Change the IR-generation of VLAs so that we capture bounds,
not sizes; so that we use well-typed allocas; and so that we
properly recurse through the full set of variably-modified types.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133827 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/vla.cpp b/test/CodeGenCXX/vla.cpp
new file mode 100644
index 0000000..cee00f2
--- /dev/null
+++ b/test/CodeGenCXX/vla.cpp
@@ -0,0 +1,43 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin %s -emit-llvm -o - | FileCheck %s
+
+// rdar://problem/9506377
+void test0(void *array, int n) {
+ // CHECK: define void @_Z5test0Pvi(
+ // CHECK: [[ARRAY:%.*]] = alloca i8*, align 8
+ // CHECK-NEXT: [[N:%.*]] = alloca i32, align 4
+ // CHECK-NEXT: [[REF:%.*]] = alloca i16*, align 8
+ // CHECK-NEXT: [[S:%.*]] = alloca i16, align 2
+ // CHECK-NEXT: store i8*
+ // CHECK-NEXT: store i32
+
+ // Capture the bounds.
+ // CHECK-NEXT: [[T0:%.*]] = load i32* [[N]], align 4
+ // CHECK-NEXT: [[DIM0:%.*]] = zext i32 [[T0]] to i64
+ // CHECK-NEXT: [[T0:%.*]] = load i32* [[N]], align 4
+ // CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], 1
+ // CHECK-NEXT: [[DIM1:%.*]] = zext i32 [[T1]] to i64
+ typedef short array_t[n][n+1];
+
+ // CHECK-NEXT: [[T0:%.*]] = load i8** [[ARRAY]], align 8
+ // CHECK-NEXT: [[T1:%.*]] = bitcast i8* [[T0]] to i16*
+ // CHECK-NEXT: store i16* [[T1]], i16** [[REF]], align 8
+ array_t &ref = *(array_t*) array;
+
+ // CHECK-NEXT: [[T0:%.*]] = load i16** [[REF]]
+ // CHECK-NEXT: [[T1:%.*]] = mul i64 1, [[DIM1]]
+ // CHECK-NEXT: [[T2:%.*]] = getelementptr inbounds i16* [[T0]], i64 [[T1]]
+ // CHECK-NEXT: [[T3:%.*]] = getelementptr inbounds i16* [[T2]], i64 2
+ // CHECK-NEXT: store i16 3, i16* [[T3]]
+ ref[1][2] = 3;
+
+ // CHECK-NEXT: [[T0:%.*]] = load i16** [[REF]]
+ // CHECK-NEXT: [[T1:%.*]] = mul i64 4, [[DIM1]]
+ // CHECK-NEXT: [[T2:%.*]] = getelementptr inbounds i16* [[T0]], i64 [[T1]]
+ // CHECK-NEXT: [[T3:%.*]] = getelementptr inbounds i16* [[T2]], i64 5
+ // CHECK-NEXT: [[T4:%.*]] = load i16* [[T3]]
+ // CHECK-NEXT: store i16 [[T4]], i16* [[S]], align 2
+ short s = ref[4][5];
+
+ // CHECK-NEXT: ret void
+}
+