PR rtl-optimization/48542

	* reload.c (find_equiv_reg): Stop looking when finding a
	setjmp-type call.
	* reload1.c (reload_as_needed): Invalidate all reload
	registers when crossing a setjmp-type call.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@175132 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 0 deletions

diff --git a/gcc/reload1.c b/gcc/reload1.c
index e65503b9fa5..a87e6ad08d6 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -4844,6 +4844,13 @@ reload_as_needed (int live_known)
 	{
 	  AND_COMPL_HARD_REG_SET (reg_reloaded_valid, call_used_reg_set);
 	  AND_COMPL_HARD_REG_SET (reg_reloaded_valid, reg_reloaded_call_part_clobbered);
+
+	  /* If this is a call to a setjmp-type function, we must not
+	     reuse any reload reg contents across the call; that will
+	     just be clobbered by other uses of the register in later
+	     code, before the longjmp.  */
+	  if (find_reg_note (insn, REG_SETJMP, NULL_RTX))
+	    CLEAR_HARD_REG_SET (reg_reloaded_valid);
 	}
     }