re PR middle-end/71732 (FAIL: gcc.dg/torture/pr71532.c at -O2 and above)

	PR middle-end/71732
	* cselib.c (cselib_process_insn): Invalidate argument slots for
	const/pure calls.

From-SVN: r238727

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 303e4f5..97a9ab0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-07-25  John David Anglin  <danglin@gcc.gnu.org>
+
+       PR middle-end/71732
+       * cselib.c (cselib_process_insn): Invalidate argument slots for
+       const/pure calls.
+
 2016-07-25  Jiong Wang  <jiong.wang@arm.com>
 
        * config/aarch64/arm_neon.h (vfmah_lane_f16, vfmah_laneq_f16,

diff --git a/gcc/cselib.c b/gcc/cselib.c
index 14c7b32..0c5183c 100644 (file)
--- a/gcc/cselib.c
+++ b/gcc/cselib.c
@@ -2659,6 +2659,13 @@ cselib_process_insn (rtx_insn *insn)
       if (RTL_LOOPING_CONST_OR_PURE_CALL_P (insn)
          || !(RTL_CONST_OR_PURE_CALL_P (insn)))
        cselib_invalidate_mem (callmem);
+      else
+       /* For const/pure calls, invalidate any argument slots because
+          they are owned by the callee.  */
+       for (x = CALL_INSN_FUNCTION_USAGE (insn); x; x = XEXP (x, 1))
+         if (GET_CODE (XEXP (x, 0)) == USE
+             && MEM_P (XEXP (XEXP (x, 0), 0)))
+           cselib_invalidate_mem (XEXP (XEXP (x, 0), 0));
     }
 
   cselib_record_sets (insn);