1 files changed, 50 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/s390/htm-nofloat-1.c b/gcc/testsuite/gcc.target/s390/htm-nofloat-1.c
new file mode 100644
index 0000000000..6022efb97f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/s390/htm-nofloat-1.c
@@ -0,0 +1,50 @@
+/* { dg-do run } */
+/* { dg-require-effective-target htm } */
+/* { dg-options "-O3 -march=zEC12 -mzarch --save-temps" } */
+
+/* __builtin_tbegin has to emit clobbers for all FPRs since the tbegin
+   instruction does not automatically preserves them.  If the
+   transaction body is fully contained in a function the backend tries
+   after reload to get rid of the FPR save/restore operations
+   triggered by the clobbers.  This testcase failed since the backend
+   was able to get rid of all FPR saves/restores and since these were
+   the only stack operations also of the entire stack space.  So even
+   the save/restore of the stack pointer was omitted in the end.
+   However, since the frame layout has been fixed before, the prologue
+   still generated the stack pointer decrement making foo return with
+   a modified stack pointer.  */
+
+void abort(void);
+
+void __attribute__((noinline))
+foo (int a)
+{
+  if (__builtin_tbegin (0) == 0)
+    __builtin_tend ();
+}
+
+#ifdef __s390x__
+#define GET_STACK_POINTER(SP)			\
+  asm volatile ("stg %%r15, %0" : "=QRST" (SP));
+#else
+#define GET_STACK_POINTER(SP)			\
+  asm volatile ("st %%r15, %0" : "=QR" (SP));
+#endif
+
+int main(void)
+{
+  unsigned long new_sp, old_sp;
+
+  GET_STACK_POINTER (old_sp);
+  foo(42);
+  GET_STACK_POINTER (new_sp);
+
+  if (old_sp != new_sp)
+    abort ();
+
+  return 0;
+}
+
+/* Make sure no FPR saves/restores are emitted.  */
+/* { dg-final { scan-assembler-not "\tstd\t" } } */
+/* { dg-final { scan-assembler-not "\tld\t" } } */