re PR middle-end/77925 (Add __builtin_issubnormal)

2017-06-08  Tamar Christina  <tamar.christina@arm.com>

	PR middle-end/77925
	PR middle-end/77926
	PR middle-end/66462

	* gcc/builtins.c (fold_builtin_fpclassify): Remove.
	(fold_builtin_interclass_mathfn): Remove.
	(expand_builtin): Add builtins to lowering list.
	(fold_builtin_n): Remove fold_builtin_varargs.
	(fold_builtin_varargs): Remove.
	* gcc/builtins.def (BUILT_IN_ISZERO, BUILT_IN_ISSUBNORMAL): New.
	* gcc/real.h (get_min_float): New.
	(real_format): Add is_ieee_compatible field.
	* gcc/real.c (get_min_float): New.
	(ieee_single_format): Set is_ieee_compatible flag.
	* gcc/gimple-low.c (lower_stm): Define BUILT_IN_FPCLASSIFY,
	CASE_FLT_FN (BUILT_IN_ISINF), BUILT_IN_ISINFD32, BUILT_IN_ISINFD64,
	BUILT_IN_ISINFD128, BUILT_IN_ISNAND32, BUILT_IN_ISNAND64,
	BUILT_IN_ISNAND128, BUILT_IN_ISNAN, BUILT_IN_ISNORMAL, BUILT_IN_ISZERO,
	BUILT_IN_ISSUBNORMAL, CASE_FLT_FN (BUILT_IN_FINITE), BUILT_IN_FINITED32
	BUILT_IN_FINITED64, BUILT_IN_FINITED128, BUILT_IN_ISFINITE.
	(lower_builtin_fpclassify, is_nan, is_normal, is_infinity): New.
	(is_zero, is_subnormal, is_finite, use_ieee_int_mode): Likewise.
	(lower_builtin_isnan, lower_builtin_isinfinite): Likewise.
	(lower_builtin_isnormal, lower_builtin_iszero): Likewise.
	(lower_builtin_issubnormal, lower_builtin_isfinite): Likewise.
	(emit_tree_cond, get_num_as_int, emit_tree_and_return_var): New.
	(mips_single_format): Likewise.
	(motorola_single_format): Likewise.
	(spu_single_format): Likewise.
	(ieee_double_format): Likewise.
	(mips_double_format): Likewise.
	(motorola_double_format): Likewise.
	(ieee_extended_motorola_format): Likewise.
	(ieee_extended_intel_128_format): Likewise.
	(ieee_extended_intel_96_round_53_format): Likewise.
	(ibm_extended_format): Likewise.
	(mips_extended_format): Likewise.
	(ieee_quad_format): Likewise.
	(mips_quad_format): Likewise.
	(vax_f_format): Likewise.
	(vax_d_format): Likewise.
	(vax_g_format): Likewise.
	(decimal_single_format): Likewise.
	(decimal_quad_format): Likewise.
	(iee_half_format): Likewise.
	(mips_single_format): Likewise.
	(arm_half_format): Likewise.
	(real_internal_format): Likewise.
	* gcc/doc/extend.texi: Add documentation for built-ins.
	* gcc/c/c-typeck.c (convert_arguments): Add BUILT_IN_ISZERO
	and BUILT_IN_ISSUBNORMAL.

gcc/testsuite/
2017-06-08  Tamar Christina  <tamar.christina@arm.com>

	* gcc.target/aarch64/builtin-fpclassify.c: New codegen test.
	* gcc.dg/fold-notunord.c: Removed.
	* gcc.dg/torture/floatn-tg-4.h: Add tests for iszero and issubnormal.
	* gcc.dg/torture/float128-tg-4.c: Likewise.
	* gcc.dg/torture/float128x-tg-4: Likewise.
	* gcc.dg/torture/float16-tg-4.c: Likewise.
	* gcc.dg/torture/float32-tg-4.c: Likewise.
	* gcc.dg/torture/float32x-tg-4.c: Likewise.
	* gcc.dg/torture/float64-tg-4.c: Likewise.
	* gcc.dg/torture/float64x-tg-4.c: Likewise.
	* gcc.dg/pr28796-1.c: Add -O2.
	* gcc.dg/builtins-43.c: Check lower instead of gimple.
	* gcc.dg/tg-tests.h: Add iszero and issubnormal.
	* gcc.dg/pr77925.c: Add to test safe cases.

From-SVN: r249005

1 files changed, 18 insertions, 0 deletions

diff --git a/gcc/real.h b/gcc/real.h
index e7248e30fa5..67fa7932e88 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -161,6 +161,19 @@ struct real_format
   bool has_signed_zero;
   bool qnan_msb_set;
   bool canonical_nan_lsbs_set;
+
+  /* This flag indicates whether the format is suitable for the optimized
+     code paths for the __builtin_fpclassify function and friends.  For
+     this, the format must be a base 2 representation with the sign bit as
+     the most-significant bit followed by (exp <= 32) exponent bits
+     followed by the mantissa bits.  It must be possible to interpret the
+     bits of the floating-point representation as an integer.  NaNs and
+     INFs (if available) must be represented by the same schema used by
+     IEEE 754.  (NaNs must be represented by an exponent with all bits 1,
+     any mantissa except all bits 0 and any sign bit.  +INF and -INF must be
+     represented by an exponent with all bits 1, a mantissa with all bits 0 and
+     a sign bit of 0 and 1 respectively.)  */
+  bool is_binary_ieee_compatible;
   const char *name;
 };
 
@@ -511,6 +524,11 @@ extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *);
    float string.  BUF must be large enough to contain the result.  */
 extern void get_max_float (const struct real_format *, char *, size_t);
 
+/* Write into BUF the smallest positive normalized number x,
+   such that b**(x-1) is normalized.  BUF must be large enough
+   to contain the result.  */
+extern void get_min_float (const struct real_format *, char *, size_t);
+
 #ifndef GENERATOR_FILE
 /* real related routines.  */
 extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int);