re PR rtl-optimization/79541 (lra reads uninitialized memory (with invalid input))

2017-02-17  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/79541
	* lra-constraints.c (curr_insn_transform): Remove wrong asm insn
	instead of transforming it into USE.

From-SVN: r245536

gcc/ChangeLog

+2017-02-17  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/79541
+	* lra-constraints.c (curr_insn_transform): Remove wrong asm insn
+	instead of transforming it into USE.
+
 2017-02-17  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* config/rs6000/rs6000.md (extendsfdf2): Remove default arguments.

gcc/lra-constraints.c

@@ -3773,9 +3773,9 @@ curr_insn_transform (bool check_only_p)
 	fatal_insn ("unable to generate reloads for:", curr_insn);
       error_for_asm (curr_insn,
 		     "inconsistent operand constraints in an %<asm%>");
-      /* Avoid further trouble with this insn.	*/
-      PATTERN (curr_insn) = gen_rtx_USE (VOIDmode, const0_rtx);
-      lra_invalidate_insn_data (curr_insn);
+      /* Avoid further trouble with this insn.  Don't generate use
+	 pattern here as we could use the insn SP offset.  */
+      lra_set_insn_deleted (curr_insn);
       return true;
     }