Give gcc branch prediction some hits on obviously unlikely branches

ldso/ldso/arm/elfinterp.c

@@ -137,7 +137,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	symname = strtab + symtab[symtab_index].st_name;
 
 
-	if (reloc_type != R_ARM_JUMP_SLOT) {
+	if (unlikely(reloc_type != R_ARM_JUMP_SLOT)) {
 		_dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
 			_dl_progname);
 		_dl_exit(1);
@@ -151,7 +151,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	/* Get the address of the GOT entry */
 	new_addr = _dl_find_hash(symname,
 		tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!new_addr) {
+	if (unlikely(!new_addr)) {
 		_dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
 			_dl_progname, symname);
 		_dl_exit(1);
@@ -223,7 +223,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 		if (symtab_index)
 		  _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
 
-		if (res <0)
+		if (unlikely(res <0))
 		{
 		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 #if defined (__SUPPORT_LD_DEBUG__)
@@ -233,7 +233,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 #endif
 			_dl_exit(-res);
 		}
-		else if (res >0)
+		if (unlikely(res >0))
 		{
 			_dl_dprintf(2, "can't resolve symbol\n");
 			goof += res;
@@ -321,7 +321,7 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
 						newvalue = fix_bad_pc24(reloc_addr, symbol_addr)
 							- (unsigned long)reloc_addr + (addend << 2);
 						topbits = newvalue & 0xfe000000;
-						if (topbits != 0xfe000000 && topbits != 0x00000000)
+						if (unlikely(topbits != 0xfe000000 && topbits != 0x00000000))
 						{
 							_dl_dprintf(2,"symbol '%s': R_ARM_PC24 relocation out of range.",
 								symtab[symtab_index].st_name);

ldso/ldso/cris/elfinterp.c

@@ -131,7 +131,7 @@ _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
 	symname = strtab + symtab[symtab_index].st_name;
 
-	if (reloc_type != R_CRIS_JUMP_SLOT) {
+	if (unlikely(reloc_type != R_CRIS_JUMP_SLOT)) {
 		_dl_dprintf(2, "%s: Incorrect relocation type for jump relocations.\n",
 			_dl_progname);
 		_dl_exit(1);
@@ -143,7 +143,7 @@ _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 
 	/* Fetch the address of the GOT entry. */
 	new_addr = _dl_find_hash(symname, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!new_addr) {
+	if (unlikely(!new_addr)) {
 	    _dl_dprintf(2, "%s: Can't resolv symbol '%s'\n", _dl_progname, symname);
 	    _dl_exit(1);
 	}
@@ -210,7 +210,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope, unsigned long rel_add
 		if (symtab_index)
 			_dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
 
-		if (res < 0) {
+		if (unlikely(res < 0)) {
 			int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 
 #if defined (__SUPPORT_LD_DEBUG__)
@@ -220,7 +220,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope, unsigned long rel_add
 #endif
 			_dl_exit(-res);
 		}
-		else if (res > 0) {
+		if (unlikely(res > 0)) {
 			_dl_dprintf(2, "can't resolv symbol\n");
 			return res;
 		}

ldso/ldso/i386/elfinterp.c

@@ -217,7 +217,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 		if (symtab_index)
 		  _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
 
-		if (res <0)
+		if (unlikely(res <0))
 		{
 		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 #if defined (__SUPPORT_LD_DEBUG__)
@@ -227,7 +227,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 #endif
 			_dl_exit(-res);
 		}
-		else if (res >0)
+		if (unlikely(res >0))
 		{
 			_dl_dprintf(2, "can't resolve symbol\n");
 			return res;

ldso/ldso/m68k/elfinterp.c

@@ -79,7 +79,7 @@ unsigned int _dl_linux_resolver (int dummy1, int dummy2,
   strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
 
 
-  if (reloc_type != R_68K_JMP_SLOT)
+  if (unlikely(reloc_type != R_68K_JMP_SLOT))
     {
       _dl_dprintf (2, "%s: incorrect relocation type in jump relocations\n",
 		    _dl_progname);
@@ -99,7 +99,7 @@ unsigned int _dl_linux_resolver (int dummy1, int dummy2,
   /* Get the address of the GOT entry.  */
   new_addr = _dl_find_hash (strtab + symtab[symtab_index].st_name,
 			    tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-  if (!new_addr)
+  if (unlikely(!new_addr))
     {
       _dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
 		    _dl_progname, strtab + symtab[symtab_index].st_name);

ldso/ldso/mips/elfinterp.c

@@ -130,7 +130,7 @@ unsigned long _dl_linux_resolver(unsigned long sym_index,
 
 	new_addr = (unsigned long) _dl_find_hash(symname,
 			tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!new_addr) {
+	if (unlikely(!new_addr)) {
 		_dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
 				_dl_progname, symname);
 		_dl_exit (1);

ldso/ldso/powerpc/elfinterp.c

@@ -194,7 +194,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	debug_sym(symtab,strtab,symtab_index);
 	debug_reloc(symtab,strtab,this_reloc);
 
-	if (ELF32_R_TYPE(this_reloc->r_info) != R_PPC_JMP_SLOT) {
+	if (unlikely(ELF32_R_TYPE(this_reloc->r_info) != R_PPC_JMP_SLOT)) {
 		_dl_dprintf(2, "%s: Incorrect relocation type in jump relocation\n", _dl_progname);
 		_dl_exit(1);
 	};
@@ -211,7 +211,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	/* Get the address of the GOT entry */
 	finaladdr = (Elf32_Addr) _dl_find_hash(symname,
 			tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!finaladdr) {
+	if (unlikely(!finaladdr)) {
 		_dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
 		_dl_exit(1);
 	};
@@ -351,7 +351,7 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
 	case R_PPC_REL24:
 	{
 		Elf32_Sword delta = finaladdr - (Elf32_Word)reloc_addr;
-		if(delta<<6>>6 != delta){
+		if(unlikely(delta<<6>>6 != delta)) {
 			_dl_dprintf(2, "%s: symbol '%s' R_PPC_REL24 is out of range.\n\t"
 					"Compile shared libraries with -fPIC!\n",
 				    _dl_progname, symname);
@@ -472,7 +472,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 		if (symtab_index)
 		  _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
 
-		if (res <0)
+		if (unlikely(res <0))
 		{
 		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 #if defined (__SUPPORT_LD_DEBUG__)
@@ -482,7 +482,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 #endif
 			_dl_exit(-res);
 		}
-		else if (res >0)
+		if (unlikely(res >0))
 		{
 			_dl_dprintf(2, "can't resolve symbol\n");
 			return res;

ldso/ldso/sh/elfinterp.c

@@ -136,7 +136,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
 	symname = strtab + symtab[symtab_index].st_name;
 
-	if (reloc_type != R_SH_JMP_SLOT) {
+	if (unlikely(reloc_type != R_SH_JMP_SLOT)) {
 	  _dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
 		       _dl_progname);
 	  _dl_exit(1);
@@ -150,7 +150,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 
 	/* Get the address of the GOT entry */
 	new_addr = _dl_find_hash(symname, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!new_addr) {
+	if (unlikely(!new_addr)) {
 		_dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
 		_dl_exit(1);
 	}
@@ -222,7 +222,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 		if (symtab_index)
 		  _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
 
-		if (res <0)
+		if (unlikely(res <0))
 		{
 		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 #if defined (__SUPPORT_LD_DEBUG__)
@@ -232,7 +232,7 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 #endif
 			_dl_exit(-res);
 		}
-		else if (res >0)
+		if (unlikely(res >0))
 		{
 			_dl_dprintf(2, "can't resolve symbol\n");
 			return res;

ldso/ldso/sh64/elfinterp.c

@@ -177,7 +177,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 	strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
 	symname = strtab + symtab[symtab_index].st_name;
 
-	if (reloc_type != R_SH_JMP_SLOT) {
+	if (unlikely(reloc_type != R_SH_JMP_SLOT)) {
 		_dl_dprintf(2, "%s: Incorrect relocation type in jump reloc\n",
 			    _dl_progname);
 		_dl_exit(1);
@@ -191,7 +191,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
 
 	/* Get the address of the GOT entry */
 	new_addr = _dl_find_hash(symname, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-	if (!new_addr) {
+	if (unlikely(!new_addr)) {
 		_dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
 			    _dl_progname, symname);
 		_dl_exit(1);
@@ -268,7 +268,7 @@ static int _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 			_dl_dprintf(2, "symbol '%s': ",
 				strtab + symtab[symtab_index].st_name);
 
-		if (res < 0) {
+		if (unlikely(res < 0)) {
 		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
 
 			_dl_dprintf(2, "can't handle reloc type "
@@ -280,7 +280,8 @@ static int _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
 			);
 
 			_dl_exit(-res);
-		} else if (res > 0) {
+		}
+		if (unlikely(res > 0)) {
 			_dl_dprintf(2, "can't resolve symbol\n");
 
 			return res;

ldso/ldso/sparc/elfinterp.c

@@ -88,7 +88,7 @@ unsigned int _dl_linux_resolver(unsigned int reloc_entry, unsigned int * plt)
   _dl_dprintf(2, "strtab = %x\n", strtab);
 
 
-  if (reloc_type != R_SPARC_JMP_SLOT) {
+  if (unlikely(reloc_type != R_SPARC_JMP_SLOT)) {
     _dl_dprintf(2, "%s: incorrect relocation type in jump relocations (%d)\n",
 		  _dl_progname, reloc_type);
     _dl_exit(30);
@@ -110,7 +110,7 @@ unsigned int _dl_linux_resolver(unsigned int reloc_entry, unsigned int * plt)
   /* Get the address of the GOT entry */
   new_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name,
   			tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
-  if(!new_addr) {
+  if(unlikely(!new_addr)) {
     _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
 	       _dl_progname, strtab + symtab[symtab_index].st_name);
     _dl_exit(31);
@@ -225,7 +225,7 @@ int _dl_parse_relocation_information(struct dyn_elf *rpnt,
 
       symbol_addr = (unsigned int)
 	_dl_find_hash(strtab + symtab[symtab_index].st_name,
-		      tpnt->symbol_scope, elf_machine_type_class(reloc_type);
+		      tpnt->symbol_scope, elf_machine_type_class(reloc_type));
 
       if(!symbol_addr &&
 	 ELF32_ST_BIND(symtab [symtab_index].st_info) == STB_GLOBAL) {