Sparc backend rewrite by rth and myself, please

peruse the lengthy ChangeLog for a blow by blow account.

Co-Authored-By: Richard Henderson <rth@cygnus.com>

From-SVN: r21652

gcc/config/sparc/sp64-elf.h

@@ -102,9 +102,10 @@ crtbegin.o%s \
 /* The medium/anywhere code model practically requires us to put jump tables
    in the text section as gcc is unable to distinguish LABEL_REF's of jump
    tables from other label refs (when we need to).  */
-/* ??? Revisit this.  */
+/* But we now defer the tables to the end of the function, so we make
+   this 0 to not confuse the branch shortening code.  */
 #undef JUMP_TABLES_IN_TEXT_SECTION
-#define JUMP_TABLES_IN_TEXT_SECTION 1
+#define JUMP_TABLES_IN_TEXT_SECTION 0
 
 /* System V Release 4 uses DWARF debugging info.
    GDB doesn't support 64 bit stabs yet and the desired debug format is DWARF

gcc/config/sparc/sysv4.h

@@ -66,7 +66,9 @@ Boston, MA 02111-1307, USA.  */
 /* The native assembler can't compute differences between symbols in different
    sections when generating pic code, so we must put jump tables in the
    text section.  */
-#define JUMP_TABLES_IN_TEXT_SECTION 1
+/* But we now defer the tables to the end of the function, so we make
+   this 0 to not confuse the branch shortening code.  */
+#define JUMP_TABLES_IN_TEXT_SECTION 0
 
 /* Pass -K to the assembler when PIC.  */
 #undef ASM_SPEC

gcc/final.c

@@ -2326,6 +2326,11 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
 	  if (GET_CODE (nextbody) == ADDR_VEC
 	      || GET_CODE (nextbody) == ADDR_DIFF_VEC)
 	    {
+#if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
+	      /* In this case, the case vector is being moved by the
+		 target, so don't output the label at all.  Leave that
+		 to the back end macros.  */
+#else
 	      if (! JUMP_TABLES_IN_TEXT_SECTION)
 		{
 		  readonly_data_section ();
@@ -2344,6 +2349,7 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
 #else
 	      ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (insn));
 #endif
+#endif
 	      break;
 	    }
 	}
@@ -2397,6 +2403,24 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
 		app_on = 0;
 	      }
 
+#if defined(ASM_OUTPUT_ADDR_VEC) || defined(ASM_OUTPUT_ADDR_DIFF_VEC)
+	    if (GET_CODE (body) == ADDR_VEC)
+	      {
+#ifdef ASM_OUTPUT_ADDR_VEC
+		ASM_OUTPUT_ADDR_VEC (PREV_INSN (insn), body);
+#else
+		abort();
+#endif
+	      }
+	    else
+	      {
+#ifdef ASM_OUTPUT_ADDR_DIFF_VEC
+		ASM_OUTPUT_ADDR_DIFF_VEC (PREV_INSN (insn), body);
+#else
+		abort();
+#endif
+	      }
+#else
 	    vlen = XVECLEN (body, GET_CODE (body) == ADDR_DIFF_VEC);
 	    for (idx = 0; idx < vlen; idx++)
 	      {
@@ -2427,6 +2451,7 @@ final_scan_insn (insn, file, optimize, prescan, nopeepholes)
 				 CODE_LABEL_NUMBER (PREV_INSN (insn)),
 				 insn);
 #endif
+#endif
 
 	    function_section (current_function_decl);
 

gcc/reorg.c

@@ -4660,6 +4660,13 @@ dbr_schedule (first, file)
     {
       int pred_flags;
 
+      if (GET_CODE (insn) == INSN)
+        {
+	  rtx pat = PATTERN (insn);
+
+	  if (GET_CODE (pat) == SEQUENCE)
+	    insn = XVECEXP (pat, 0, 0);
+	}
       if (GET_CODE (insn) != JUMP_INSN)
 	continue;