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[PATCH] tile: use soft-fp for fma() and fmaf()

From: Chris Metcalf <cmetcalf at tilera dot com>
To: <libc-ports at sourceware dot org>
Date: Wed, 3 Jul 2013 11:23:01 -0400
Subject: [PATCH] tile: use soft-fp for fma() and fmaf()

The sfp-machine.h is based on the gcc version, but extended with
required new macros by comparison with other architectures and by
investigating the hardware support for FP on tile.
---
2013-07-03  Chris Metcalf  <cmetcalf@tilera.com>

	* sysdeps/tile/s_fma.c: Use soft-fp version instead of ieee754.
	* sysdeps/tile/s_fmaf.c: Likewise.
	* sysdeps/tile/sfp-machine.h: New file.

 ports/ChangeLog.tile             |    6 ++
 ports/sysdeps/tile/s_fma.c       |    5 +--
 ports/sysdeps/tile/s_fmaf.c      |    5 +--
 ports/sysdeps/tile/sfp-machine.h |   97 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 105 insertions(+), 8 deletions(-)
 create mode 100644 ports/sysdeps/tile/sfp-machine.h

diff --git a/ports/sysdeps/tile/s_fma.c b/ports/sysdeps/tile/s_fma.c
index c84a9bb..d9613fa 100644
--- a/ports/sysdeps/tile/s_fma.c
+++ b/ports/sysdeps/tile/s_fma.c
@@ -1,4 +1 @@
-/* tile does not support the rounding modes required by the ieee754/dbl-64
-   implementation, but it's still better than the generic implementation.  */
-
-#include <sysdeps/ieee754/dbl-64/s_fma.c>
+#include <soft-fp/fmadf4.c>
diff --git a/ports/sysdeps/tile/s_fmaf.c b/ports/sysdeps/tile/s_fmaf.c
index 84e9adc..aa5c9b2 100644
--- a/ports/sysdeps/tile/s_fmaf.c
+++ b/ports/sysdeps/tile/s_fmaf.c
@@ -1,4 +1 @@
-/* tile does not support the rounding modes required by the ieee754/dbl-64
-   implementation, but it's still better than the generic implementation.  */
-
-#include <sysdeps/ieee754/dbl-64/s_fmaf.c>
+#include <soft-fp/fmasf4.c>
diff --git a/ports/sysdeps/tile/sfp-machine.h b/ports/sysdeps/tile/sfp-machine.h
new file mode 100644
index 0000000..3ddc4b4
--- /dev/null
+++ b/ports/sysdeps/tile/sfp-machine.h
@@ -0,0 +1,97 @@
+/* Machine-dependent software floating-point definitions, tile version.
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <bits/wordsize.h>
+
+#define _FP_W_TYPE_SIZE		__WORDSIZE
+#define _FP_W_TYPE		unsigned long
+#define _FP_WS_TYPE		signed long
+#define _FP_I_TYPE		long
+
+#if _FP_W_TYPE_SIZE == 64
+
+#define _FP_MUL_MEAT_S(R,X,Y)					\
+  _FP_MUL_MEAT_1_imm(_FP_WFRACBITS_S,R,X,Y)
+#define _FP_MUL_MEAT_D(R,X,Y)					\
+  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_Q(R,X,Y)					\
+  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_MUL_MEAT_DW_S(R,X,Y)				\
+  _FP_MUL_MEAT_DW_1_imm(_FP_WFRACBITS_S,R,X,Y)
+#define _FP_MUL_MEAT_DW_D(R,X,Y)				\
+  _FP_MUL_MEAT_DW_1_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_DW_Q(R,X,Y)				\
+  _FP_MUL_MEAT_DW_2_wide_3mul(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_imm(S,R,X,Y,_FP_DIV_HELP_imm)
+#define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_1_udiv_norm(D,R,X,Y)
+#define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_2_udiv(Q,R,X,Y)
+
+#define _FP_NANFRAC_S		_FP_QNANBIT_S
+#define _FP_NANFRAC_D		_FP_QNANBIT_D
+#define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0
+
+#else  /* _FP_W_TYPE_SIZE == 32 */
+
+#define _FP_MUL_MEAT_S(R,X,Y)					\
+  _FP_MUL_MEAT_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_D(R,X,Y)					\
+  _FP_MUL_MEAT_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_Q(R,X,Y)					\
+  _FP_MUL_MEAT_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_MUL_MEAT_DW_S(R,X,Y)				\
+  _FP_MUL_MEAT_DW_1_wide(_FP_WFRACBITS_S,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_DW_D(R,X,Y)				\
+  _FP_MUL_MEAT_DW_2_wide(_FP_WFRACBITS_D,R,X,Y,umul_ppmm)
+#define _FP_MUL_MEAT_DW_Q(R,X,Y)				\
+  _FP_MUL_MEAT_DW_4_wide(_FP_WFRACBITS_Q,R,X,Y,umul_ppmm)
+
+#define _FP_DIV_MEAT_S(R,X,Y)	_FP_DIV_MEAT_1_loop(S,R,X,Y)
+#define _FP_DIV_MEAT_D(R,X,Y)	_FP_DIV_MEAT_2_udiv(D,R,X,Y)
+#define _FP_DIV_MEAT_Q(R,X,Y)	_FP_DIV_MEAT_4_udiv(Q,R,X,Y)
+
+#define _FP_NANFRAC_S		_FP_QNANBIT_S
+#define _FP_NANFRAC_D		_FP_QNANBIT_D, 0
+#define _FP_NANFRAC_Q		_FP_QNANBIT_Q, 0, 0, 0
+
+#endif
+
+#define _FP_NANSIGN_S		1
+#define _FP_NANSIGN_D		1
+#define _FP_NANSIGN_Q		1
+
+#define _FP_KEEPNANFRACP 1
+#define _FP_QNANNEGATEDP 0
+
+#define _FP_CHOOSENAN(fs, wc, R, X, Y, OP)			\
+  do {								\
+    if ((_FP_FRAC_HIGH_RAW_##fs(X) & _FP_QNANBIT_##fs)		\
+	&& !(_FP_FRAC_HIGH_RAW_##fs(Y) & _FP_QNANBIT_##fs))	\
+      {								\
+	R##_s = Y##_s;						\
+	_FP_FRAC_COPY_##wc(R,Y);				\
+      }								\
+    else							\
+      {								\
+	R##_s = X##_s;						\
+	_FP_FRAC_COPY_##wc(R,X);				\
+      }								\
+    R##_c = FP_CLS_NAN;						\
+  } while (0)
-- 
1.7.1

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