common.opt: Add Wstrict-overflow and Wstrict-overflow=.

./:	* common.opt: Add Wstrict-overflow and Wstrict-overflow=.
	* flags.h (warn_strict_overflow): Declare.
	(enum warn_strict_overflow_code): Define.
	(issue_strict_overflow_warning): New static inline function.
	* opts.c (warn_strict_overflow): New variable.
	(common_handle_option): Handle OPT_Wstrict_overflow and
	OPT_Wstrict_overflow_.
	* c-opts.c (c_common_handle_option): Set warn_strict_overflow for
	OPT_Wall.
	* fold-const.c: Include intl.h.
	(fold_deferring_overflow_warnings): New static variable.
	(fold_deferred_overflow_warning): New static variable.
	(fold_deferred_overflow_code): New static variable.
	(fold_defer_overflow_warnings): New function.
	(fold_undefer_overflow_warnings): New function.
	(fold_undefer_and_ignore_overflow_warnings): New function.
	(fold_deferring_overflow_warnings_p): New function.
	(fold_overflow_warning): New static function.
	(make_range): Add strict_overflow_p parameter.  Change all
	callers.
	(extract_muldiv, extract_muldiv_1): Likewise.
	(fold_unary) [ABS_EXPR]: Check ABS_EXPR before calling
	tree_expr_nonnegative_p.
	(fold_negate_expr): Call fold_overflow_warning.
	(fold_range_test): Likewise.
	(fold_comparison): Likewise.
	(fold_binary): Likewise.  Call tree_expr_nonnegative_warnv_p
	instead of tree_expr_nonnegative_p.
	(tree_expr_nonnegative_warnv_p): Rename from
	tree_expr_nonnegative_p, add strict_overflow_p parameter.
	(tree_expr_nonnegative_p): New function.
	(tree_expr_nonzero_warnv_p): Rename from tree_expr_nonzero_p, add
	strict_overflow_p parameter.
	(tree_expr_nonzero_p): New function.
	* passes.c (verify_interpass_invariants): New static function.
	(execute_one_pass): Call it.
	* tree-ssa-loop-niter.c (expand_simple_operations): Ignore fold
	warnings.
	(number_of_iterations_exit, loop_niter_by_eval): Likewise.
	(estimate_numbers_of_iterations): Likewise.
	(scev_probably_wraps_p): Likewise.
	* tree-ssa-ccp.c: Include "toplev.h".
	(evaluate_stmt): Defer fold overflow warnings until we know we are
	going to optimize.
	(struct fold_stmt_r_data): Add stmt field.
	(fold_stmt_r): Defer fold overflow warnings until we know we
	optimized.
	(fold_stmt): Initialize stmt field of fold_stmt_r_data.
	(fold_stmt_inplace): Likewise.
	* tree-cfgcleanup.c: Include "toplev.h" rather than "errors.h".
	(cleanup_control_expr_graph): Defer fold overflow warnings until
	we know we are going to optimize.
	* tree-cfg.c (fold_cond_expr_cond): Likewise.
	* tree-ssa-threadedge.c (simplify_control_stmt_condition):
	Likewise.
	* tree-vrp.c (vrp_expr_computes_nonnegative): Call
	tree_expr_nonnegative_warnv_p instead of tree_expr_nonnegative_p.
	* tree-ssa-loop-manip.c (create_iv): Likewise.
	* c-typeck.c (build_conditional_expr): Likewise.
	(build_binary_op): Likewise.
	* tree-vrp.c (vrp_expr_computes_nonzero): Call
	tree_expr_nonzero_warnv_p instead of tree_expr_nonzero_p.
	(extract_range_from_unary_expr): Likewise.
	* simplify-rtx.c (simplify_const_relational_operation): Warn when
	assuming that signed overflow does not occur.
	* c-common.c (pointer_int_sum): Ignore fold overflow warnings.
	* tree.h (tree_expr_nonnegative_warnv_p): Declare.
	(fold_defer_overflow_warnings): Declare.
	(fold_undefer_overflow_warnings): Declare.
	(fold_undefer_and_ignore_overflow_warnings): Declare.
	(fold_deferring_overflow_warnings_p): Declare.
	(tree_expr_nonzero_warnv_p): Declare.
	* doc/invoke.texi (Option Summary): Add -Wstrict-overflow to list
	of warning options.
	(Warning Options): Document -Wstrict-overflow.
	* Makefile.in (tree-ssa-threadedge.o): Depend on toplev.h.
	(tree-ssa-ccp.o): Likewise.
	(tree-cfgcleanup.o): Change errors.h dependency to toplev.h.
	(fold-const.o): Depend on intl.h.
testsuite/:
	* gcc.dg/Wstrict-overflow-1.c: New test.
	* gcc.dg/Wstrict-overflow-2.c: New test.
	* gcc.dg/Wstrict-overflow-3.c: New test.
	* gcc.dg/Wstrict-overflow-4.c: New test.
	* gcc.dg/Wstrict-overflow-5.c: New test.
	* gcc.dg/Wstrict-overflow-6.c: New test.
	* gcc.dg/Wstrict-overflow-7.c: New test.
	* gcc.dg/Wstrict-overflow-8.c: New test.
	* gcc.dg/Wstrict-overflow-9.c: New test.
	* gcc.dg/Wstrict-overflow-10.c: New test.

From-SVN: r121895

1 files changed, 18 insertions, 2 deletions

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index f8e613d..cb1c4f6 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -4086,7 +4086,15 @@ simplify_const_relational_operation (enum rtx_code code,
 	      tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
 						       : trueop0;
 	      if (GET_CODE (tem) == ABS)
-		return const0_rtx;
+		{
+		  if (INTEGRAL_MODE_P (mode)
+		      && (issue_strict_overflow_warning
+			  (WARN_STRICT_OVERFLOW_CONDITIONAL)))
+		    warning (OPT_Wstrict_overflow,
+			     ("assuming signed overflow does not occur when "
+			      "assuming abs (x) < 0 is false"));
+		  return const0_rtx;
+		}
 	    }
 
 	  /* Optimize popcount (x) < 0.  */
@@ -4104,7 +4112,15 @@ simplify_const_relational_operation (enum rtx_code code,
 	      tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
 						       : trueop0;
 	      if (GET_CODE (tem) == ABS)
-		return const_true_rtx;
+		{
+		  if (INTEGRAL_MODE_P (mode)
+		      && (issue_strict_overflow_warning
+			  (WARN_STRICT_OVERFLOW_CONDITIONAL)))
+		    warning (OPT_Wstrict_overflow,
+			     ("assuming signed overflow does not occur when "
+			      "assuming abs (x) >= 0 is true"));
+		  return const_true_rtx;
+		}
 	    }
 
 	  /* Optimize popcount (x) >= 0.  */