Add -mno-toc; Support block moves if -mno-string.

From-SVN: r9763

gcc/config/rs6000/rs6000.c

@@ -202,6 +202,10 @@ rs6000_override_options ()
 	  warning ("-mstring is not supported on little endian systems");
 	}
     }
+
+#ifdef SUBTARGET_OVERRIDE_OPTIONS
+  SUBTARGET_OVERRIDE_OPTIONS;
+#endif
 }
 
 /* Create a CONST_DOUBLE like immed_double_const, except reverse the
@@ -641,37 +645,58 @@ input_operand (op, mode)
    operands[2] is the length
    operands[3] is the alignment */
 
+#define MAX_MOVE_REG 4
+
 int
 expand_block_move (operands)
      rtx operands[];
 {
   rtx bytes_rtx	= operands[2];
-  int constp	= (GET_CODE (bytes_rtx) == CONST_INT);
-  int bytes	= (constp ? INTVAL (bytes_rtx) : 0);
   rtx align_rtx = operands[3];
+  int constp	= (GET_CODE (bytes_rtx) == CONST_INT);
   int align	= XINT (align_rtx, 0);
+  int bytes;
+  int offset;
+  int num_reg;
+  int i;
   rtx src_reg;
   rtx dest_reg;
+  rtx src_addr;
+  rtx dest_addr;
   rtx tmp_reg;
+  rtx stores[MAX_MOVE_REG];
   int move_bytes;
 
+  /* If this is not a fixed size move, just call memcpy */
+  if (!constp)
+    return 0;
+
   /* Anything to move? */
-  if (constp && bytes <= 0)
+  bytes = INTVAL (bytes_rtx);
+  if (bytes <= 0)
     return 1;
 
-  /* If we don't want to use multiple string instructions, quit now and
-     generate the normal code.  */
-  if (!TARGET_STRING)
+  /* Don't support real large moves.  If string instructions are not used,
+     then don't generate more than 8 loads.  */
+  if (TARGET_STRING)
+    {
+      if (bytes > 64)
 	return 0;
-
-  /* We don't support variable sized moves at this time or real large moves */
-  if (!constp || bytes > 64)
+    }
+  else if (!STRICT_ALIGNMENT)
+    {
+      if (bytes > 4*8)
+	return 0;
+    }
+  else if (bytes > 8*align)
     return 0;
 
   /* Move the address into scratch registers.  */
   dest_reg = copy_addr_to_reg (XEXP (operands[0], 0));
   src_reg  = copy_addr_to_reg (XEXP (operands[1], 0));
 
+  if (TARGET_STRING)	/* string instructions are available */
+    {
       for ( ; bytes > 0; bytes -= move_bytes)
 	{
 	  if (bytes > 24		/* move up to 32 bytes at a time */
@@ -764,6 +789,62 @@ expand_block_move (operands)
 					    GEN_INT ((bytes > move_bytes) ? move_bytes : 0)));
 	    }
 	}
+    }
+
+  else			/* string instructions not available */
+    {
+      num_reg = offset = 0;
+      for ( ; bytes > 0; (bytes -= move_bytes), (offset += move_bytes))
+	{
+	  /* Calculate the correct offset for src/dest */
+	  if (offset == 0)
+	    {
+	      src_addr  = src_reg;
+	      dest_addr = dest_reg;
+	    }
+	  else
+	    {
+	      src_addr  = gen_rtx (PLUS, Pmode, src_reg,  GEN_INT (offset));
+	      dest_addr = gen_rtx (PLUS, Pmode, dest_reg, GEN_INT (offset));
+	    }
+
+	  /* Generate the appropriate load and store, saving the stores for later */
+	  if (bytes >= 4 && (align >= 4 || !STRICT_ALIGNMENT))
+	    {
+	      move_bytes = 4;
+	      tmp_reg = gen_reg_rtx (SImode);
+	      emit_insn (gen_movsi (tmp_reg, gen_rtx (MEM, SImode, src_addr)));
+	      stores[ num_reg++ ] = gen_movsi (gen_rtx (MEM, SImode, dest_addr), tmp_reg);
+	    }
+	  else if (bytes >= 2 && (align >= 2 || !STRICT_ALIGNMENT))
+	    {
+	      move_bytes = 2;
+	      tmp_reg = gen_reg_rtx (HImode);
+	      emit_insn (gen_movhi (tmp_reg, gen_rtx (MEM, HImode, src_addr)));
+	      stores[ num_reg++ ] = gen_movhi (gen_rtx (MEM, HImode, dest_addr), tmp_reg);
+	    }
+	  else
+	    {
+	      move_bytes = 1;
+	      tmp_reg = gen_reg_rtx (QImode);
+	      emit_insn (gen_movqi (tmp_reg, gen_rtx (MEM, QImode, src_addr)));
+	      stores[ num_reg++ ] = gen_movqi (gen_rtx (MEM, QImode, dest_addr), tmp_reg);
+	    }
+
+	  if (num_reg >= MAX_MOVE_REG)
+	    {
+	      for (i = 0; i < num_reg; i++)
+		emit_insn (stores[i]);
+	      num_reg = 0;
+	    }
+	}
+
+      if (num_reg > 0)
+	{
+	  for (i = 0; i < num_reg; i++)
+	    emit_insn (stores[i]);
+	}
+    }
 
   return 1;
 }
@@ -1936,6 +2017,16 @@ output_prolog (file, size)
 	  asm_fprintf (file, "\t{cax|add} 30,0,30\n");
 	  rs6000_pic_labelno++;
 	}
+      else if (TARGET_NO_TOC)
+	{
+	  ASM_GENERATE_INTERNAL_LABEL (buf, "LCTOC", 1);
+	  asm_fprintf (file, "\t{cau|addis} 30,0,");
+	  assemble_name (file, buf);
+	  asm_fprintf (file, "@ha\n");
+	  asm_fprintf (file, "\t{cal|addi} 30,30,");
+	  assemble_name (file, buf);
+	  asm_fprintf (file, "@l\n");
+	}
       else
 #endif /* USING_SVR4_H */
 	{

gcc/config/rs6000/rs6000.h

@@ -279,16 +279,7 @@ extern char *rs6000_cpu_string;
 
    On the RS/6000 this is used to define the target cpu type.  */
 
-#define OVERRIDE_OPTIONS \
-do {				\
-  rs6000_override_options ();	\
-  SUBTARGET_OVERRIDE_OPTIONS;	\
-} while (0)
-
-/* For OS-dependent options */
-#ifndef SUBTARGET_OVERRIDE_OPTIONS
-#define SUBTARGET_OVERRIDE_OPTIONS
-#endif
+#define OVERRIDE_OPTIONS rs6000_override_options ()
 
 /* Show we can debug even without a frame pointer.  */
 #define CAN_DEBUG_WITHOUT_FP

gcc/config/rs6000/sysv4.h

@@ -26,16 +26,19 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define MASK_RELOCATABLE	0x10000000	/* GOT pointers are PC relative */
 #define	MASK_NO_TRACEBACK	0x08000000	/* eliminate traceback words */
 #define MASK_LITTLE_ENDIAN	0x04000000	/* target is little endian */
+#define MASK_NO_TOC		0x02000000	/* do not use TOC for loading addresses */
 
 #define	TARGET_NO_BITFIELD_TYPE	(target_flags & MASK_NO_BITFIELD_TYPE)
 #define TARGET_STRICT_ALIGN	(target_flags & MASK_STRICT_ALIGN)
 #define TARGET_RELOCATABLE	(target_flags & MASK_RELOCATABLE)
 #define TARGET_NO_TRACEBACK	(target_flags & MASK_NO_TRACEBACK)
 #define TARGET_LITTLE_ENDIAN	(target_flags & MASK_LITTLE_ENDIAN)
+#define TARGET_NO_TOC		(target_flags & MASK_NO_TOC)
 
 #define	TARGET_BITFIELD_TYPE	(! TARGET_NO_BITFIELD_TYPE)
 #define	TARGET_TRACEBACK	(! TARGET_NO_TRACEBACK)
 #define TARGET_BIG_ENDIAN	(! TARGET_LITTLE_ENDIAN)
+#define TARGET_TOC		(! TARGET_NO_TOC)
 
 #undef	SUBTARGET_SWITCHES
 #define SUBTARGET_SWITCHES						\
@@ -50,7 +53,39 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
   { "little-endian",	 MASK_LITTLE_ENDIAN },				\
   { "little",		 MASK_LITTLE_ENDIAN },				\
   { "big-endian",	-MASK_LITTLE_ENDIAN },				\
-  { "big",		-MASK_LITTLE_ENDIAN },
+  { "big",		-MASK_LITTLE_ENDIAN },				\
+  { "no-toc",		 MASK_NO_TOC | MASK_MINIMAL_TOC },		\
+  { "toc",		-MASK_NO_TOC },
+
+/* Sometimes certain combinations of command options do not make sense
+   on a particular target machine.  You can define a macro
+   `OVERRIDE_OPTIONS' to take account of this.  This macro, if
+   defined, is executed once just after all the command options have
+   been parsed.
+
+   The macro SUBTARGET_OVERRIDE_OPTIONS is provided for subtargets, to
+   get control.  */
+
+#define SUBTARGET_OVERRIDE_OPTIONS					\
+do {									\
+  if (TARGET_RELOCATABLE && TARGET_NO_TOC)				\
+    {									\
+      target_flags &= ~ MASK_NO_TOC;					\
+      error ("-mrelocatable and -mno-toc are incompatible.");		\
+    }									\
+									\
+  if (TARGET_RELOCATABLE && !TARGET_MINIMAL_TOC)			\
+    {									\
+      target_flags |= MASK_MINIMAL_TOC;					\
+      error ("-mrelocatable and -mno-minimal-toc are incompatible.");	\
+    }									\
+									\
+  if (TARGET_NO_TOC && !TARGET_MINIMAL_TOC)				\
+    {									\
+      target_flags |= MASK_MINIMAL_TOC;					\
+      error ("-mno-toc and -mno-minimal-toc are incompatible.");	\
+    }									\
+} while (0)
 
 #include "rs6000/powerpc.h"
 
@@ -152,12 +187,12 @@ toc_section ()								\
     {									\
       if (! toc_initialized)						\
 	{								\
-	  if (!TARGET_RELOCATABLE)					\
+	  if (!TARGET_RELOCATABLE && !TARGET_NO_TOC)			\
 	    fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);		\
 									\
 	  if (TARGET_MINIMAL_TOC)					\
 	    {								\
-	      if (!TARGET_RELOCATABLE)					\
+	      if (!TARGET_RELOCATABLE && !TARGET_NO_TOC)		\
 		{							\
 		  ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LCTOC", 0);	\
 		  fprintf (asm_out_file, "\t.tc ");			\

gcc/config/rs6000/t-ppcgas

@@ -16,9 +16,11 @@ fp-bit.c: $(srcdir)/config/fp-bit.c
 # Build libgcc.a with different options.
 
 MULTILIB_OPTIONS	= msoft-float \
+			  mno-toc \
 			  mlittle/mbig
 
 MULTILIB_DIRNAMES	= soft-float \
+			  no-toc \
 			  little-endian big-endian
 
 MULTILIB_MATCHES	= mlittle=mlittle-endian \