i386: Skip DF_REF_INSN if DF_REF_INSN_INFO is false

We should check DF_REF_INSN_INFO before accessing DF_REF_INSN.

gcc/

	PR target/82673
	* config/i386/i386.c (ix86_finalize_stack_frame_flags): Skip
	DF_REF_INSN if DF_REF_INSN_INFO is false.

gcc/testsuite/

	PR target/82673
	* gcc.target/i386/pr82673.c: New test.

From-SVN: r254013

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index be73972..ab759ab 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR target/82673
+       * config/i386/i386.c (ix86_finalize_stack_frame_flags): Skip
+       DF_REF_INSN if DF_REF_INSN_INFO is false.
+
 2017-10-23  Jan Hubicka  <hubicka@ucw.cz>
 
        * i386.c (dimode_scalar_chain::compute_convert_gain): Use

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index b182cc6..3fafcfe 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -12692,10 +12692,13 @@ ix86_finalize_stack_frame_flags (void)
              for (ref = DF_REG_USE_CHAIN (HARD_FRAME_POINTER_REGNUM);
                   ref; ref = next)
                {
-                 rtx_insn *insn = DF_REF_INSN (ref);
+                 next = DF_REF_NEXT_REG (ref);
+                 if (!DF_REF_INSN_INFO (ref))
+                   continue;
+
                  /* Make sure the next ref is for a different instruction,
                     so that we're not affected by the rescan.  */
-                 next = DF_REF_NEXT_REG (ref);
+                 rtx_insn *insn = DF_REF_INSN (ref);
                  while (next && DF_REF_INSN (next) == insn)
                    next = DF_REF_NEXT_REG (next);
 

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3aadb9e..f4c0948 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-23  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR target/82673
+       * gcc.target/i386/pr82673.c: New test.
+
 2017-10-23  Jakub Jelinek  <jakub@redhat.com>
 
        * lib/scanasm.exp (dg-function-on-line): Accept optional column info.

diff --git a/gcc/testsuite/gcc.target/i386/pr82673.c b/gcc/testsuite/gcc.target/i386/pr82673.c
new file mode 100644 (file)
index 0000000..50eb5a3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr82673.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O0 -fno-omit-frame-pointer -fvar-tracking-assignments" } */
+
+register long *B asm ("ebp");
+
+long y = 20;
+
+void
+bar (void) /* { dg-error "frame pointer required, but reserved" } */
+{
+  B = &y;
+} /* { dg-error "bp cannot be used in asm here" } */