gcc/ChangeLog:
2004-05-27  Paolo Bonzini  <bonzini@gnu.org>
	    Roger Sayle  <roger@eyesopen.com>

	PR rtl-optimization/15649
	Add LTGT_EXPR and improve pretty-printing of unordered
	comparisons.
	* c-common.c (c_common_truthvalue_conversion):
	Handle LTGT_EXPR.
	* c-typeck.c (build_binary_op): Likewise.
	* dojump.c (do_jump): Likewise.
	* expr.c (expand_expr_real_1, do_store_flag): Likewise.
	* predict.c (tree_predict_by_opcode): Likewise.
	* real.c (real_compare): Likewise.
	* tree-cfg.c (verify_expr): Likewise.
	* tree-inline.c (estimate_num_insns_1): Likewise.
	* tree-pretty-print.c (dump_generic_node): Likewise.
	Handle ORDERED_EXPR, UNORDERED_EXPR.
	(op_symbol): Print unordered comparisons differently
	than ordered ones.
	* tree.def (LTGT_EXPR): New '<' tree code.
	* doc/c-tree.texi (Expressions): Document floating-point
	comparison nodes.

	Fold comparisons between floating point values.
	* fold-const.c (enum comparison_code): New, from
	#define'd constants.  Define compcodes for unordered
	comparisons and for invalid transformations.
	(invert_tree_comparison): Add "honor_nans" parameter.
	(fold_truthop): Revamp to work on floating-point types too.
	(comparison_to_compcode): Support unordered comparisons.
	Use new enum comparison_code.
	(compcode_to_comparison): Likewise.
	(combine_compcodes): New function.
	(invert_truthvalue): Let invert_tree_comparison decide
	whether it is valid to fold the comparison.  Fold ORDERED
	and UNORDERED even if flag_unsafe_math_optimizations is off,
	and the remaining even if flag_unsafe_math_optimizations
	is off but we are under -fno-trapping-math.
	(fold_relational_const): Integer modes do not honor NaNs.

gcc/testsuite/ChangeLog:
2004-05-27  Paolo Bonzini  <bonzini@gnu.org>

	* gcc.c-torture/compare-fp-1.c, gcc.c-torture/compare-fp-2.c,
	gcc.c-torture/compare-fp-3.c, gcc.c-torture/compare-fp-4.c,
	gcc.c-torture/compare-fp-3.x, gcc.c-torture/compare-fp-4.x,
	gcc.c-torture/pr15649-1.c: New.

Co-Authored-By: Roger Sayle <roger@eyesopen.com>

From-SVN: r82365