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Fix constant folding of addrspacecast of null

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This should not be making assumptions on the value of
the casted pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270293 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2016-05-21 00:14:04 +00:00
parent d8a1b8c883
commit bca8aba44a
4 changed files with 73 additions and 4 deletions
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3
lib/IR/ConstantFold.cpp
View File

@ -531,7 +531,8 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V,
return UndefValue::get(DestTy);
}
if (V->isNullValue() && !DestTy->isX86_MMXTy())
if (V->isNullValue() && !DestTy->isX86_MMXTy() &&
opc != Instruction::AddrSpaceCast)
return Constant::getNullValue(DestTy);
// If the cast operand is a constant expression, there's a few things we can

14
test/Assembler/ConstantExprFoldCast.ll
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@ -1,8 +1,13 @@
; This test checks to make sure that constant exprs fold in some simple situations
; RUN: llvm-as < %s | llvm-dis | not grep cast
; RUN: llvm-as < %s | llvm-dis | FileCheck %s
; RUN: verify-uselistorder %s
; CHECK-NOT: bitcast
; CHECK-NOT: trunc
; CHECK: addrspacecast
; CHECK: addrspacecast
@A = global i32* bitcast (i8* null to i32*) ; Cast null -> fold
@B = global i32** bitcast (i32** @A to i32**) ; Cast to same type -> fold
@C = global i32 trunc (i64 42 to i32) ; Integral casts
@ -16,6 +21,9 @@
; Address space cast AS0 null-> AS1 null
@H = global i32 addrspace(1)* addrspacecast(i32* null to i32 addrspace(1)*)
; Address space cast AS1 null-> AS0 null
@I = global i32* addrspacecast(i32 addrspace(1)* null to i32*)
; Bitcast -> GEP
@I = external global { i32 }
@J = global i32* bitcast ({ i32 }* @I to i32*)
@J = external global { i32 }
@K = global i32* bitcast ({ i32 }* @J to i32*)

39
test/Transforms/InstCombine/addrspacecast.ll
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@ -145,3 +145,42 @@ end:
ret i32 %sum.inc
}
; CHECK-LABEL: @constant_fold_null(
; CHECK: i32 addrspace(3)* null to i32 addrspace(4)*
define void @constant_fold_null() #0 {
%cast = addrspacecast i32 addrspace(3)* null to i32 addrspace(4)*
store i32 7, i32 addrspace(4)* %cast
ret void
}
; CHECK-LABEL: @constant_fold_undef(
; CHECK: ret i32 addrspace(4)* undef
define i32 addrspace(4)* @constant_fold_undef() #0 {
%cast = addrspacecast i32 addrspace(3)* undef to i32 addrspace(4)*
ret i32 addrspace(4)* %cast
}
; CHECK-LABEL: @constant_fold_null_vector(
; CHECK: addrspacecast (<4 x i32 addrspace(3)*> zeroinitializer to <4 x i32 addrspace(4)*>)
define <4 x i32 addrspace(4)*> @constant_fold_null_vector() #0 {
%cast = addrspacecast <4 x i32 addrspace(3)*> zeroinitializer to <4 x i32 addrspace(4)*>
ret <4 x i32 addrspace(4)*> %cast
}
; CHECK-LABEL: @constant_fold_inttoptr(
; CHECK: addrspacecast (i32 addrspace(3)* inttoptr (i32 -1 to i32 addrspace(3)*) to i32 addrspace(4)*)
define void @constant_fold_inttoptr() #0 {
%cast = addrspacecast i32 addrspace(3)* inttoptr (i32 -1 to i32 addrspace(3)*) to i32 addrspace(4)*
store i32 7, i32 addrspace(4)* %cast
ret void
}
; CHECK-LABEL: @constant_fold_gep_inttoptr(
; CHECK: addrspacecast (i32 addrspace(3)* inttoptr (i64 1274 to i32 addrspace(3)*) to i32 addrspace(4)*)
define void @constant_fold_gep_inttoptr() #0 {
%k = inttoptr i32 1234 to i32 addrspace(3)*
%gep = getelementptr i32, i32 addrspace(3)* %k, i32 10
%cast = addrspacecast i32 addrspace(3)* %gep to i32 addrspace(4)*
store i32 7, i32 addrspace(4)* %cast
ret void
}

21
unittests/IR/ConstantsTest.cpp
View File

@ -155,6 +155,27 @@ TEST(ConstantsTest, PointerCast) {
EXPECT_EQ(Constant::getNullValue(Int32PtrVecTy),
ConstantExpr::getPointerCast(
Constant::getNullValue(Int8PtrVecTy), Int32PtrVecTy));
Type *Int32Ptr1Ty = Type::getInt32PtrTy(C, 1);
ConstantInt *K = ConstantInt::get(Type::getInt64Ty(C), 1234);
// Make sure that addrspacecast of inttoptr is not folded away.
EXPECT_NE(K,
ConstantExpr::getAddrSpaceCast(
ConstantExpr::getIntToPtr(K, Int32PtrTy), Int32Ptr1Ty));
EXPECT_NE(K,
ConstantExpr::getAddrSpaceCast(
ConstantExpr::getIntToPtr(K, Int32Ptr1Ty), Int32PtrTy));
Constant *NullInt32Ptr0 = Constant::getNullValue(Int32PtrTy);
Constant *NullInt32Ptr1 = Constant::getNullValue(Int32Ptr1Ty);
// Make sure that addrspacecast of null is not folded away.
EXPECT_NE(Constant::getNullValue(Int32PtrTy),
ConstantExpr::getAddrSpaceCast(NullInt32Ptr0, Int32Ptr1Ty));
EXPECT_NE(Constant::getNullValue(Int32Ptr1Ty),
ConstantExpr::getAddrSpaceCast(NullInt32Ptr1, Int32PtrTy));
}
#define CHECK(x, y) { \