[PATCH] D9387: llvm.noalias - Pointer comparison folding should look through them

[Hal Finkel via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL275039: Pointer-comparison folding should look through returned-argument functions (authored by hfinkel).

Changed prior to commit:
  http://reviews.llvm.org/D9387?vs=63345&id=63455#toc

Repository:
  rL LLVM

http://reviews.llvm.org/D9387

Files:
  llvm/trunk/lib/Analysis/InstructionSimplify.cpp
  llvm/trunk/test/Transforms/InstSimplify/returned.ll

Index: llvm/trunk/test/Transforms/InstSimplify/returned.ll
===================================================================
--- llvm/trunk/test/Transforms/InstSimplify/returned.ll
+++ llvm/trunk/test/Transforms/InstSimplify/returned.ll
@@ -0,0 +1,30 @@
+; RUN: opt -instsimplify -S < %s | FileCheck %s
+
+define i1 @bitcast() {
+; CHECK-LABEL: @bitcast(
+  %a = alloca i32
+  %b = alloca i64
+  %x = bitcast i32* %a to i8*
+  %z = bitcast i64* %b to i8*
+  %y = call i8* @func1(i8* %z)
+  %cmp = icmp eq i8* %x, %y
+  ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
+%gept = type { i32, i32 }
+
+define i1 @gep3() {
+; CHECK-LABEL: @gep3(
+  %x = alloca %gept, align 8
+  %a = getelementptr %gept, %gept* %x, i64 0, i32 0
+  %y = call %gept* @func2(%gept* %x)
+  %b = getelementptr %gept, %gept* %y, i64 0, i32 1
+  %equal = icmp eq i32* %a, %b
+  ret i1 %equal
+; CHECK-NEXT: ret i1 false
+}
+
+declare i8* @func1(i8* returned) nounwind readnone
+declare %gept* @func2(%gept* returned) nounwind readnone
+
Index: llvm/trunk/lib/Analysis/InstructionSimplify.cpp
===================================================================
--- llvm/trunk/lib/Analysis/InstructionSimplify.cpp
+++ llvm/trunk/lib/Analysis/InstructionSimplify.cpp
@@ -621,6 +621,11 @@
         break;
       V = GA->getAliasee();
     } else {
+      if (auto CS = CallSite(V))
+        if (Value *RV = CS.getReturnedArgOperand()) {
+          V = RV;
+          continue;
+        }
       break;
     }
     assert(V->getType()->getScalarType()->isPointerTy() &&


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D9387.63455.patch
Type: text/x-patch
Size: 1535 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20160711/3f909aa3/attachment.bin>