From 08ffee539e2f7e5ac1784e9cb8c1cece0e3addae Mon Sep 17 00:00:00 2001 From: Torok Edwin Date: Sat, 24 Jan 2009 17:16:04 +0000 Subject: [PATCH] testcase for PR3381. Also it was an empty struct, not a void after all. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62920 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/InstructionCombining.cpp | 2 +- .../InstCombine/2009-01-24-EmptyStruct.ll | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) create mode 100644 test/Transforms/InstCombine/2009-01-24-EmptyStruct.ll diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index aed08670932..40289eaf6bf 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -11170,7 +11170,7 @@ static Instruction *InstCombineStoreToCast(InstCombiner &IC, StoreInst &SI) { while (1) { if (const StructType *STy = dyn_cast(SrcPTy)) { - if (!STy->getNumElements()) /* Void is represented as {} */ + if (!STy->getNumElements()) /* Struct can be empty {} */ break; NewGEPIndices.push_back(Zero); SrcPTy = STy->getElementType(0); diff --git a/test/Transforms/InstCombine/2009-01-24-EmptyStruct.ll b/test/Transforms/InstCombine/2009-01-24-EmptyStruct.ll new file mode 100644 index 00000000000..313e76d028d --- /dev/null +++ b/test/Transforms/InstCombine/2009-01-24-EmptyStruct.ll @@ -0,0 +1,18 @@ +; RUN: llvm-as < %s | opt -instcombine +; PR3381 +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" +target triple = "x86_64-unknown-linux-gnu" + %struct.atomic_t = type { i32 } + %struct.inode = type { i32, %struct.mutex } + %struct.list_head = type { %struct.list_head*, %struct.list_head* } + %struct.lock_class_key = type { } + %struct.mutex = type { %struct.atomic_t, %struct.rwlock_t, %struct.list_head } + %struct.rwlock_t = type { %struct.lock_class_key } + +define void @handle_event(%struct.inode* %bar) nounwind { +entry: + %0 = getelementptr %struct.inode* %bar, i64 -1, i32 1, i32 1 ; <%struct.rwlock_t*> [#uses=1] + %1 = bitcast %struct.rwlock_t* %0 to i32* ; [#uses=1] + store i32 1, i32* %1, align 4 + ret void +}