diff mbox series

[v1,3/4] Add tests for C++ musttail attribute

Message ID 20240124110800.3154093-3-ak@linux.intel.com
State New
Headers show
Series [v1,1/4] Improve must tail in RTL backend | expand

Commit Message

Andi Kleen Jan. 24, 2024, 11:07 a.m. UTC 
Mostly adopted from the existing C musttail plugin tests.
---
 gcc/testsuite/g++.dg/musttail1.C | 15 ++++++++++++
 gcc/testsuite/g++.dg/musttail2.C | 35 ++++++++++++++++++++++++++
 gcc/testsuite/g++.dg/musttail3.C | 42 ++++++++++++++++++++++++++++++++
 gcc/testsuite/g++.dg/musttail4.C | 19 +++++++++++++++
 4 files changed, 111 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/musttail1.C
 create mode 100644 gcc/testsuite/g++.dg/musttail2.C
 create mode 100644 gcc/testsuite/g++.dg/musttail3.C
 create mode 100644 gcc/testsuite/g++.dg/musttail4.C
diff mbox series

Patch

diff --git a/gcc/testsuite/g++.dg/musttail1.C b/gcc/testsuite/g++.dg/musttail1.C
new file mode 100644
index 000000000000..c9276e0ae86a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/musttail1.C
@@ -0,0 +1,15 @@ 
+/* { dg-do compile { target tail_call } } */
+/* { dg-options "-std=c++11 -O2" } */
+/* { dg-options "-fdelayed-branch" { target sparc*-*-* } } */
+
+int __attribute__((noinline,noclone))
+callee (int i)
+{
+  return i * i;
+}
+
+int __attribute__((noinline,noclone))
+caller (int i)
+{
+  [[gnu::musttail]] return callee (i + 1);
+}
diff --git a/gcc/testsuite/g++.dg/musttail2.C b/gcc/testsuite/g++.dg/musttail2.C
new file mode 100644
index 000000000000..d9151d25f517
--- /dev/null
+++ b/gcc/testsuite/g++.dg/musttail2.C
@@ -0,0 +1,35 @@ 
+/* { dg-do compile { target tail_call } } */
+/* { dg-options "-std=c++11" } */
+
+struct box { char field[256]; int i; };
+
+int __attribute__((noinline,noclone))
+test_2_callee (int i, struct box b)
+{
+  if (b.field[0])
+    return 5;
+  return i * i;
+}
+
+int __attribute__((noinline,noclone))
+test_2_caller (int i)
+{
+  struct box b;
+  [[gnu::musttail]] return test_2_callee (i + 1, b); /* { dg-error "cannot tail-call: " } */
+}
+
+extern void setjmp (void);
+void
+test_3 (void)
+{
+  [[gnu::musttail]] return setjmp (); /* { dg-error "cannot tail-call: " } */
+}
+
+typedef void (fn_ptr_t) (void);
+volatile fn_ptr_t fn_ptr;
+
+void
+test_5 (void)
+{
+  [[gnu::musttail]] return fn_ptr (); /* { dg-error "cannot tail-call: " } */
+}
diff --git a/gcc/testsuite/g++.dg/musttail3.C b/gcc/testsuite/g++.dg/musttail3.C
new file mode 100644
index 000000000000..7d55f44124ee
--- /dev/null
+++ b/gcc/testsuite/g++.dg/musttail3.C
@@ -0,0 +1,42 @@ 
+/* { dg-do compile { target tail_call } } */
+/* { dg-options "-std=c++11" } */
+
+extern int foo2 (int x, ...);
+
+struct str
+{
+  int a, b;
+};
+
+str
+cstruct (int x)
+{
+  if (x < 10)
+    [[clang::musttail]] return cstruct (x + 1);
+  return { x, 0 };
+}
+
+int
+cstruct2 (int x, str & ref)
+{
+  if (x < 10)
+    {
+      str r = { };
+      [[clang::musttail]] return cstruct2 (x + 1, r);
+    }
+  return x + 1;
+}
+
+
+int
+foo (int x)
+{
+  if (x < 10)
+    [[clang::musttail]] return foo2 (x, 29);
+  if (x < 100)
+    {
+      int k = foo (x + 1);
+      [[clang::musttail]] return k;	/* { dg-error "cannot tail-call: " } */
+    }
+  return x;
+}
diff --git a/gcc/testsuite/g++.dg/musttail4.C b/gcc/testsuite/g++.dg/musttail4.C
new file mode 100644
index 000000000000..3122acfb1719
--- /dev/null
+++ b/gcc/testsuite/g++.dg/musttail4.C
@@ -0,0 +1,19 @@ 
+/* { dg-do compile { target tail_call } } */
+/* Allow nested functions.  */
+/* { dg-options "-Wno-pedantic -std=c++11" } */
+
+struct box { char field[64]; int i; };
+
+struct box __attribute__((noinline,noclone))
+returns_struct (int i)
+{
+  struct box b;
+  b.i = i * i;
+  return b;
+}
+
+int __attribute__((noinline,noclone))
+test_1 (int i)
+{
+  [[gnu::musttail]] return returns_struct (i * 5).i; /* { dg-error "return value must be a call" } */
+}