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.

diff --git a/ports/ChangeLog.tile b/ports/ChangeLog.tile
index e5a92fc42647237a04647ac51fe7a9ecf0b4b228..079b35c1db3f91ade072cc6419f585878d8065c8 100644 (file)
--- a/ports/ChangeLog.tile
+++ b/ports/ChangeLog.tile
@@ -1,3 +1,9 @@
+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.
+
 2013-07-04  Andreas Jaeger  <aj@suse.de>
 
        * sysdeps/unix/sysv/linux/tile/sys/ptrace.h (PTRACE_PEEKSIGINFO):

diff --git a/ports/sysdeps/tile/s_fma.c b/ports/sysdeps/tile/s_fma.c
index c84a9bb2dfa069cca230de2ec3bb33e3a16d0df7..d9613fa67ceff0e2f029d92be56381dc4b155177 100644 (file)
--- 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 84e9adc41abe124e3c1d8b04b7e1d05cee7bdf80..aa5c9b2d913647ddedac55b274d401f030d5597b 100644 (file)
--- 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 (file)
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)