i386: Add address spaces for fs/gs segments and tls

        * config/i386/i386-c.c (ix86_target_macros): Define __SEG_FS,
        __SEG_GS, __SEG_TLS.
        (ix86_register_pragmas): Register address spaces __seg_fs,
        __seg_gs, __seg_tls.
        * config/i386/i386-protos.h (enum ix86_address_seg): Remove.
        (ADDR_SPACE_SEG_FS, ADDR_SPACE_SEG_GS, ADDR_SPACE_SEG_TLS): New.
        (struct ix86_address): Use addr_space_t instead of ix86_address_seg.
        * config/i386/i386.c (ix86_decompose_address): Likewise.
        (ix86_legitimate_address_p): Likewise.
        (memory_address_length): Likewise.  Check mem address space too.
        (ix86_print_operand): Use ix86_print_operand_address_as.
        (ix86_print_operand_address_as): Rename from
        ix86_print_operand_address, add new addr_space_t parameter.
        Validate that either the parameter or the ix86_address segment
        is default address space.  Handle ADDR_SPACE_SEG_TLS.
        (ix86_print_operand_address): New.
        (ix86_addr_space_subset_p, TARGET_ADDR_SPACE_SUBSET_P): New.
        (ix86_addr_space_convert, TARGET_ADDR_SPACE_CONVERT): New.
        (ix86_addr_space_debug, TARGET_ADDR_SPACE_DEBUG): New.
        (ix86_addr_space_zero_address_valid): New.
        (TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID): New.
        * config/i386/i386.h (DEFAULT_TLS_SEG_REG): Use addr_space_t constants.
        * config/i386/rdos.h (DEFAULT_TLS_SEG_REG): Likewise.
        * config/i386/predicates.md (address_no_seg_operand): Likewise.
        (vsib_address_operand): Likewise.
        (address_mpx_no_base_operand): Likewise.
        (address_mpx_no_index_operand): Likewise.
        * doc/extend.texi (x86 Named Address Spaces): New section.

        * gcc.target/i386/addr-space-1.c: New test.
        * gcc.target/i386/addr-space-2.c: New test.
        * gcc.target/i386/addr-space-3.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230003 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

@@ -1,5 +1,34 @@
 2015-11-09  Richard Henderson  <rth@redhat.com>
 
+	* config/i386/i386-c.c (ix86_target_macros): Define __SEG_FS,
+	__SEG_GS, __SEG_TLS.
+	(ix86_register_pragmas): Register address spaces __seg_fs,
+	__seg_gs, __seg_tls.
+	* config/i386/i386-protos.h (enum ix86_address_seg): Remove.
+	(ADDR_SPACE_SEG_FS, ADDR_SPACE_SEG_GS, ADDR_SPACE_SEG_TLS): New.
+	(struct ix86_address): Use addr_space_t instead of ix86_address_seg.
+	* config/i386/i386.c (ix86_decompose_address): Likewise.
+	(ix86_legitimate_address_p): Likewise.
+	(memory_address_length): Likewise.  Check mem address space too.
+	(ix86_print_operand): Use ix86_print_operand_address_as.
+	(ix86_print_operand_address_as): Rename from
+	ix86_print_operand_address, add new addr_space_t parameter.
+	Validate that either the parameter or the ix86_address segment
+	is default address space.  Handle ADDR_SPACE_SEG_TLS.
+	(ix86_print_operand_address): New.
+	(ix86_addr_space_subset_p, TARGET_ADDR_SPACE_SUBSET_P): New.
+	(ix86_addr_space_convert, TARGET_ADDR_SPACE_CONVERT): New.
+	(ix86_addr_space_debug, TARGET_ADDR_SPACE_DEBUG): New.
+	(ix86_addr_space_zero_address_valid): New.
+	(TARGET_ADDR_SPACE_ZERO_ADDRESS_VALID): New.
+	* config/i386/i386.h (DEFAULT_TLS_SEG_REG): Use addr_space_t constants.
+	* config/i386/rdos.h (DEFAULT_TLS_SEG_REG): Likewise.
+	* config/i386/predicates.md (address_no_seg_operand): Likewise.
+	(vsib_address_operand): Likewise.
+	(address_mpx_no_base_operand): Likewise.
+	(address_mpx_no_index_operand): Likewise.
+	* doc/extend.texi (x86 Named Address Spaces): New section.
+
 	* config/i386/i386.c (ix86_check_no_addr_space): New.
 	(decide_alg): Add have_as parameter.
 	(alg_usable_p): Likewise; disable rep algorithms if set.

gcc/config/i386/i386-c.c

@@ -586,6 +586,10 @@ ix86_target_macros (void)
 			       ix86_tune,
 			       ix86_fpmath,
 			       cpp_define);
+
+  cpp_define (parse_in, "__SEG_FS");
+  cpp_define (parse_in, "__SEG_GS");
+  cpp_define (parse_in, "__SEG_TLS");
 }
 
 
@@ -600,6 +604,10 @@ ix86_register_pragmas (void)
   /* Update pragma hook to allow parsing #pragma GCC target.  */
   targetm.target_option.pragma_parse = ix86_pragma_target_parse;
 
+  c_register_addr_space ("__seg_fs", ADDR_SPACE_SEG_FS);
+  c_register_addr_space ("__seg_gs", ADDR_SPACE_SEG_GS);
+  c_register_addr_space ("__seg_tls", ADDR_SPACE_SEG_TLS);
+
 #ifdef REGISTER_SUBTARGET_PRAGMAS
   REGISTER_SUBTARGET_PRAGMAS ();
 #endif

gcc/config/i386/i386-protos.h

@@ -279,12 +279,11 @@ extern rtx maybe_get_pool_constant (rtx);
 extern char internal_label_prefix[16];
 extern int internal_label_prefix_len;
 
-enum ix86_address_seg { SEG_DEFAULT, SEG_FS, SEG_GS };
 struct ix86_address
 {
   rtx base, index, disp;
   HOST_WIDE_INT scale;
-  enum ix86_address_seg seg;
+  addr_space_t seg;
 };
 
 extern int ix86_decompose_address (rtx, struct ix86_address *);
@@ -326,3 +325,7 @@ struct ix86_first_cycle_multipass_data_
 # define TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DATA_T	\
   struct ix86_first_cycle_multipass_data_
 #endif /* RTX_CODE */
+
+const addr_space_t ADDR_SPACE_SEG_FS = 1;
+const addr_space_t ADDR_SPACE_SEG_GS = 2;
+const addr_space_t ADDR_SPACE_SEG_TLS = 3;