x86: Check interrupt instead of noreturn attribute

ix86_set_func_type checks noreturn attribute to avoid incompatible
attribute error in LTO1 on interrupt functions.  Since TREE_THIS_VOLATILE
is set also for _Noreturn without noreturn attribute, check interrupt
attribute for interrupt functions instead.

gcc/

	PR target/114097
	* config/i386/i386-options.cc (ix86_set_func_type): Check
	interrupt instead of noreturn attribute.

gcc/testsuite/

	PR target/114097
	* gcc.target/i386/pr114097-1.c: New test.

diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 93a01146db7be9d4b37b6137b07228d756de87f9..1301f6b913ed84c842d6946d64cd61d5f170b513 100644 (file)
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -3391,11 +3391,13 @@ ix86_set_func_type (tree fndecl)
      into a noreturn function by setting TREE_THIS_VOLATILE.  Normally
      the local-pure-const pass is run after ix86_set_func_type is called.
      When the local-pure-const pass is enabled for LTO, the interrupt
-     function is marked as noreturn in the IR output, which leads the
-     incompatible attribute error in LTO1.  */
+     function is marked with TREE_THIS_VOLATILE in the IR output, which
+     leads to the incompatible attribute error in LTO1.  Ignore the
+     interrupt function in this case.  */
   bool has_no_callee_saved_registers
     = ((TREE_THIS_VOLATILE (fndecl)
-       && lookup_attribute ("noreturn", DECL_ATTRIBUTES (fndecl))
+       && !lookup_attribute ("interrupt",
+                             TYPE_ATTRIBUTES (TREE_TYPE (fndecl)))
        && optimize
        && !optimize_debug
        && (TREE_NOTHROW (fndecl) || !flag_exceptions))

diff --git a/gcc/testsuite/gcc.target/i386/pr114097-1.c b/gcc/testsuite/gcc.target/i386/pr114097-1.c
new file mode 100644 (file)
index 0000000..b14c7b6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr114097-1.c
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mtune-ctrl=^prologue_using_move,^epilogue_using_move -fomit-frame-pointer" } */
+
+#define ARRAY_SIZE 256
+
+extern int array[ARRAY_SIZE][ARRAY_SIZE][ARRAY_SIZE];
+extern int value (int, int, int)
+#ifndef __x86_64__
+__attribute__ ((regparm(3)))
+#endif
+;
+
+void
+_Noreturn
+no_return_to_caller (void)
+{
+  unsigned i, j, k;
+  for (i = ARRAY_SIZE; i > 0; --i)
+    for (j = ARRAY_SIZE; j > 0; --j)
+      for (k = ARRAY_SIZE; k > 0; --k)
+       array[i - 1][j - 1][k - 1] = value (i, j, k);
+  while (1);
+}
+
+/* { dg-final { scan-assembler-not "push" } } */
+/* { dg-final { scan-assembler-not "pop" } } */