2015-01-22 Richard Biener <rguenther@suse.de>

	* ipa-inline.c (can_inline_edge_p): Disable inlining of edges
	with IL incompatible options.  Properly honor user optimize
	attributes.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@219989 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 49 insertions, 10 deletions

diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index c0ff329ef09..da1afc69047 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -404,17 +404,56 @@ can_inline_edge_p (struct cgraph_edge *e, bool report,
      optimization attribute.  */
   else if (caller_tree != callee_tree)
     {
-      /* gcc.dg/pr43564.c.  Look at forced inline even in -O0.  */
-      if (DECL_DISREGARD_INLINE_LIMITS (callee->decl))
+      /* There are some options that change IL semantics which means
+         we cannot inline in these cases for correctness reason.
+	 Not even for always_inline declared functions.  */
+      /* Strictly speaking only when the callee contains signed integer
+         math where overflow is undefined.  */
+      if ((opt_for_fn (e->caller->decl, flag_strict_overflow)
+	   != opt_for_fn (e->caller->decl, flag_strict_overflow))
+	  || (opt_for_fn (e->caller->decl, flag_wrapv)
+	      != opt_for_fn (e->caller->decl, flag_wrapv))
+	  || (opt_for_fn (e->caller->decl, flag_trapv)
+	      != opt_for_fn (e->caller->decl, flag_trapv))
+	  /* Strictly speaking only when the callee contains memory
+	     accesses that are not using alias-set zero anyway.  */
+	  || (opt_for_fn (e->caller->decl, flag_strict_aliasing)
+	      != opt_for_fn (e->caller->decl, flag_strict_aliasing))
+	  /* Strictly speaking only when the callee uses FP math.  */
+	  || (opt_for_fn (e->caller->decl, flag_rounding_math)
+	      != opt_for_fn (e->caller->decl, flag_rounding_math))
+	  || (opt_for_fn (e->caller->decl, flag_trapping_math)
+	      != opt_for_fn (e->caller->decl, flag_trapping_math))
+	  || (opt_for_fn (e->caller->decl, flag_unsafe_math_optimizations)
+	      != opt_for_fn (e->caller->decl, flag_unsafe_math_optimizations))
+	  || (opt_for_fn (e->caller->decl, flag_finite_math_only)
+	      != opt_for_fn (e->caller->decl, flag_finite_math_only))
+	  || (opt_for_fn (e->caller->decl, flag_signaling_nans)
+	      != opt_for_fn (e->caller->decl, flag_signaling_nans))
+	  || (opt_for_fn (e->caller->decl, flag_cx_limited_range)
+	      != opt_for_fn (e->caller->decl, flag_cx_limited_range))
+	  || (opt_for_fn (e->caller->decl, flag_signed_zeros)
+	      != opt_for_fn (e->caller->decl, flag_signed_zeros))
+	  || (opt_for_fn (e->caller->decl, flag_associative_math)
+	      != opt_for_fn (e->caller->decl, flag_associative_math))
+	  || (opt_for_fn (e->caller->decl, flag_reciprocal_math)
+	      != opt_for_fn (e->caller->decl, flag_reciprocal_math))
+	  /* Strictly speaking only when the callee contains function
+	     calls that may end up setting errno.  */
+	  || (opt_for_fn (e->caller->decl, flag_errno_math)
+	      != opt_for_fn (e->caller->decl, flag_errno_math)))
+	{
+	  e->inline_failed = CIF_OPTIMIZATION_MISMATCH;
+	  inlinable = false;
+	}
+      /* gcc.dg/pr43564.c.  Apply user-forced inline even at -O0.  */
+      else if (DECL_DISREGARD_INLINE_LIMITS (callee->decl)
+	       && lookup_attribute ("always_inline",
+				    DECL_ATTRIBUTES (callee->decl)))
 	;
-      /* When user added an attribute, honnor it.  */
-      else if ((lookup_attribute ("optimize", DECL_ATTRIBUTES (caller->decl))
-		|| lookup_attribute ("optimize",
-				     DECL_ATTRIBUTES (callee->decl)))
-	       && ((opt_for_fn (caller->decl, optimize)
-		   > opt_for_fn (callee->decl, optimize))
-		   || (opt_for_fn (caller->decl, optimize_size)
-		       != opt_for_fn (callee->decl, optimize_size))))
+      /* When user added an attribute to the callee honor it.  */
+      else if (lookup_attribute ("optimize", DECL_ATTRIBUTES (callee->decl))
+	       && opts_for_fn (caller->decl) != opts_for_fn (callee->decl))
 	{
 	  e->inline_failed = CIF_OPTIMIZATION_MISMATCH;
 	  inlinable = false;