Merge branch 'master' of ssh://bitbucket.org/czan/honours

1 files changed, 56 insertions, 0 deletions

diff --git a/clang/test/CodeGen/parameter-passing.c b/clang/test/CodeGen/parameter-passing.c
new file mode 100644
index 0000000..e48815b
--- /dev/null
+++ b/clang/test/CodeGen/parameter-passing.c
@@ -0,0 +1,56 @@
+// Check the various ways in which the three classes of values
+// (scalar, complex, aggregate) interact with parameter passing
+// (function entry, function return, call argument, call result).
+//
+// We also check _Bool and empty structures, as these can have annoying
+// corner cases.
+
+// RUN: %clang_cc1 %s -triple i386-unknown-unknown -O3 -emit-llvm -o %t
+// RUN: not grep '@g0' %t
+
+// RUN: %clang_cc1 %s -triple x86_64-unknown-unknown -O3 -emit-llvm -o %t
+// RUN: not grep '@g0' %t
+
+// RUN: %clang_cc1 %s -triple powerpc-unknown-unknown -O3 -emit-llvm -o %t
+// RUN: not grep '@g0' %t
+
+typedef _Bool BoolTy;
+typedef int ScalarTy;
+typedef _Complex int ComplexTy;
+typedef struct { int a, b, c; } AggrTy;
+typedef struct { int a[0]; } EmptyTy;
+
+static int result;
+
+static BoolTy bool_id(BoolTy a) { return a; }
+static AggrTy aggr_id(AggrTy a) { return a; }
+static EmptyTy empty_id(EmptyTy a) { return a; }
+static ScalarTy scalar_id(ScalarTy a) { return a; }
+static ComplexTy complex_id(ComplexTy a) { return a; }
+
+static void bool_mul(BoolTy a) { result *= a; }
+
+static void aggr_mul(AggrTy a) { result *= a.a * a.b * a.c; }
+
+static void empty_mul(EmptyTy a) { result *= 53; }
+
+static void scalar_mul(ScalarTy a) { result *= a; }
+
+static void complex_mul(ComplexTy a) { result *= __real a * __imag a; }
+
+extern void g0(void);
+
+void f0(void) {
+  result = 1;
+  
+  bool_mul(bool_id(1));
+  aggr_mul(aggr_id((AggrTy) { 2, 3, 5}));
+  empty_mul(empty_id((EmptyTy) {}));
+  scalar_mul(scalar_id(7));
+  complex_mul(complex_id(11 + 13i));
+  
+  // This call should be eliminated.
+  if (result != 2 * 3 * 5 * 7 * 11 * 13 * 53)
+    g0();
+}
+