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[GVN] Don't coerce non-integral pointers to integers or vice versa 

Summary:
See http://llvm.org/docs/LangRef.html#non-integral-pointer-type

The NewGVN test does not fail without these changes (perhaps it does
try to coerce pointers <-> integers to begin with?), but I added the
test case anyway.

Reviewers: dberlin

Subscribers: mcrosier, llvm-commits, Prazek

Differential Revision: https://reviews.llvm.org/D32208

llvm-svn: 300730
This commit is contained in:
Sanjoy Das 2017-04-19 18:21:09 +00:00
parent a5b9d3c11a
commit 5945447d84
3 changed files with 83 additions and 0 deletions
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5
llvm/lib/Transforms/Utils/VNCoercion.cpp
View File

@ -24,6 +24,11 @@ bool canCoerceMustAliasedValueToLoad(Value *StoredVal, Type *LoadTy,
if (DL.getTypeSizeInBits(StoredVal->getType()) < DL.getTypeSizeInBits(LoadTy))
return false;
// Don't coerce non-integral pointers to integers or vice versa.
if (DL.isNonIntegralPointerType(StoredVal->getType()) !=
DL.isNonIntegralPointerType(LoadTy))
return false;
return true;
}

39
llvm/test/Transforms/GVN/non-integral-pointers.ll Normal file
View File

@ -0,0 +1,39 @@
; 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 @f0(i1 %alwaysFalse, i64 %val, i64* %loc) {
; CHECK-LABEL: @f0(
; CHECK-NOT: inttoptr
; CHECK-NOT: ptrtoint
entry:
store i64 %val, i64* %loc
br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
neverTaken:
%loc.bc = bitcast i64* %loc to i8 addrspace(4)**
%ptr = load i8 addrspace(4)*, i8 addrspace(4)** %loc.bc
store i8 5, i8 addrspace(4)* %ptr
ret void
alwaysTaken:
ret void
}
define i64 @f1(i1 %alwaysFalse, i8 addrspace(4)* %val, i8 addrspace(4)** %loc) {
; CHECK-LABEL: @f1(
; CHECK-NOT: inttoptr
; CHECK-NOT: ptrtoint
entry:
store i8 addrspace(4)* %val, i8 addrspace(4)** %loc
br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
neverTaken:
%loc.bc = bitcast i8 addrspace(4)** %loc to i64*
%int = load i64, i64* %loc.bc
ret i64 %int
alwaysTaken:
ret i64 42
}

39
llvm/test/Transforms/NewGVN/non-integral-pointers.ll Normal file
View File

@ -0,0 +1,39 @@
; RUN: opt -newgvn -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 @f0(i1 %alwaysFalse, i64 %val, i64* %loc) {
; CHECK-LABEL: @f0(
; CHECK-NOT: inttoptr
; CHECK-NOT: ptrtoint
entry:
store i64 %val, i64* %loc
br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
neverTaken:
%loc.bc = bitcast i64* %loc to i8 addrspace(4)**
%ptr = load i8 addrspace(4)*, i8 addrspace(4)** %loc.bc
store i8 5, i8 addrspace(4)* %ptr
ret void
alwaysTaken:
ret void
}
define i64 @f1(i1 %alwaysFalse, i8 addrspace(4)* %val, i8 addrspace(4)** %loc) {
; CHECK-LABEL: @f1(
; CHECK-NOT: inttoptr
; CHECK-NOT: ptrtoint
entry:
store i8 addrspace(4)* %val, i8 addrspace(4)** %loc
br i1 %alwaysFalse, label %neverTaken, label %alwaysTaken
neverTaken:
%loc.bc = bitcast i8 addrspace(4)** %loc to i64*
%int = load i64, i64* %loc.bc
ret i64 %int
alwaysTaken:
ret i64 42
}