[llvm] r302587 - [GVN] Fix a crash on encountering non-integral pointers
Keno Fischer via llvm-commits
llvm-commits at lists.llvm.org
Tue May 9 14:07:20 PDT 2017
Author: kfischer
Date: Tue May 9 16:07:20 2017
New Revision: 302587
URL: http://llvm.org/viewvc/llvm-project?rev=302587&view=rev
Log:
[GVN] Fix a crash on encountering non-integral pointers
Summary:
This fixes the immediate crash caused by introducing an incorrect inttoptr
before attempting the conversion. There may still be a legality
check missing somewhere earlier for non-integral pointers, but this change
seems necessary in any case.
Reviewers: sanjoy, dberlin
Reviewed By: dberlin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D32623
Added:
llvm/trunk/test/Transforms/GVN/PRE/nonintegral.ll
Modified:
llvm/trunk/lib/Transforms/Utils/VNCoercion.cpp
Modified: llvm/trunk/lib/Transforms/Utils/VNCoercion.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/VNCoercion.cpp?rev=302587&r1=302586&r2=302587&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/VNCoercion.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/VNCoercion.cpp Tue May 9 16:07:20 2017
@@ -303,6 +303,15 @@ static T *getStoreValueForLoadHelper(T *
const DataLayout &DL) {
LLVMContext &Ctx = SrcVal->getType()->getContext();
+ // If two pointers are in the same address space, they have the same size,
+ // so we don't need to do any truncation, etc. This avoids introducing
+ // ptrtoint instructions for pointers that may be non-integral.
+ if (SrcVal->getType()->isPointerTy() && LoadTy->isPointerTy() &&
+ cast<PointerType>(SrcVal->getType())->getAddressSpace() ==
+ cast<PointerType>(LoadTy)->getAddressSpace()) {
+ return SrcVal;
+ }
+
uint64_t StoreSize = (DL.getTypeSizeInBits(SrcVal->getType()) + 7) / 8;
uint64_t LoadSize = (DL.getTypeSizeInBits(LoadTy) + 7) / 8;
// Compute which bits of the stored value are being used by the load. Convert
Added: llvm/trunk/test/Transforms/GVN/PRE/nonintegral.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/PRE/nonintegral.ll?rev=302587&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/GVN/PRE/nonintegral.ll (added)
+++ llvm/trunk/test/Transforms/GVN/PRE/nonintegral.ll Tue May 9 16:07:20 2017
@@ -0,0 +1,39 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -gvn -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:4"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @nipre(double addrspace(4)** noalias %p, i64 addrspace(4)** noalias %p2, i8 %jmp) {
+
+; CHECK-LABEL: @nipre(
+; CHECK: [[PCAST:%.*]] = bitcast double addrspace(4)** [[P:%.*]] to i64 addrspace(4)**
+; CHECK: a:
+; CHECK: [[L1:%.*]] = load i64 addrspace(4)*, i64 addrspace(4)** [[PCAST]]
+; CHECK: [[TMP0:%.*]] = bitcast i64 addrspace(4)* [[L1]] to double addrspace(4)*
+; CHECK: b:
+; CHECK: [[L2:%.*]] = load i64 addrspace(4)*, i64 addrspace(4)** [[PCAST]]
+; CHECK: [[TMP1:%.*]] = bitcast i64 addrspace(4)* [[L2]] to double addrspace(4)*
+; CHECK: c:
+; CHECK-NEXT: [[L3_PRE:%.*]] = load double addrspace(4)*, double addrspace(4)** %p
+
+entry:
+ %pcast = bitcast double addrspace(4)** %p to i64 addrspace(4)**
+ switch i8 %jmp, label %c [ i8 0, label %a
+ i8 1, label %b]
+a:
+ %l1 = load i64 addrspace(4)*, i64 addrspace(4)** %pcast
+ store i64 addrspace(4)* %l1, i64 addrspace(4)** %p2
+ br label %tail
+b:
+ %l2 = load i64 addrspace(4)*, i64 addrspace(4)** %pcast
+ store i64 addrspace(4)* %l2, i64 addrspace(4)** %p2
+ br label %tail
+c:
+ br label %tail
+tail:
+ %l3 = load double addrspace(4)*, double addrspace(4)** %p
+ %l3cast = bitcast double addrspace(4)* %l3 to i64 addrspace(4)*
+ store i64 addrspace(4)* %l3cast, i64 addrspace(4)** %p2
+ ret void
+}
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