[PATCH] D152145: [InstSimplify] Fold all global variables with initializers
Anshil Gandhi via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jun 5 11:25:51 PDT 2023
gandhi21299 updated this revision to Diff 528527.
gandhi21299 added a comment.
Added checks for NullIsUnknownSize and EvalMode to handle interposable cases.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D152145/new/
https://reviews.llvm.org/D152145
Files:
llvm/lib/Analysis/MemoryBuiltins.cpp
llvm/test/Transforms/InstSimplify/gv-alloca-cmp.ll
Index: llvm/test/Transforms/InstSimplify/gv-alloca-cmp.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/InstSimplify/gv-alloca-cmp.ll
@@ -0,0 +1,46 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
+
+ at gv = global i64 zeroinitializer, align 16
+
+define i1 @cmp_gv_alloca() {
+; CHECK-LABEL: define i1 @cmp_gv_alloca() {
+; CHECK-NEXT: ret i1 false
+;
+ %alloca = alloca i64, align 8
+ %cmp = icmp eq ptr %alloca, @gv
+ ret i1 %cmp
+}
+
+ at gv_externally_init = externally_initialized global i64 zeroinitializer, align 16
+
+define i1 @cmp_gv_alloca_extern_init() {
+; CHECK-LABEL: define i1 @cmp_gv_alloca_extern_init() {
+; CHECK-NEXT: ret i1 false
+;
+ %alloca = alloca i64, align 8
+ %cmp = icmp eq ptr %alloca, @gv_externally_init
+ ret i1 %cmp
+}
+
+ at const_gv = protected addrspace(4) externally_initialized global [4096 x i64] zeroinitializer, align 16
+define i1 @cmp_gv_alloca_cast() {
+; CHECK-LABEL: define i1 @cmp_gv_alloca_cast() {
+; CHECK-NEXT: ret i1 false
+;
+ %alloca = alloca i64, align 8, addrspace(5)
+ %cast.alloca = addrspacecast ptr addrspace(5) %alloca to ptr
+ %cmp = icmp eq ptr %cast.alloca, addrspacecast (ptr addrspace(4) @const_gv to ptr)
+ ret i1 %cmp
+}
+
+ at gv_weak = weak global i64 zeroinitializer, align 16
+
+define i1 @cmp_gv_weak_alloca() {
+; CHECK-LABEL: define i1 @cmp_gv_weak_alloca() {
+; CHECK-NEXT: ret i1 false
+;
+ %alloca = alloca i64, align 8
+ %cmp = icmp eq ptr %alloca, @gv_weak
+ ret i1 %cmp
+}
Index: llvm/lib/Analysis/MemoryBuiltins.cpp
===================================================================
--- llvm/lib/Analysis/MemoryBuiltins.cpp
+++ llvm/lib/Analysis/MemoryBuiltins.cpp
@@ -826,7 +826,11 @@
}
SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalVariable(GlobalVariable &GV){
- if (!GV.hasDefinitiveInitializer())
+ if (!GV.hasInitializer())
+ return unknown();
+
+ if (GV.isInterposable() && (Options.NullIsUnknownSize ||
+ Options.EvalMode != ObjectSizeOpts::Mode::Min))
return unknown();
APInt Size(IntTyBits, DL.getTypeAllocSize(GV.getValueType()));
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