PATCH: Handle ZERO_EXTEND offsettable address

[H.J. Lu]

Hi,

In

(insn 19 17 20 2 (set (reg:TI 85 [ *_15 ])
        (mem:TI (zero_extend:DI (reg:SI 82)) [0 *_15+0 S16 A32])) x.i:29 61
{*movti_internal_rex64}
     (expr_list:REG_DEAD (reg:SI 82) 
        (expr_list:REG_EQUIV (mem/c:TI (plus:DI (reg/f:DI 20 frame)
                    (const_int -16 [0xfffffffffffffff0])) [0 sym+0 S16 A64])

we fail to see (mem:TI (zero_extend:DI (reg:SI 82))) is offsettable.
This patch adds ZERO_EXTEND support to adjust_address_1 and
offsettable_address_addr_space_p.  Tested on Linux/x32.  OK to install?

Thanks.


H.J.
---
gcc/

2012-11-10  H.J. Lu  <hongjiu...@intel.com>

        PR rtl-optimization/55247
        PR middle-end/55259
        * emit-rtl.c (adjust_address_1): Handle ZERO_EXTEND.
        * recog.c (offsettable_address_addr_space_p): Likewise.

gcc/testsuite/

2012-11-10  H.J. Lu  <hongjiu...@intel.com>

        PR rtl-optimization/55247
        PR middle-end/55259

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 95bbfa7..d7c454c 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -2109,6 +2109,12 @@ adjust_address_1 (rtx memref, enum machine_mode mode, 
HOST_WIDE_INT offset,
        addr = gen_rtx_LO_SUM (address_mode, XEXP (addr, 0),
                               plus_constant (address_mode,
                                              XEXP (addr, 1), offset));
+      else if (GET_CODE (addr) == ZERO_EXTEND)
+       {
+         addr = XEXP (addr, 0);
+         addr = plus_constant (GET_MODE (addr), addr, offset);
+         addr = gen_rtx_ZERO_EXTEND (address_mode, addr);
+       }
       else
        addr = plus_constant (address_mode, addr, offset);
     }
diff --git a/gcc/recog.c b/gcc/recog.c
index ee68e30..d3dd591 100644
--- a/gcc/recog.c
+++ b/gcc/recog.c
@@ -1934,15 +1934,21 @@ int
 offsettable_address_addr_space_p (int strictp, enum machine_mode mode, rtx y,
                                  addr_space_t as)
 {
-  enum rtx_code ycode = GET_CODE (y);
+  enum rtx_code ycode;
   rtx z;
-  rtx y1 = y;
+  rtx y1;
   rtx *y2;
   int (*addressp) (enum machine_mode, rtx, addr_space_t) =
     (strictp ? strict_memory_address_addr_space_p
             : memory_address_addr_space_p);
   unsigned int mode_sz = GET_MODE_SIZE (mode);
 
+  if (GET_CODE (y) == ZERO_EXTEND)
+    y = XEXP (y, 0);
+
+  ycode = GET_CODE (y);
+  y1 = y;
+
   if (CONSTANT_ADDRESS_P (y))
     return 1;
 
diff --git a/gcc/testsuite/gcc.target/i386/pr55247.c 
b/gcc/testsuite/gcc.target/i386/pr55247.c
new file mode 100644
index 0000000..594139e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr55247.c
@@ -0,0 +1,35 @@
+/* { dg-do compile { target { ! { ia32 } } } } */
+/* { dg-require-effective-target maybe_x32 } */
+/* { dg-options "-O -mno-sse -mno-mmx -mx32 -maddress-mode=long" } */
+
+typedef unsigned int uint32_t;
+typedef uint32_t Elf32_Word;
+typedef uint32_t Elf32_Addr;
+typedef struct {
+  Elf32_Word st_name;
+  Elf32_Addr st_value;
+  Elf32_Word st_size;
+  unsigned char st_other;
+} Elf32_Sym;
+typedef struct {
+  Elf32_Word r_info;
+}
+Elf32_Rela;
+typedef struct {
+  union {
+    Elf32_Addr d_ptr;
+  }
+  d_un;
+} Elf32_Dyn;
+struct link_map   {
+  Elf32_Dyn *l_info[34];
+};
+extern void symbind32 (Elf32_Sym *);
+void
+_dl_profile_fixup (struct link_map *l, Elf32_Word reloc_arg)
+{
+  const Elf32_Sym *const symtab  = (const void *) l->l_info[6]->d_un.d_ptr;
+  const Elf32_Rela *const reloc  = (const void *) (l->l_info[23]->d_un.d_ptr + 
reloc_arg * sizeof (Elf32_Rela));
+  Elf32_Sym sym = symtab[(reloc->r_info) >> 8];
+  symbind32 (&sym);
+}