[PATCH] D64103: Teach ValueTracking that aarch64.irg result aliases its input.

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis created this revision.
eugenis added reviewers: javed.absar, olista01.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D64103

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Analysis/ValueTracking/aarch64.irg.ll


Index: llvm/test/Analysis/ValueTracking/aarch64.irg.ll
===================================================================
--- /dev/null
+++ llvm/test/Analysis/ValueTracking/aarch64.irg.ll
@@ -0,0 +1,18 @@
+; RUN: opt -S -instsimplify -instcombine < %s | FileCheck %s
+
+; CHECK-LABEL: define void @checkNonnullIrg()
+define void @checkNonnullIrg() {
+; CHECK:   %[[p:.*]] = call i8* @llvm.aarch64.irg(i8* nonnull
+; CHECK:   call void @use(i8* nonnull %[[p]])
+entry:
+  %0 = alloca i8, align 16
+
+  %p = call i8* @llvm.aarch64.irg(i8* %0, i64 5)
+  call void @use(i8* %p)
+
+  ret void
+}
+
+declare i8* @llvm.aarch64.irg(i8*, i64)
+
+declare void @use(i8*)
Index: llvm/lib/Analysis/ValueTracking.cpp
===================================================================
--- llvm/lib/Analysis/ValueTracking.cpp
+++ llvm/lib/Analysis/ValueTracking.cpp
@@ -3697,7 +3697,8 @@
 bool llvm::isIntrinsicReturningPointerAliasingArgumentWithoutCapturing(
     const CallBase *Call) {
   return Call->getIntrinsicID() == Intrinsic::launder_invariant_group ||
-         Call->getIntrinsicID() == Intrinsic::strip_invariant_group;
+         Call->getIntrinsicID() == Intrinsic::strip_invariant_group ||
+         Call->getIntrinsicID() == Intrinsic::aarch64_irg;
 }
 
 /// \p PN defines a loop-variant pointer to an object.  Check if the


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D64103.207628.patch
Type: text/x-patch
Size: 1327 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20190702/845a3e2f/attachment.bin>