[PATCH] D87255: [PATCH 24/27] [noalias] DeadArgumentElimination

[Jeroen Dobbelaere via Phabricator via llvm-commits]

jeroen.dobbelaere created this revision.
jeroen.dobbelaere added reviewers: hfinkel, jdoerfert.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.
jeroen.dobbelaere requested review of this revision.

DeadArgumentElimination: keep track of !noalias (for Full Restrict) and !alias.scope information for calls that are modified.


https://reviews.llvm.org/D87255

Files:
  llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
  llvm/test/Transforms/DeadArgElim/noalias.ll


Index: llvm/test/Transforms/DeadArgElim/noalias.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/DeadArgElim/noalias.ll
@@ -0,0 +1,25 @@
+; RUN: opt -deadargelim -S < %s | FileCheck %s
+
+; Checks if !noalias metadata is corret in deadargelim.
+
+define void @caller() #0 {
+; CHECK: call void @test_vararg(), !noalias ![[NA:[0-9]]]
+; CHECK: call void @test(), !noalias ![[NA]]
+  call void (i32, ...) @test_vararg(i32 1), !noalias !0
+  call void @test(i32 1), !noalias !0
+  ret void
+}
+
+define internal void @test_vararg(i32, ...) #1 {
+  ret void
+}
+
+define internal void @test(i32 %a) #1 {
+  ret void
+}
+
+; CHECK:![[NA]] = !{![[NA2:[0-9]]]}
+; CHECK:![[NA2]] = distinct !{![[NA2]], !"the var"}
+!0 = !{!1}
+!1 = distinct !{!1, !"the var"}
+
Index: llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
===================================================================
--- llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -207,7 +207,9 @@
     }
     NewCB->setCallingConv(CB->getCallingConv());
     NewCB->setAttributes(PAL);
-    NewCB->copyMetadata(*CB, {LLVMContext::MD_prof, LLVMContext::MD_dbg});
+    NewCB->copyMetadata(*CB,
+                        {LLVMContext::MD_prof, LLVMContext::MD_dbg,
+                         LLVMContext::MD_noalias, LLVMContext::MD_alias_scope});
 
     Args.clear();
 
@@ -935,7 +937,9 @@
     }
     NewCB->setCallingConv(CB.getCallingConv());
     NewCB->setAttributes(NewCallPAL);
-    NewCB->copyMetadata(CB, {LLVMContext::MD_prof, LLVMContext::MD_dbg});
+    NewCB->copyMetadata(CB,
+                        {LLVMContext::MD_prof, LLVMContext::MD_dbg,
+                         LLVMContext::MD_noalias, LLVMContext::MD_alias_scope});
     Args.clear();
     ArgAttrVec.clear();
 


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