Commit 121643dc authored by Hans Wennborg's avatar Hans Wennborg
Browse files

Merging r245395: 

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r245395 | qcolombet | 2015-08-18 17:08:26 -0700 (Tue, 18 Aug 2015) | 3 lines

[BasicAA] Add a test for PR24468 to be sure we won't regress
when we finally get the GEP aliasing right.

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llvm-svn: 245478
parent 0d824c98

llvm/test/Analysis/BasicAA/gep-alias.ll

+48 −0
Original line number Diff line number Diff line
@@ -228,3 +228,51 @@ define i32 @test12(i32 %x, i32 %y, i8* %p) nounwind { 
; CHECK-LABEL: @test12(

; CHECK: ret i32 %r

}



@P = internal global i32 715827882, align 4

@Q = internal global i32 715827883, align 4

@.str = private unnamed_addr constant [7 x i8] c"%u %u\0A\00", align 1



; Make sure we recognize that u[0] and u[Global + Cst] may alias

; when the addition has wrapping semantic.

; PR24468.

; CHECK-LABEL: @test13(

; Make sure the stores appear before the related loads.

; CHECK: store i8 42,

; CHECK: store i8 99,

; Find the loads and make sure they are used in the arguments to the printf.

; CHECK: [[T0ADDR:%[a-zA-Z0-9_]+]] = getelementptr inbounds [3 x i8], [3 x i8]* %t, i32 0, i32 0

; CHECK: [[T0:%[a-zA-Z0-9_]+]] = load i8, i8* [[T0ADDR]], align 1

; CHECK: [[T0ARG:%[a-zA-Z0-9_]+]] = zext i8 [[T0]] to i32

; CHECK: [[U0ADDR:%[a-zA-Z0-9_]+]] = getelementptr inbounds [3 x i8], [3 x i8]* %u, i32 0, i32 0

; CHECK: [[U0:%[a-zA-Z0-9_]+]] = load i8, i8* [[U0ADDR]], align 1

; CHECK: [[U0ARG:%[a-zA-Z0-9_]+]] = zext i8 [[U0]] to i32

; CHECK: call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i32 0, i32 0), i32 [[T0ARG]], i32 [[U0ARG]])

; CHECK: ret

define void @test13() {

entry:

  %t = alloca [3 x i8], align 1

  %u = alloca [3 x i8], align 1

  %tmp = load i32, i32* @P, align 4

  %tmp1 = mul i32 %tmp, 3

  %mul = add i32 %tmp1, -2147483646

  %idxprom = zext i32 %mul to i64

  %arrayidx = getelementptr inbounds [3 x i8], [3 x i8]* %t, i64 0, i64 %idxprom

  store i8 42, i8* %arrayidx, align 1

  %tmp2 = load i32, i32* @Q, align 4

  %tmp3 = mul i32 %tmp2, 3

  %mul2 = add i32 %tmp3, 2147483647

  %idxprom3 = zext i32 %mul2 to i64

  %arrayidx4 = getelementptr inbounds [3 x i8], [3 x i8]* %u, i64 0, i64 %idxprom3

  store i8 99, i8* %arrayidx4, align 1

  %arrayidx5 = getelementptr inbounds [3 x i8], [3 x i8]* %t, i64 0, i64 0

  %tmp4 = load i8, i8* %arrayidx5, align 1

  %conv = zext i8 %tmp4 to i32

  %arrayidx6 = getelementptr inbounds [3 x i8], [3 x i8]* %u, i64 0, i64 0

  %tmp5 = load i8, i8* %arrayidx6, align 1

  %conv7 = zext i8 %tmp5 to i32

  %call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i32 %conv, i32 %conv7)

  ret void

}



declare i32 @printf(i8*, ...)