diff mbox

[3/9] dce: Don't dead-code delete separately wrapped restores

Message ID 10b9d66d41effc38e8292db8ffd5bd1fbcc65b5e.1465347472.git.segher@kernel.crashing.org
State New
Headers show

Commit Message

Segher Boessenkool June 8, 2016, 1:47 a.m. UTC 
Deleting restores (before a noreturn) that are dead confuses dwarf2cfi.


2016-06-07  Segher Boessenkool  <segher@kernel.crashing.org>

	* dce.c (delete_unmarked_insns): Don't delete instructions with
	a REG_CFA_RESTORE note.

---
 gcc/dce.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox

Patch

diff --git a/gcc/dce.c b/gcc/dce.c
index ea3fb00..d510287 100644
--- a/gcc/dce.c
+++ b/gcc/dce.c
@@ -587,6 +587,15 @@  delete_unmarked_insns (void)
 	  if (!dbg_cnt (dce))
 	    continue;
 
+	  if (crtl->shrink_wrapped_separate
+	      && find_reg_note (insn, REG_CFA_RESTORE, NULL))
+	    {
+	      if (dump_file)
+		fprintf (dump_file, "DCE: NOT deleting insn %d, it's a "
+				    "callee-save restore\n", INSN_UID (insn));
+	      continue;
+	    }
+
 	  if (dump_file)
 	    fprintf (dump_file, "DCE: Deleting insn %d\n", INSN_UID (insn));