PATCH: PR target/47715: [x32] Use SImode for thread pointer

[H.J. Lu]

Hi,

In x32, thread pointer is 32bit and choice of segment register for the
thread base ptr load should be based on TARGET_64BIT.  This patch
implements it.  OK for trunk?

Thanks.


H.J.
---
2011-07-27  H.J. Lu  <hongjiu...@intel.com>

        PR target/47715
        * config/i386/i386.c (get_thread_pointer): Use ptr_mode
        instead of Pmode with UNSPEC_TP.

        * config/i386/i386.md (tp_seg): Removed.
        (*load_tp_<mode>): Replace :P with :PTR.
        (*add_tp_<mode>): Likewise.
        (*load_tp_x32): New.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 8723dc5..d32d64d 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -12120,7 +12120,9 @@ get_thread_pointer (bool to_reg)
 {
   rtx tp, reg, insn;
 
-  tp = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, const0_rtx), UNSPEC_TP);
+  tp = gen_rtx_UNSPEC (ptr_mode, gen_rtvec (1, const0_rtx), UNSPEC_TP);
+  if (ptr_mode != Pmode)
+    tp = convert_to_mode (Pmode, tp, 1);
   if (!to_reg)
     return tp;
 
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index e91a299..c772f94 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -951,9 +951,14 @@
 ;; This mode iterator allows :P to be used for patterns that operate on
 ;; pointer-sized quantities.  Exactly one of the two alternatives will match.
 (define_mode_iterator P [(SI "Pmode == SImode") (DI "Pmode == DImode")])
+
+;; This mode iterator allows :PTR to be used for patterns that operate on
+;; ptr_mode sized quantities.
+(define_mode_iterator PTR
+  [(SI "ptr_mode == SImode") (DI "ptr_mode == DImode")])
 
 ;; Pointer modes in 64bit.
 (define_mode_iterator PTR64 [(SI "TARGET_X32") DI])
 
 ;; Scheduling descriptions
   output_asm_insn
     ("lea{q}\t{%a1@tlsgd(%%rip), %%rdi|rdi, %a1@tlsgd[rip]}", operands);
   fputs (ASM_SHORT "0x6666\n", asm_out_file);
 (define_insn "*tls_local_dynamic_base_32_gnu"
@@ -12438,15 +12451,28 @@
       (clobber (match_dup 5))
       (clobber (reg:CC FLAGS_REG))])])
 
-;; Segment register for the thread base ptr load
-(define_mode_attr tp_seg [(SI "gs") (DI "fs")])
-
-;; Load and add the thread base pointer from %<tp_seg>:0.
+;; Load and add the thread base pointer from %gs:0 or %fs:0.
 (define_insn "*load_tp_<mode>"
-  [(set (match_operand:P 0 "register_operand" "=r")
-       (unspec:P [(const_int 0)] UNSPEC_TP))]
+  [(set (match_operand:PTR 0 "register_operand" "=r")
+       (unspec:PTR [(const_int 0)] UNSPEC_TP))]
   ""
-  "mov{<imodesuffix>}\t{%%<tp_seg>:0, %0|%0, <iptrsize> PTR <tp_seg>:0}"
+{
+  if (TARGET_64BIT)
+    return "mov{<imodesuffix>}\t{%%fs:0, %0|%0, <iptrsize> PTR fs:0}";
+  else
+    return "mov{<imodesuffix>}\t{%%gs:0, %0|%0, <iptrsize> PTR gs:0}";
+}
+  [(set_attr "type" "imov")
+   (set_attr "modrm" "0")
+   (set_attr "length" "7")
+   (set_attr "memory" "load")
+   (set_attr "imm_disp" "false")])
+
+(define_insn "*load_tp_x32"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+       (zero_extend:DI (unspec:SI [(const_int 0)] UNSPEC_TP)))]
+  "TARGET_X32"
+  "mov{l}\t{%%fs:0, %k0|%k0, DWORD PTR fs:0}"
   [(set_attr "type" "imov")
    (set_attr "modrm" "0")
    (set_attr "length" "7")
@@ -12454,12 +12480,17 @@
    (set_attr "imm_disp" "false")])
 
 (define_insn "*add_tp_<mode>"
-  [(set (match_operand:P 0 "register_operand" "=r")
-       (plus:P (unspec:P [(const_int 0)] UNSPEC_TP)
-               (match_operand:P 1 "register_operand" "0")))
+  [(set (match_operand:PTR 0 "register_operand" "=r")
+       (plus:PTR (unspec:PTR [(const_int 0)] UNSPEC_TP)
+                 (match_operand:PTR 1 "register_operand" "0")))
    (clobber (reg:CC FLAGS_REG))]
   ""
-  "add{<imodesuffix>}\t{%%<tp_seg>:0, %0|%0, <iptrsize> PTR <tp_seg>:0}"
+{
+  if (TARGET_64BIT)
+    return "add{<imodesuffix>}\t{%%fs:0, %0|%0, <iptrsize> PTR fs:0}";
+  else
+    return "add{<imodesuffix>}\t{%%gs:0, %0|%0, <iptrsize> PTR gs:0}";
+}
   [(set_attr "type" "alu")
    (set_attr "modrm" "0")
    (set_attr "length" "7")