From eeef0e452e98fe6424ce65fb25fba15c59151848 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Sun, 28 Jan 2007 05:15:06 +0000
Subject: common.opt: Add fstrict-overflow.

./:	* common.opt: Add fstrict-overflow.
	* opts.c (decode_options): Set flag_strict_overflow if -O2.
	* flags.h (TYPE_OVERFLOW_WRAPS): Define.
	(TYPE_OVERFLOW_UNDEFINED): Define.
	(TYPE_OVERFLOW_TRAPS): Define.  This replaces TYPE_TRAP_SIGNED.
	Replace all uses.
	* tree.h (TYPE_TRAP_SIGNED): Don't define.
	* fold-const.c (negate_expr_p): Use TYPE_OVERFLOW_UNDEFINED.
	(fold_negate_expr): Likewise.
	(make_range): Likewise.
	(extract_muldiv_1): Likewise.
	(maybe_canonicalize_comparison): Likewise.
	(fold_comparison): Likewise.
	(fold_binary): Likewise.
	(tree_expr_nonnegative_p): Likewise.
	(tree_expr_nonzero_p): Likewise.
	* tree-vrp.c (compare_values): Likewise.
	(extract_range_from_binary_expr): Likewise.
	(extract_range_from_unary_expr): Likewise.
	* tree-ssa-loop-niter.c (infer_loop_bounds_from_signedness):
	Likewise.
	(nowrap_type_p): Likewise.
	* tree-scalar-evolution.c (simple_iv): Likewise.
	* fold-const.c (negate_expr_p): Use TYPE_OVERFLOW_WRAPS.
	(build_range_check): Likewise.
	(extract_muldiv_1): Likewise.
	(fold_comparison): Likewise.
	* tree-vrp.c (vrp_int_const_binop): Likewise.
	(extract_range_from_unary_expr): Likewise.
	* convert.c (convert_to_integer): Likewise.
	* fold-const.c (fold_negate_expr): Use TYPE_OVERFLOW_TRAPS.
	(fold_comparison): Likewise.
	(fold_binary): Likewise.
	* optabs.c (optab_for_tree_code): Likewise.
	* tree-vectorizer.c (vect_is_simple_reduction): Likewise.
	* simplify-rtx.c (simplify_const_relational_operation): Check
	flag_strict_overflow and flag_trapv.
	(simplify_const_relational_operation): Likewise.
	* doc/invoke.texi (Option Summary): Mention -fstrict-overflow.
	(Optimize Options): Add -fstrict-overflow to -O2 list.  Document
	-fstrict-overflow.
testsuite/:
	* gcc.dg/strict-overflow-1.c: New test.
	* gcc.dg/no-strict-overflow-1.c: New test.
	* gcc.dg/strict-overflow-2.c: New test.
	* gcc.dg/no-strict-overflow-2.c: New test.
	* gcc.dg/strict-overflow-3.c: New test.
	* gcc.dg/no-strict-overflow-3.c: New test.
	* gcc.dg/strict-overflow-4.c: New test.
	* gcc.dg/no-strict-overflow-4.c: New test.
	* gcc.dg/fold-mod-1.c: Add -fstrict-overflow option.
	* gcc.dg/pr15784-1.c: Likewise.
	* gcc.dg/pr20922-1.c: Likewise.
	* gcc.dg/pr20922-3.c: Likewise.
	* gcc.dg/pr20922-4.c: Likewise.
	* gcc.dg/pr20922-6.c: Likewise.
	* gcc.dg/compare-4.c: Likewise.
	* gcc.dg/torture/pr26898-1.c: Likewise.
	* gcc.dg/tree-ssa/divide-1.c: Likewise.
	* gcc.dg/tree-ssa/divide-2.c: Likewise.
	* gcc.dg/tree-ssa/divide-3.c: Likewise.
	* gcc.dg/tree-ssa/divide-4.c: Likewise.
	* gcc.dg/tree-ssa/pr14490-1.c: Likewise.
	* gcc.dg/tree-ssa/pr14490-3.c: Likewise.
	* gcc.dg/tree-ssa/pr21082.c: Likewise.
	* gcc.dg/tree-ssa/pr26899.c: Likewise.
	* g++.dg/tree-ssa/pr21082.C: Likewise.

From-SVN: r121254
---
 gcc/simplify-rtx.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'gcc/simplify-rtx.c')

diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 2199c63..0ce80c7 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -1,6 +1,7 @@
 /* RTL simplification functions for GNU compiler.
    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+   Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -3939,7 +3940,8 @@ simplify_const_relational_operation (enum rtx_code code,
 	  /* Optimize abs(x) < 0.0.  */
 	  if (trueop1 == CONST0_RTX (mode)
 	      && !HONOR_SNANS (mode)
-	      && !(flag_wrapv && INTEGRAL_MODE_P (mode)))
+	      && (!INTEGRAL_MODE_P (mode)
+		  || (!flag_wrapv && !flag_trapv && flag_strict_overflow)))
 	    {
 	      tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
 						       : trueop0;
@@ -3952,7 +3954,8 @@ simplify_const_relational_operation (enum rtx_code code,
 	  /* Optimize abs(x) >= 0.0.  */
 	  if (trueop1 == CONST0_RTX (mode)
 	      && !HONOR_NANS (mode)
-	      && !(flag_wrapv && INTEGRAL_MODE_P (mode)))
+	      && (!INTEGRAL_MODE_P (mode)
+		  || (!flag_wrapv && !flag_trapv && flag_strict_overflow)))
 	    {
 	      tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
 						       : trueop0;
-- 
cgit v1.1