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Add a testcase for some past-the-end address subtleties. 

llvm-svn: 174210
This commit is contained in:
Dan Gohman 2013-02-01 19:37:52 +00:00
parent 95a777e915
commit 9ee4bc1abc
1 changed files with 77 additions and 0 deletions
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77
llvm/test/Transforms/InstSimplify/past-the-end.ll Normal file
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; RUN: opt < %s -instsimplify -S | FileCheck %s
target datalayout = "p:32:32"
; Check some past-the-end subtleties.
@opte_a = global i32 0
@opte_b = global i32 0
; Comparing base addresses of two distinct globals. Never equal.
define zeroext i1 @no_offsets() {
%t = icmp eq i32* @opte_a, @opte_b
ret i1 %t
; CHECK: no_offsets(
; CHECK: ret i1 false
}
; Comparing past-the-end addresses of two distinct globals. Never equal.
define zeroext i1 @both_past_the_end() {
%x = getelementptr i32* @opte_a, i32 1
%y = getelementptr i32* @opte_b, i32 1
%t = icmp eq i32* %x, %y
ret i1 %t
; CHECK: both_past_the_end(
; CHECK-NOT: ret i1 true
; TODO: refine this
}
; Comparing past-the-end addresses of one global to the base address
; of another. Can't fold this.
define zeroext i1 @just_one_past_the_end() {
%x = getelementptr i32* @opte_a, i32 1
%t = icmp eq i32* %x, @opte_b
ret i1 %t
; CHECK: just_one_past_the_end(
; CHECK: ret i1 icmp eq (i32* getelementptr inbounds (i32* @opte_a, i32 1), i32* @opte_b)
}
; Comparing base addresses of two distinct allocas. Never equal.
define zeroext i1 @no_alloca_offsets() {
%m = alloca i32
%n = alloca i32
%t = icmp eq i32* %m, %n
ret i1 %t
; CHECK: no_alloca_offsets(
; CHECK: ret i1 false
}
; Comparing past-the-end addresses of two distinct allocas. Never equal.
define zeroext i1 @both_past_the_end_alloca() {
%m = alloca i32
%n = alloca i32
%x = getelementptr i32* %m, i32 1
%y = getelementptr i32* %n, i32 1
%t = icmp eq i32* %x, %y
ret i1 %t
; CHECK: both_past_the_end_alloca(
; CHECK-NOT: ret i1 true
; TODO: refine this
}
; Comparing past-the-end addresses of one alloca to the base address
; of another. Can't fold this.
define zeroext i1 @just_one_past_the_end_alloca() {
%m = alloca i32
%n = alloca i32
%x = getelementptr i32* %m, i32 1
%t = icmp eq i32* %x, %n
ret i1 %t
; CHECK: just_one_past_the_end_alloca(
; CHECK: ret i1 %t
}