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llvm-project/clang/test/CodeGenCXX/cxx11-initializer-array-new.cpp
Pete Cooper 7bfd5cb7be Change memcpy/memset/memmove to have dest and source alignments. 
This is a follow on from a similar LLVM commit: r253511.

Note, this was reviewed (and more details are in) http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151109/312083.html

These intrinsics currently have an explicit alignment argument which is
required to be a constant integer.  It represents the alignment of the
source and dest, and so must be the minimum of those.

This change allows source and dest to each have their own alignments
by using the alignment attribute on their arguments.  The alignment
argument itself is removed.

The only code change to clang is hidden in CGBuilder.h which now passes
both dest and source alignment to IRBuilder, instead of taking the minimum of
dest and source alignments.

Reviewed by Hal Finkel.

llvm-svn: 253512
2015-11-18 22:18:45 +00:00

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// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++11 %s -emit-llvm -o - | FileCheck %s
// PR10878
struct S { S(); S(int); ~S(); int n; };
void *p = new S[2][3]{ { 1, 2, 3 }, { 4, 5, 6 } };
// CHECK-LABEL: define
// CHECK: %[[ALLOC:.*]] = call noalias i8* @_Znam(i64 32)
// CHECK: %[[COOKIE:.*]] = bitcast i8* %[[ALLOC]] to i64*
// CHECK: store i64 6, i64* %[[COOKIE]]
// CHECK: %[[START_AS_i8:.*]] = getelementptr inbounds i8, i8* %[[ALLOC]], i64 8
// CHECK: %[[START_AS_S:.*]] = bitcast i8* %[[START_AS_i8]] to %[[S:.*]]*
//
// Explicit initializers:
//
// { 1, 2, 3 }
//
// CHECK: %[[S_0:.*]] = bitcast %[[S]]* %[[START_AS_S]] to [3 x %[[S]]]*
//
// CHECK: %[[S_0_0:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_0]], i64 0, i64 0
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_0]], i32 1)
// CHECK: %[[S_0_1:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_0_0]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_1]], i32 2)
// CHECK: %[[S_0_2:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_0_1]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_2]], i32 3)
//
// { 4, 5, 6 }
//
// CHECK: %[[S_1:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_0]], i64 1
//
// CHECK: %[[S_1_0:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_1]], i64 0, i64 0
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_0]], i32 4)
// CHECK: %[[S_1_1:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_1_0]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_1]], i32 5)
// CHECK: %[[S_1_2:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_1_1]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_2]], i32 6)
//
// CHECK-NOT: br i1
// CHECK-NOT: call
// CHECK: }
int n;
void *q = new S[n][3]{ { 1, 2, 3 }, { 4, 5, 6 } };
// CHECK-LABEL: define
//
// CHECK: load i32, i32* @n
// CHECK: call {{.*}} @llvm.umul.with.overflow.i64(i64 %[[N:.*]], i64 12)
// CHECK: %[[ELTS:.*]] = mul i64 %[[N]], 3
// CHECK: call {{.*}} @llvm.uadd.with.overflow.i64(i64 %{{.*}}, i64 8)
// CHECK: %[[ALLOC:.*]] = call noalias i8* @_Znam(i64 %{{.*}})
//
// CHECK: %[[COOKIE:.*]] = bitcast i8* %[[ALLOC]] to i64*
// CHECK: store i64 %[[ELTS]], i64* %[[COOKIE]]
// CHECK: %[[START_AS_i8:.*]] = getelementptr inbounds i8, i8* %[[ALLOC]], i64 8
// CHECK: %[[START_AS_S:.*]] = bitcast i8* %[[START_AS_i8]] to %[[S]]*
//
// Explicit initializers:
//
// { 1, 2, 3 }
//
// CHECK: %[[S_0:.*]] = bitcast %[[S]]* %[[START_AS_S]] to [3 x %[[S]]]*
//
// CHECK: %[[S_0_0:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_0]], i64 0, i64 0
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_0]], i32 1)
// CHECK: %[[S_0_1:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_0_0]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_1]], i32 2)
// CHECK: %[[S_0_2:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_0_1]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_0_2]], i32 3)
//
// { 4, 5, 6 }
//
// CHECK: %[[S_1:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_0]], i64 1
//
// CHECK: %[[S_1_0:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_1]], i64 0, i64 0
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_0]], i32 4)
// CHECK: %[[S_1_1:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_1_0]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_1]], i32 5)
// CHECK: %[[S_1_2:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_1_1]], i64 1
// CHECK: call void @_ZN1SC1Ei(%[[S]]* %[[S_1_2]], i32 6)
//
// And the rest.
//
// CHECK: %[[S_2:.*]] = getelementptr inbounds [3 x %[[S]]], [3 x %[[S]]]* %[[S_1]], i64 1
// CHECK: %[[S_2_AS_S:.*]] = bitcast [3 x %[[S]]]* %[[S_2]] to %[[S]]*
//
// CHECK: %[[REST:.*]] = sub i64 %[[ELTS]], 6
// CHECK: icmp eq i64 %[[REST]], 0
// CHECK: br i1
//
// CHECK: %[[END:.*]] = getelementptr inbounds %[[S]], %[[S]]* %[[S_2_AS_S]], i64 %[[REST]]
// CHECK: br label
//
// CHECK: %[[CUR:.*]] = phi %[[S]]* [ %[[S_2_AS_S]], {{.*}} ], [ %[[NEXT:.*]], {{.*}} ]
// CHECK: call void @_ZN1SC1Ev(%[[S]]* %[[CUR]])
// CHECK: %[[NEXT]] = getelementptr inbounds %[[S]], %[[S]]* %[[CUR]], i64 1
// CHECK: icmp eq %[[S]]* %[[NEXT]], %[[END]]
// CHECK: br i1
//
// CHECK: }
struct T { int a; };
void *r = new T[n][3]{ { 1, 2, 3 }, { 4, 5, 6 } };
// CHECK-LABEL: define
//
// CHECK: load i32, i32* @n
// CHECK: call {{.*}} @llvm.umul.with.overflow.i64(i64 %[[N:.*]], i64 12)
// CHECK: %[[ELTS:.*]] = mul i64 %[[N]], 3
//
// No cookie.
// CHECK-NOT: @llvm.uadd.with.overflow
//
// CHECK: %[[ALLOC:.*]] = call noalias i8* @_Znam(i64 %{{.*}})
//
// CHECK: %[[START_AS_T:.*]] = bitcast i8* %[[ALLOC]] to %[[T:.*]]*
//
// Explicit initializers:
//
// { 1, 2, 3 }
//
// CHECK: %[[T_0:.*]] = bitcast %[[T]]* %[[START_AS_T]] to [3 x %[[T]]]*
//
// CHECK: %[[T_0_0:.*]] = getelementptr inbounds [3 x %[[T]]], [3 x %[[T]]]* %[[T_0]], i64 0, i64 0
// CHECK: %[[T_0_0_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_0_0]], i32 0, i32 0
// CHECK: store i32 1, i32* %[[T_0_0_0]]
// CHECK: %[[T_0_1:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_0_0]], i64 1
// CHECK: %[[T_0_1_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_0_1]], i32 0, i32 0
// CHECK: store i32 2, i32* %[[T_0_1_0]]
// CHECK: %[[T_0_2:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_0_1]], i64 1
// CHECK: %[[T_0_2_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_0_2]], i32 0, i32 0
// CHECK: store i32 3, i32* %[[T_0_2_0]]
//
// { 4, 5, 6 }
//
// CHECK: %[[T_1:.*]] = getelementptr inbounds [3 x %[[T]]], [3 x %[[T]]]* %[[T_0]], i64 1
//
// CHECK: %[[T_1_0:.*]] = getelementptr inbounds [3 x %[[T]]], [3 x %[[T]]]* %[[T_1]], i64 0, i64 0
// CHECK: %[[T_1_0_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_1_0]], i32 0, i32 0
// CHECK: store i32 4, i32* %[[T_1_0_0]]
// CHECK: %[[T_1_1:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_1_0]], i64 1
// CHECK: %[[T_1_1_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_1_1]], i32 0, i32 0
// CHECK: store i32 5, i32* %[[T_1_1_0]]
// CHECK: %[[T_1_2:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_1_1]], i64 1
// CHECK: %[[T_1_2_0:.*]] = getelementptr inbounds %[[T]], %[[T]]* %[[T_1_2]], i32 0, i32 0
// CHECK: store i32 6, i32* %[[T_1_2_0]]
//
// And the rest gets memset to 0.
//
// CHECK: %[[T_2:.*]] = getelementptr inbounds [3 x %[[T]]], [3 x %[[T]]]* %[[T_1]], i64 1
// CHECK: %[[T_2_AS_T:.*]] = bitcast [3 x %[[T]]]* %[[T_2]] to %[[T]]*
//
// CHECK: %[[SIZE:.*]] = sub i64 %{{.*}}, 24
// CHECK: %[[REST:.*]] = bitcast %[[T]]* %[[T_2_AS_T]] to i8*
// CHECK: call void @llvm.memset.p0i8.i64(i8* align 4 %[[REST]], i8 0, i64 %[[SIZE]], i1 false)
//
// CHECK: }
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