This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[patch] add softfp to sparc-*-linux*


I'm using a sparc leon processor, which is synthesizable without an fpu. I've
been using this patch which adds the ability to use the softfp soft-float 
implementation on sparc. The sfp-machine header is based on the rs6000 version.

I tested that -msoft-float will emit calls to the softfp functions and
actually works. Also tested that -mhard-float still emits actual floating point 
instructions.

Anyone interested in taking a look and committing this?


2009-04-14  Austin Foxley   <austinf@cetoncorp.com>

        * config.gcc (sparc-*-linux*) : Add softfp rules to sparc linux target
        * config/sparc/sfp-machine.h : softfp machine header, based on rs6000
        * config/sparc/t-fprules-softfp : softfp config rules for sparc

Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(revision 146056)
+++ gcc/config.gcc	(working copy)
@@ -2175,7 +2175,7 @@
 	else
 		tm_file="${tm_file} sparc/linux.h"
 	fi
-	tmake_file="${tmake_file} sparc/t-crtfm"
+ 	tmake_file="${tmake_file} sparc/t-crtfm sparc/t-fprules-softfp soft-fp/t-softfp"
 	;;
 sparc-*-rtems*)
 	tm_file="${tm_file} dbxelf.h elfos.h svr4.h sparc/sysv4.h sparc/sp-elf.h sparc/rtemself.h rtems.h newlib-stdint.h"
Index: gcc/config/sparc/sfp-machine.h
===================================================================
--- gcc/config/sparc/sfp-machine.h	(revision 0)
+++ gcc/config/sparc/sfp-machine.h	(revision 0)
@@ -0,0 +1,48 @@
+#define _FP_W_TYPE_SIZE		32
+#define _FP_W_TYPE		unsigned long
+#define _FP_WS_TYPE		signed long
+#define _FP_I_TYPE		long
+
+#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_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 << 1) - 1)
+#define _FP_NANFRAC_D		((_FP_QNANBIT_D << 1) - 1), -1
+#define _FP_NANFRAC_Q		((_FP_QNANBIT_Q << 1) - 1), -1, -1, -1
+#define _FP_NANSIGN_S		0
+#define _FP_NANSIGN_D		0
+#define _FP_NANSIGN_Q		0
+
+#define _FP_KEEPNANFRACP 1
+
+#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)
+
+#define __BYTE_ORDER __BIG_ENDIAN
+
+
+/* Define ALIASNAME as a strong alias for NAME.  */
+# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
+# define _strong_alias(name, aliasname) \
+  extern __typeof (name) aliasname __attribute__ ((alias (#name)));
Index: gcc/config/sparc/t-fprules-softfp
===================================================================
--- gcc/config/sparc/t-fprules-softfp	(revision 0)
+++ gcc/config/sparc/t-fprules-softfp	(revision 0)
@@ -0,0 +1,6 @@
+softfp_float_modes := sf df
+softfp_int_modes := si di
+softfp_extensions := sfdf
+softfp_truncations := dfsf
+softfp_machine_header := sparc/sfp-machine.h
+softfp_exclude_libgcc2 := y


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]