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Teach BasicAA about the LLVM IR rules that allow reading past the end of an object given sufficient alignment. Fixes PR12098.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151553 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2012-02-27 20:46:07 +00:00
parent 9e2a79c287
commit 1680a24e53
3 changed files with 52 additions and 10 deletions
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25
test/Analysis/BasicAA/aligned-overread.ll Normal file
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@ -0,0 +1,25 @@
; RUN: opt < %s -basicaa -dse -S | 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-apple-macosx10.8.0"
%struct.S0 = type <{ i8, [4 x i8] }>
@a = global { i8, i8, i8, i8, i8 } { i8 undef, i8 0, i8 0, i8 0, i8 0 }, align 8
define i32 @main() nounwind uwtable ssp {
entry:
%tmp = load i8* getelementptr inbounds ({ i8, i8, i8, i8, i8 }* @a, i64 0, i32 4), align 4
%tmp1 = or i8 %tmp, -128
store i8 %tmp1, i8* getelementptr inbounds ({ i8, i8, i8, i8, i8 }* @a, i64 0, i32 4), align 4
%tmp2 = load i64* bitcast ({ i8, i8, i8, i8, i8 }* @a to i64*), align 8
store i8 11, i8* getelementptr inbounds ({ i8, i8, i8, i8, i8 }* @a, i64 0, i32 4), align 4
%tmp3 = trunc i64 %tmp2 to i32
ret i32 %tmp3
; Make sure we don't delete either store here
; CHECK: @main
; CHECK: store i8 %tmp1
; CHECK: store i8 11
}

2
test/Analysis/BasicAA/global-size.ll
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@ -4,7 +4,7 @@
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
@B = global i16 8
@B = global i16 8, align 2
; CHECK: @test1
define i16 @test1(i32* %P) {