63dc31b68b
Reapply after https://github.com/llvm/llvm-project/pull/93548, which should address the lldb failure on macos. ----- Do not create icmp/fcmp constant expressions in IRBuilder etc anymore, i.e. treat them as "undesirable". This is in preparation for removing them entirely. Part of: https://discourse.llvm.org/t/rfc-remove-most-constant-expressions/63179
90 lines
2.4 KiB
LLVM
90 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=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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; CHECK-LABEL: @no_offsets(
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; CHECK-NEXT: ret i1 false
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;
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%t = icmp eq ptr @opte_a, @opte_b
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ret i1 %t
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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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; CHECK-LABEL: @both_past_the_end(
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; CHECK-NEXT: [[T:%.*]] = icmp eq ptr getelementptr inbounds (i8, ptr @opte_a, i32 4), getelementptr inbounds (i8, ptr @opte_b, i32 4)
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; CHECK-NEXT: ret i1 [[T]]
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;
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%x = getelementptr i32, ptr @opte_a, i32 1
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%y = getelementptr i32, ptr @opte_b, i32 1
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%t = icmp eq ptr %x, %y
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ret i1 %t
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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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; CHECK-LABEL: @just_one_past_the_end(
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; CHECK-NEXT: [[T:%.*]] = icmp eq ptr getelementptr inbounds (i8, ptr @opte_a, i32 4), @opte_b
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; CHECK-NEXT: ret i1 [[T]]
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;
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%x = getelementptr i32, ptr @opte_a, i32 1
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%t = icmp eq ptr %x, @opte_b
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ret i1 %t
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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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; CHECK-LABEL: @no_alloca_offsets(
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; CHECK-NEXT: ret i1 false
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;
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%m = alloca i32
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%n = alloca i32
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%t = icmp eq ptr %m, %n
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ret i1 %t
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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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; CHECK-LABEL: @both_past_the_end_alloca(
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; CHECK-NEXT: ret i1 false
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;
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%m = alloca i32
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%n = alloca i32
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%x = getelementptr i32, ptr %m, i32 1
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%y = getelementptr i32, ptr %n, i32 1
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%t = icmp eq ptr %x, %y
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ret i1 %t
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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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; CHECK-LABEL: @just_one_past_the_end_alloca(
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; CHECK-NEXT: [[M:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[N:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[X:%.*]] = getelementptr i32, ptr [[M]], i32 1
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; CHECK-NEXT: [[T:%.*]] = icmp eq ptr [[X]], [[N]]
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; CHECK-NEXT: ret i1 [[T]]
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;
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%m = alloca i32
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%n = alloca i32
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%x = getelementptr i32, ptr %m, i32 1
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%t = icmp eq ptr %x, %n
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ret i1 %t
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}
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