sfp-machine.h (FP_EX_INVALID, [...]): New constants.

        * config/i386/sfp-machine.h (FP_EX_INVALID, FP_EX_DENORM,
        FP_EXP_DIVZERO, FP_EX_OVERFLOW, FP_EX_UNDERFLOW, FP_EX_INEXACT):
        New constants.
        (struct fenv): New structure.
        (FP_HANDLE_EXCEPTIONS): New define.
        (FP_RND_NEAREST, FP_RND_ZERO, FP_RND_PINF, FP_RND_MINF): New constants.
        (_FP_DECL_EXP): New define.
        (FP_INIT_ROUNDMODE): New define.
        (FP_ROUNDMODE): New define.

From-SVN: r124857

gcc/ChangeLog

+2007-05-19  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/sfp-machine.h (FP_EX_INVALID, FP_EX_DENORM,
+	FP_EXP_DIVZERO, FP_EX_OVERFLOW, FP_EX_UNDERFLOW, FP_EX_INEXACT):
+	New constants.
+	(struct fenv): New structure.
+	(FP_HANDLE_EXCEPTIONS): New define.
+	(FP_RND_NEAREST, FP_RND_ZERO, FP_RND_PINF, FP_RND_MINF): New constants.
+	(_FP_DECL_EXP): New define.
+	(FP_INIT_ROUNDMODE): New define.
+	(FP_ROUNDMODE): New define.
+
 2007-05-19  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	* doc/invoke.texi (Warning Options): Add -Wconversion-sign.
@@ -13,13 +25,13 @@
 	(convert_and_check): Don't check warnings if the conversion failed.
 
 2007-05-19 Andy Hutchinson <HutchinsonAndy@netscape.net>
-           Anatoly Sokolov <aesok@dol.ru>
+	   Anatoly Sokolov <aesok@dol.ru>
 
 	* config/avr/avr-protos.h (expand_prologue, expand_epilogue, 
 	avr_epilogue_uses) : Add declaration.
 	* config/avr/predicates.md (avr_sp_immediate_operand): New predicate.
 	* config/avr/constraints.md (R): New constraint.
-	config/avr/avr.md (SREG_ADDR,  UNSPEC_SEI, UNSPEC_CLI, 
+	config/avr/avr.md (SREG_ADDR, UNSPEC_SEI, UNSPEC_CLI, 
 	UNSPECV_PROLOGUE_SAVES, UNSPECV_EPILOGUE_RESTORES): New constants.
 	(*pop1, *pop2, *pop3, *pop4, *pop5): Combine into ...
 	(*addhi3_sp_R_pc2, *addhi3_sp_R_pc3): ... these patterns.

gcc/config/i386/sfp-machine.h

@@ -44,6 +44,82 @@ typedef unsigned int UTItype __attribute__((mode(TI)));
     R##_c = FP_CLS_NAN;						\
   } while (0)
 
+#define FP_EX_INVALID		0x01
+#define FP_EX_DENORM		0x02
+#define FP_EX_DIVZERO		0x04
+#define FP_EX_OVERFLOW		0x08
+#define FP_EX_UNDERFLOW		0x10
+#define FP_EX_INEXACT		0x20
+
+struct fenv
+{
+  unsigned short int __control_word;
+  unsigned short int __unused1;
+  unsigned short int __status_word;
+  unsigned short int __unused2;
+  unsigned short int __tags;
+  unsigned short int __unused3;
+  unsigned int __eip;
+  unsigned short int __cs_selector;
+  unsigned int __opcode:11;
+  unsigned int __unused4:5;
+  unsigned int __data_offset;
+  unsigned short int __data_selector;
+  unsigned short int __unused5;
+};
+
+#define FP_HANDLE_EXCEPTIONS						\
+  do {									\
+    if (_fex & FP_EX_INVALID)						\
+      {									\
+	float f = 0.0;							\
+	__asm__ __volatile__ ("divss %0, %0 " : : "x" (f));		\
+      }									\
+    if (_fex & FP_EX_DIVZERO)						\
+      {									\
+	float f = 1.0, g = 0.0;						\
+	__asm__ __volatile__ ("divss %1, %0" : : "x" (f), "x" (g));	\
+      }									\
+    if (_fex & FP_EX_OVERFLOW)						\
+      {									\
+	struct fenv temp;						\
+	__asm__ __volatile__ ("fnstenv %0" : "=m" (temp));		\
+	temp.__status_word |= FP_EX_OVERFLOW;				\
+	__asm__ __volatile__ ("fldenv %0" : : "m" (temp));		\
+	__asm__ __volatile__ ("fwait");					\
+      }									\
+    if (_fex & FP_EX_UNDERFLOW)						\
+      {									\
+	struct fenv temp;						\
+	__asm__ __volatile__ ("fnstenv %0" : "=m" (temp));		\
+	temp.__status_word |= FP_EX_UNDERFLOW;				\
+	__asm__ __volatile__ ("fldenv %0" : : "m" (temp));		\
+	__asm__ __volatile__ ("fwait");					\
+      }									\
+    if (_fex & FP_EX_INEXACT)						\
+      {									\
+	struct fenv temp;						\
+	__asm__ __volatile__ ("fnstenv %0" : "=m" (temp));		\
+	temp.__status_word |= FP_EX_INEXACT;				\
+	__asm__ __volatile__ ("fldenv %0" : : "m" (temp));		\
+	__asm__ __volatile__ ("fwait");					\
+      }									\
+  } while (0)
+
+#define FP_RND_NEAREST		0
+#define FP_RND_ZERO		0xc00
+#define FP_RND_PINF		0x800
+#define FP_RND_MINF		0x400
+
+#define _FP_DECL_EX \
+  unsigned short _fcw __attribute__ ((unused)) = FP_RND_NEAREST
+
+#define FP_INIT_ROUNDMODE			\
+  do {						\
+    __asm__ ("fnstcw %0" : "=m" (_fcw));	\
+  } while (0)
+
+#define FP_ROUNDMODE		(_fcw & 0xc00)
 
 #define	__LITTLE_ENDIAN	1234
 #define	__BIG_ENDIAN	4321