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78 lines
1.9 KiB
LLVM
78 lines
1.9 KiB
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
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target datalayout = "p:32:32"
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; Check some past-the-end subtleties.
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@opte_a = global i32 0
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@opte_b = global i32 0
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; Comparing base addresses of two distinct globals. Never equal.
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define zeroext i1 @no_offsets() {
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%t = icmp eq i32* @opte_a, @opte_b
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ret i1 %t
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; CHECK: no_offsets(
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; CHECK: ret i1 false
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}
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; Comparing past-the-end addresses of two distinct globals. Never equal.
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define zeroext i1 @both_past_the_end() {
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%x = getelementptr i32* @opte_a, i32 1
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%y = getelementptr i32* @opte_b, i32 1
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%t = icmp eq i32* %x, %y
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ret i1 %t
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; CHECK: both_past_the_end(
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; CHECK-NOT: ret i1 true
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; TODO: refine this
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}
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; Comparing past-the-end addresses of one global to the base address
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; of another. Can't fold this.
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define zeroext i1 @just_one_past_the_end() {
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%x = getelementptr i32* @opte_a, i32 1
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%t = icmp eq i32* %x, @opte_b
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ret i1 %t
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; CHECK: just_one_past_the_end(
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; CHECK: ret i1 icmp eq (i32* getelementptr inbounds (i32* @opte_a, i32 1), i32* @opte_b)
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}
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; Comparing base addresses of two distinct allocas. Never equal.
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define zeroext i1 @no_alloca_offsets() {
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%m = alloca i32
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%n = alloca i32
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%t = icmp eq i32* %m, %n
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ret i1 %t
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; CHECK: no_alloca_offsets(
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; CHECK: ret i1 false
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}
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; Comparing past-the-end addresses of two distinct allocas. Never equal.
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define zeroext i1 @both_past_the_end_alloca() {
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%m = alloca i32
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%n = alloca i32
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%x = getelementptr i32* %m, i32 1
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%y = getelementptr i32* %n, i32 1
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%t = icmp eq i32* %x, %y
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ret i1 %t
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; CHECK: both_past_the_end_alloca(
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; CHECK-NOT: ret i1 true
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; TODO: refine this
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}
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; Comparing past-the-end addresses of one alloca to the base address
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; of another. Can't fold this.
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define zeroext i1 @just_one_past_the_end_alloca() {
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%m = alloca i32
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%n = alloca i32
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%x = getelementptr i32* %m, i32 1
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%t = icmp eq i32* %x, %n
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ret i1 %t
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; CHECK: just_one_past_the_end_alloca(
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; CHECK: ret i1 %t
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}
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