[PATCH] D79277: [Attributor] Bitcast constant to the returned value type if it has different type

[Sergey Dmitriev via Phabricator via llvm-commits]

sdmitriev created this revision.
sdmitriev added a reviewer: jdoerfert.
Herald added subscribers: llvm-commits, uenoku, hiraditya.
Herald added a reviewer: sstefan1.
Herald added a reviewer: uenoku.
Herald added a project: LLVM.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79277

Files:
  llvm/lib/Transforms/IPO/AttributorAttributes.cpp
  llvm/test/Transforms/Attributor/returned_crash.ll


Index: llvm/test/Transforms/Attributor/returned_crash.ll
===================================================================
--- llvm/test/Transforms/Attributor/returned_crash.ll
+++ llvm/test/Transforms/Attributor/returned_crash.ll
@@ -1,9 +1,23 @@
 ; RUN: opt -attributor -S %s | FileCheck %s
 ; RUN: opt -passes=attributor -S %s | FileCheck %s
-;
-; CHECK: define i32 addrspace(1)* @foo(i32 addrspace(4)* nofree readnone %arg)
+
+ at var = internal global [1 x i32] undef
+
+; CHECK-LABEL: define i32 addrspace(1)* @foo(i32 addrspace(4)* nofree readnone %arg)
 define i32 addrspace(1)* @foo(i32 addrspace(4)* %arg) {
 entry:
   %0 = addrspacecast i32 addrspace(4)* %arg to i32 addrspace(1)*
   ret i32 addrspace(1)* %0
 }
+
+define i32* @func1() {
+  %ptr = call i32* @func1a([1 x i32]* @var)
+  ret i32* %ptr
+}
+
+; CHECK-LABEL: define internal nonnull align 4 dereferenceable(4) i32* @func1a()
+; CHECK-NEXT: ret i32* getelementptr inbounds ([1 x i32], [1 x i32]* @var, i32 0, i32 0)
+define internal i32* @func1a([1 x i32]* %arg) {
+  %ptr = getelementptr inbounds [1 x i32], [1 x i32]* %arg, i64 0, i64 0
+  ret i32* %ptr
+}
Index: llvm/lib/Transforms/IPO/AttributorAttributes.cpp
===================================================================
--- llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -4534,6 +4534,9 @@
             for (ReturnInst *RI : RetInsts) {
               if (RI->getFunction() != getAnchorScope())
                 continue;
+              if (C->getType() != RI->getReturnValue()->getType())
+                C = ConstantExpr::getBitCast(C,
+                                             RI->getReturnValue()->getType());
               LLVM_DEBUG(dbgs() << "[ValueSimplify] " << V << " -> " << *C
                                 << " in " << *RI << " :: " << *this << "\n");
               if (A.changeUseAfterManifest(RI->getOperandUse(0), *C))


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