch by Nick White <n.j.white@gmail.com>! llvm-svn: 246502
2015-09-01 00:32:47 +02:00
; 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, i8* %1, i64 8
%2 = getelementptr inbounds i8, i8* %1, i64 16
%3 = zext i32 3 to i64
%b = getelementptr inbounds i8, 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, i8* %1, i64 8
%2 = getelementptr inbounds i8, i8* %1, i64 16
%3 = lshr i64 %i, 2
%b = getelementptr inbounds i8, i8* %2, i64 %3
ret void
}
; CHECK-LABEL: test_with_a_loop
; CHECK: NoAlias: i8* %a, i8* %b
define void @test_with_a_loop(i8* %mem) {
br label %for.loop
for.loop:
%i = phi i32 [ 0, %0 ], [ %i.plus1, %for.loop ]
%a = getelementptr inbounds i8, i8* %mem, i64 8
%a.plus1 = getelementptr inbounds i8, i8* %mem, i64 16
%i.64 = zext i32 %i to i64
%b = getelementptr inbounds i8, i8* %a.plus1, i64 %i.64
%i.plus1 = add nuw nsw i32 %i, 1
%cmp = icmp eq i32 %i.plus1, 10
br i1 %cmp, label %for.loop.exit, label %for.loop
for.loop.exit:
ret void
}
; CHECK-LABEL: test_with_varying_base_pointer_in_loop
; CHECK: NoAlias: i8* %a, i8* %b
define void @test_with_varying_base_pointer_in_loop(i8* %mem.orig) {
br label %for.loop
for.loop:
%mem = phi i8* [ %mem.orig, %0 ], [ %mem.plus1, %for.loop ]
%i = phi i32 [ 0, %0 ], [ %i.plus1, %for.loop ]
%a = getelementptr inbounds i8, i8* %mem, i64 8
%a.plus1 = getelementptr inbounds i8, i8* %mem, i64 16
%i.64 = zext i32 %i to i64
%b = getelementptr inbounds i8, i8* %a.plus1, i64 %i.64
%i.plus1 = add nuw nsw i32 %i, 1
%mem.plus1 = getelementptr inbounds i8, i8* %mem, i64 8
%cmp = icmp eq i32 %i.plus1, 10
br i1 %cmp, 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, 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, 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], [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], [8 x i32]* %values, i64 0, i64 1
br label %for.loop
for.loop.exit:
ret void
}
@b = global i32 0, align 4
@d = global i32 0, align 4
; CHECK-LABEL: test_spec2006
; CHECK: PartialAlias: i32** %x, i32** %y
define void @test_spec2006() {
%h = alloca [1 x [2 x i32*]], align 16
%d.val = load i32, i32* @d, align 4
%d.promoted = sext i32 %d.val to i64
%1 = icmp slt i32 %d.val, 2
br i1 %1, label %.lr.ph, label %3
.lr.ph: ; preds = %0
br label %2
; <label>:2 ; preds = %.lr.ph, %2
%i = phi i32 [ %d.val, %.lr.ph ], [ %i.plus1, %2 ]
%i.promoted = sext i32 %i to i64
%x = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 %d.promoted, i64 %i.promoted
%i.plus1 = add nsw i32 %i, 1
%cmp = icmp slt i32 %i.plus1, 2
br i1 %cmp, label %2, label %3
; <label>:3 ; preds = %._crit_edge, %0
%y = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 0, i64 1
ret void
}
; CHECK-LABEL: test_modulo_analysis_easy_case
; CHECK: NoAlias: i32** %x, i32** %y
define void @test_modulo_analysis_easy_case(i64 %i) {
%h = alloca [1 x [2 x i32*]], align 16
%x = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 %i, i64 0
%y = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 0, i64 1
ret void
}
; CHECK-LABEL: test_modulo_analysis_in_loop
; CHECK: NoAlias: i32** %x, i32** %y
define void @test_modulo_analysis_in_loop() {
%h = alloca [1 x [2 x i32*]], align 16
br label %for.loop
for.loop:
%i = phi i32 [ 0, %0 ], [ %i.plus1, %for.loop ]
%i.promoted = sext i32 %i to i64
%x = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 %i.promoted, i64 0
%y = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 0, i64 1
%i.plus1 = add nsw i32 %i, 1
%cmp = icmp slt i32 %i.plus1, 2
br i1 %cmp, label %for.loop, label %for.loop.exit
for.loop.exit:
ret void
}
; CHECK-LABEL: test_modulo_analysis_with_global
; CHECK: PartialAlias: i32** %x, i32** %y
define void @test_modulo_analysis_with_global() {
%h = alloca [1 x [2 x i32*]], align 16
%b = load i32, i32* @b, align 4
%b.promoted = sext i32 %b to i64
br label %for.loop
for.loop:
%i = phi i32 [ 0, %0 ], [ %i.plus1, %for.loop ]
%i.promoted = sext i32 %i to i64
%x = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 %i.promoted, i64 %b.promoted
%y = getelementptr inbounds [1 x [2 x i32*]], [1 x [2 x i32*]]* %h, i64 0, i64 0, i64 1
%i.plus1 = add nsw i32 %i, 1
%cmp = icmp slt i32 %i.plus1, 2
br i1 %cmp, label %for.loop, label %for.loop.exit
for.loop.exit:
ret void
}
; CHECK-LABEL: test_const_eval
; CHECK: NoAlias: i8* %a, i8* %b
define void @test_const_eval(i8* %ptr, i64 %offset) {
%a = getelementptr inbounds i8, i8* %ptr, i64 %offset
%a.dup = getelementptr inbounds i8, i8* %ptr, i64 %offset
%three = zext i32 3 to i64
%b = getelementptr inbounds i8, i8* %a.dup, i64 %three
ret void
}
; CHECK-LABEL: test_const_eval_scaled
; CHECK: MustAlias: i8* %a, i8* %b
define void @test_const_eval_scaled(i8* %ptr) {
%three = zext i32 3 to i64
%six = mul i64 %three, 2
%a = getelementptr inbounds i8, i8* %ptr, i64 %six
%b = getelementptr inbounds i8, i8* %ptr, i64 6
ret void
}
; CHECK-LABEL: Function: foo
; CHECK: MustAlias: float* %arrayidx, float* %arrayidx4.84
define float @foo(i32 *%A, float %rend, float** %wayar) {
entry:
%x0 = load i32, i32* %A, align 4
%conv = sext i32 %x0 to i64
%mul = shl nsw i64 %conv, 3
%call = tail call i8* @malloc(i64 %mul)
%x1 = bitcast i8* %call to float*
%sub = add nsw i32 %x0, -1
%idxprom = sext i32 %sub to i64
%arrayidx = getelementptr inbounds float, float* %x1, i64 %idxprom
store float %rend, float* %arrayidx, align 8
%indvars.iv76.83 = add nsw i64 %conv, -1
%arrayidx4.84 = getelementptr inbounds float, float* %x1, i64 %indvars.iv76.83
%x4 = load float, float* %arrayidx4.84, align 8
ret float %x4
}
; Function Attrs: nounwind
declare noalias i8* @malloc(i64)
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