i386.c (ix86_stack_protect_guard): Generate memory reference to a SSP offset in TLS address space.

	* config/i386/i386.c (ix86_stack_protect_guard): Generate
	memory reference to a SSP offset in TLS address space.
	(ix86_print_operand) <case '@'>: Remove.
	(ix86_print_operand_punct_valid_p): Remove '@' code.
	* config/i386/i386.md (unspec): Remove UNSPEC_SP_TLS_SET and
	UNSPEC_SP_TLS_TEST.
	(stack_tls_protect_set_<mode>): Remove.
	(stack_protect_set): Do not call gen_stack_tls_protect_set_<mode>.
	(stack_tls_protect_test_<mode>): Remove.
	(stack_protect_test): Do not call gen_stack_tls_protect_test_<mode>.

From-SVN: r250932

3 files changed, 37 insertions, 57 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 596dd57..123ee7d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,4 +1,17 @@
-Olivier Hainque  <hainque@adacore.com>
+2017-08-06  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/i386.c (ix86_stack_protect_guard): Generate
+	memory reference to a SSP offset in TLS address space.
+	(ix86_print_operand) <case '@'>: Remove.
+	(ix86_print_operand_punct_valid_p): Remove '@' code.
+	* config/i386/i386.md (unspec): Remove UNSPEC_SP_TLS_SET and
+	UNSPEC_SP_TLS_TEST.
+	(stack_tls_protect_set_<mode>): Remove.
+	(stack_protect_set): Do not call gen_stack_tls_protect_set_<mode>.
+	(stack_tls_protect_test_<mode>): Remove.
+	(stack_protect_test): Do not call gen_stack_tls_protect_test_<mode>.
+
+2017-08-07  Olivier Hainque  <hainque@adacore.com>
 
 	PR target/81755
 	* config/vxworksae.h (VXWORKS_HAVE_TLS): Define.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index c0b6015..dfef996 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -18624,7 +18624,6 @@ print_reg (rtx x, int code, FILE *file)
    + -- print a branch hint as 'cs' or 'ds' prefix
    ; -- print a semicolon (after prefixes due to bug in older gas).
    ~ -- print "i" if TARGET_AVX2, "f" otherwise.
-   @ -- print a segment register of thread base pointer load
    ^ -- print addr32 prefix if TARGET_64BIT and Pmode != word_mode
    ! -- print MPX prefix for jxx/call/ret instructions if required.
  */
@@ -19168,19 +19167,6 @@ ix86_print_operand (FILE *file, rtx x, int code)
 #endif
 	  return;
 
-	case '@':
-	  if (ASSEMBLER_DIALECT == ASM_ATT)
-	    putc ('%', file);
-
-	  /* The kernel uses a different segment register for performance
-	     reasons; a system call would not have to trash the userspace
-	     segment register, which would be expensive.  */
-	  if (TARGET_64BIT && ix86_cmodel != CM_KERNEL)
-	    fputs ("fs", file);
-	  else
-	    fputs ("gs", file);
-	  return;
-
 	case '~':
 	  putc (TARGET_AVX2 ? 'i' : 'f', file);
 	  return;
@@ -19339,8 +19325,8 @@ ix86_print_operand (FILE *file, rtx x, int code)
 static bool
 ix86_print_operand_punct_valid_p (unsigned char code)
 {
-  return (code == '@' || code == '*' || code == '+' || code == '&'
-	  || code == ';' || code == '~' || code == '^' || code == '!');
+  return (code == '*' || code == '+' || code == '&' || code == ';'
+	  || code == '~' || code == '^' || code == '!');
 }
 
 /* Print a memory operand whose address is ADDR.  */
@@ -45810,13 +45796,31 @@ ix86_mangle_type (const_tree type)
 }
 
 #ifdef TARGET_THREAD_SSP_OFFSET
-/* If using TLS guards, don't waste time creating and expanding
-   __stack_chk_guard decl and MEM as we are going to ignore it.  */
 static tree
 ix86_stack_protect_guard (void)
 {
   if (TARGET_SSP_TLS_GUARD)
-    return NULL_TREE;
+    {
+      tree type_node = lang_hooks.types.type_for_mode (ptr_mode, 1);
+      addr_space_t as = DEFAULT_TLS_SEG_REG;
+
+      /* The kernel uses a different segment register for performance
+	 reasons; a system call would not have to trash the userspace
+	 segment register, which would be expensive.  */
+      if (ix86_cmodel == CM_KERNEL)
+	as = ADDR_SPACE_SEG_GS;
+
+      int qual = ENCODE_QUAL_ADDR_SPACE (as);
+
+      tree type = build_qualified_type (type_node, qual);
+      tree asptrtype = build_pointer_type (type);
+      tree sspoff = build_int_cst (asptrtype, TARGET_THREAD_SSP_OFFSET);
+
+      tree t = build2 (MEM_REF, asptrtype, sspoff,
+		       build_int_cst (asptrtype, 0));
+      return t;
+    }
+
   return default_stack_protect_guard ();
 }
 #endif
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 3465312..ebf63fd 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -61,7 +61,6 @@
 ;; + -- print a branch hint as 'cs' or 'ds' prefix
 ;; ; -- print a semicolon (after prefixes due to bug in older gas).
 ;; ~ -- print "i" if TARGET_AVX2, "f" otherwise.
-;; @ -- print a segment register of thread base pointer load
 ;; ^ -- print addr32 prefix if TARGET_64BIT and Pmode != word_mode
 ;; ! -- print MPX prefix for jxx/call/ret instructions if required.
 
@@ -166,8 +165,6 @@
   ;; SSP patterns
   UNSPEC_SP_SET
   UNSPEC_SP_TEST
-  UNSPEC_SP_TLS_SET
-  UNSPEC_SP_TLS_TEST
 
   ;; For ROUND support
   UNSPEC_ROUND
@@ -18718,16 +18715,9 @@
 {
   rtx (*insn)(rtx, rtx);
 
-#ifdef TARGET_THREAD_SSP_OFFSET
-  operands[1] = GEN_INT (TARGET_THREAD_SSP_OFFSET);
-  insn = (TARGET_LP64
-	  ? gen_stack_tls_protect_set_di
-	  : gen_stack_tls_protect_set_si);
-#else
   insn = (TARGET_LP64
 	  ? gen_stack_protect_set_di
 	  : gen_stack_protect_set_si);
-#endif
 
   emit_insn (insn (operands[0], operands[1]));
   DONE;
@@ -18743,16 +18733,6 @@
   "mov{<imodesuffix>}\t{%1, %2|%2, %1}\;mov{<imodesuffix>}\t{%2, %0|%0, %2}\;xor{l}\t%k2, %k2"
   [(set_attr "type" "multi")])
 
-(define_insn "stack_tls_protect_set_<mode>"
-  [(set (match_operand:PTR 0 "memory_operand" "=m")
-	(unspec:PTR [(match_operand:PTR 1 "const_int_operand" "i")]
-		    UNSPEC_SP_TLS_SET))
-   (set (match_scratch:PTR 2 "=&r") (const_int 0))
-   (clobber (reg:CC FLAGS_REG))]
-  ""
-  "mov{<imodesuffix>}\t{%@:%P1, %2|%2, <iptrsize> PTR %@:%P1}\;mov{<imodesuffix>}\t{%2, %0|%0, %2}\;xor{l}\t%k2, %k2"
-  [(set_attr "type" "multi")])
-
 (define_expand "stack_protect_test"
   [(match_operand 0 "memory_operand")
    (match_operand 1 "memory_operand")
@@ -18763,16 +18743,9 @@
 
   rtx (*insn)(rtx, rtx, rtx);
 
-#ifdef TARGET_THREAD_SSP_OFFSET
-  operands[1] = GEN_INT (TARGET_THREAD_SSP_OFFSET);
-  insn = (TARGET_LP64
-	  ? gen_stack_tls_protect_test_di
-	  : gen_stack_tls_protect_test_si);
-#else
   insn = (TARGET_LP64
 	  ? gen_stack_protect_test_di
 	  : gen_stack_protect_test_si);
-#endif
 
   emit_insn (insn (flags, operands[0], operands[1]));
 
@@ -18791,16 +18764,6 @@
   "mov{<imodesuffix>}\t{%1, %3|%3, %1}\;xor{<imodesuffix>}\t{%2, %3|%3, %2}"
   [(set_attr "type" "multi")])
 
-(define_insn "stack_tls_protect_test_<mode>"
-  [(set (match_operand:CCZ 0 "flags_reg_operand")
-	(unspec:CCZ [(match_operand:PTR 1 "memory_operand" "m")
-		     (match_operand:PTR 2 "const_int_operand" "i")]
-		    UNSPEC_SP_TLS_TEST))
-   (clobber (match_scratch:PTR 3 "=r"))]
-  ""
-  "mov{<imodesuffix>}\t{%1, %3|%3, %1}\;xor{<imodesuffix>}\t{%@:%P2, %3|%3, <iptrsize> PTR %@:%P2}"
-  [(set_attr "type" "multi")])
-
 (define_insn "sse4_2_crc32<mode>"
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec:SI