[gcc(refs/users/marxin/heads/marxin-gcc-benchmark-branch)] rs6000: mark clobber for registers changed by untpyed_call

[Martin Liska]

https://gcc.gnu.org/g:a8532e9927ad6e4bbedbb957b02ca413aedf9098

commit a8532e9927ad6e4bbedbb957b02ca413aedf9098
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Mon Feb 17 10:48:39 2020 +0800

    rs6000: mark clobber for registers changed by untpyed_call
    
    As PR93047 said, __builtin_apply/__builtin_return does not work well with
    -frename-registers.  This is caused by return register(e.g. r3) is used to
    rename another register, before return register is stored to stack.
    This patch fix this issue by emitting clobber for those egisters which
    maybe changed by untyped call.
    
    gcc/
    2020-02-17  Jiufu Guo  <guojiufu@linux.ibm.com>
    
            PR target/93047
            * config/rs6000/rs6000.md (untyped_call): Add emit_clobber.
    
    gcc/testsuite
    2020-02-17  Jiufu Guo  <guojiufu@linux.ibm.com>
    
            PR target/93047
            * gcc.dg/torture/stackalign/builtin-return-2.c: New test case.

Diff:
---
 gcc/ChangeLog                                      |  5 +++
 gcc/config/rs6000/rs6000.md                        |  4 +++
 gcc/testsuite/ChangeLog                            |  5 +++
 .../gcc.dg/torture/stackalign/builtin-return-2.c   | 40 ++++++++++++++++++++++
 4 files changed, 54 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c7a551b4896..5357acf060b 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2020-02-17  Jiufu Guo  <guojiufu@linux.ibm.com>
+
+	PR target/93047
+	* config/rs6000/rs6000.md (untyped_call): Add emit_clobber.
+
 2020-02-16  Uroš Bizjak  <ubizjak@gmail.com>
 
 	PR target/93743
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 3da7b1ed9c2..ad88b6783af 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -10870,6 +10870,10 @@
 
   emit_call_insn (gen_call (operands[0], const0_rtx, const0_rtx));
 
+  for (int i = 0; i < XVECLEN (operands[2], 0); i++)
+    emit_clobber (SET_SRC (XVECEXP (operands[2], 0, i)));
+  emit_insn (gen_blockage ());
+
   for (i = 0; i < XVECLEN (operands[2], 0); i++)
     {
       rtx set = XVECEXP (operands[2], 0, i);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f2566ad9844..83c581c4e0c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-02-17  Jiufu Guo  <guojiufu@linux.ibm.com>
+
+	PR target/93047
+	* gcc.dg/torture/stackalign/builtin-return-2.c: New test case.
+
 2020-02-16  Uroš Bizjak  <ubizjak@gmail.com>
 
 	PR target/93743
diff --git a/gcc/testsuite/gcc.dg/torture/stackalign/builtin-return-2.c b/gcc/testsuite/gcc.dg/torture/stackalign/builtin-return-2.c
new file mode 100644
index 00000000000..771910971d6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/stackalign/builtin-return-2.c
@@ -0,0 +1,40 @@
+/* PR target/93047 */
+/* Originator: Andrew Church <gcczilla@achurch.org> */
+/* { dg-do run } */
+/* { dg-additional-options "-O3 -frename-registers" } */
+/* { dg-require-effective-target untyped_assembly } */
+
+#ifdef __MMIX__
+/* No parameters on stack for bar.  */
+#define STACK_ARGUMENTS_SIZE 0
+#else
+#define STACK_ARGUMENTS_SIZE 64
+#endif
+
+extern void abort(void);
+
+int foo(int n)
+{
+  return n+1;
+}
+
+int bar(int n)
+{
+  __builtin_return(__builtin_apply((void (*)(void))foo, __builtin_apply_args(),
+				   STACK_ARGUMENTS_SIZE));
+}
+
+int main(void)
+{
+  /* Allocate 64 bytes on the stack to make sure that __builtin_apply
+     can read at least 64 bytes above the return address.  */
+  char dummy[64];
+
+  __asm__ ("" : : "" (dummy));
+
+  if (bar(1) != 2)
+    abort();
+
+  return 0;
+}
+