File: gep-alias.ll

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llvm-toolchain-20 1%3A20.1.8-1
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -passes=instcombine -S -o - %s | FileCheck %s
; Test that we don't replace an alias with its aliasee when simplifying GEPs.
; In this test case the transformation is invalid because it replaces the
; reference to the symbol "b" (which refers to whichever instance of "b"
; was chosen by the linker) with a reference to "a" (which refers to the
; specific instance of "b" in this module).

target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@a = internal global [3 x ptr] zeroinitializer
@b = linkonce_odr alias [3 x ptr], ptr @a

define ptr @f() {
; CHECK-LABEL: define ptr @f() {
; CHECK-NEXT:    ret ptr getelementptr (i8, ptr @b, i64 8)
;
  ret ptr getelementptr ([3 x ptr], ptr @b, i64 0, i64 1)
}