re PR rtl-optimization/42461 (missed optimization for pure functions)

	PR rtl-optimization/42461
	* dce.c (deletable_insn_p): Return true for const or pure calls again.
	* except.c (insn_could_throw_p): Return false if !flag_exceptions.

From-SVN: r160507

1 files changed, 8 insertions, 8 deletions

diff --git a/gcc/dce.c b/gcc/dce.c
index 38a5b30..ee18b58 100644
--- a/gcc/dce.c
+++ b/gcc/dce.c
@@ -94,14 +94,6 @@ deletable_insn_p (rtx insn, bool fast, bitmap arg_stores)
   rtx body, x;
   int i;
 
-  /* Don't delete jumps, notes and the like.  */
-  if (!NONJUMP_INSN_P (insn))
-    return false;
-
-  /* Don't delete insns that can throw.  */
-  if (!insn_nothrow_p (insn))
-    return false;
-
   if (CALL_P (insn)
       /* We cannot delete calls inside of the recursive dce because
 	 this may cause basic blocks to be deleted and this messes up
@@ -116,6 +108,14 @@ deletable_insn_p (rtx insn, bool fast, bitmap arg_stores)
 	  && !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn)))
     return find_call_stack_args (insn, false, fast, arg_stores);
 
+  /* Don't delete jumps, notes and the like.  */
+  if (!NONJUMP_INSN_P (insn))
+    return false;
+
+  /* Don't delete insns that can throw.  */
+  if (!insn_nothrow_p (insn))
+    return false;
+
   body = PATTERN (insn);
   switch (GET_CODE (body))
     {