[PATCH, i386]: Fix PR 55247, ICE: Max. number of generated reload insns per insn is achieved

[Uros Bizjak]

Hello!

Attached patch disparages riF->o alternative of *movti_internal_rex64
insn, as described by Vlad in comment #2 [1]

The core of the problem however is, that gcc is unable to detect
zero-extended address as offsetable. H.J. will propose a patch for
this [2].

2012-11-10  Vladimir Makarov  <vmaka...@redhat.com>
            Uros Bizjak  <ubiz...@gmail.com>

        PR target/55247
        * config/i386/i386.md (*movti_internal_rex64): Add "!" to riF->o
        alternative.

testsuite/ChangeLog:

2012-11-10  Uros Bizjak  <ubiz...@gmail.com>

        PR target/55247
        * gcc.target/i386/pr55247.c: New test.

Tested on x86_64-linux-gnu {,m32} and committed to mainline SVN.

[1] gcc.gnu.org/bugzilla/show_bug.cgi?id=55247#c2
[2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55247#c6

Uros.

Index: config/i386/i386.md
===================================================================
--- config/i386/i386.md (revision 193387)
+++ config/i386/i386.md (working copy)
@@ -1874,7 +1874,7 @@
              (const_string "OI")))])
 
 (define_insn "*movti_internal_rex64"
-  [(set (match_operand:TI 0 "nonimmediate_operand" "=!r ,o  ,x,x ,m")
+  [(set (match_operand:TI 0 "nonimmediate_operand" "=!r ,!o ,x,x ,m")
        (match_operand:TI 1 "general_operand"      "riFo,riF,C,xm,x"))]
   "TARGET_64BIT && !(MEM_P (operands[0]) && MEM_P (operands[1]))"
 {
Index: testsuite/gcc.target/i386/pr55247.c
===================================================================
--- testsuite/gcc.target/i386/pr55247.c (revision 0)
+++ testsuite/gcc.target/i386/pr55247.c (working copy)
@@ -0,0 +1,38 @@
+/* { dg-do compile { target { ! { ia32 } } } } */
+/* { dg-options "-O2 -mx32 -maddress-mode=long -mno-sse" } */
+
+typedef unsigned int uint32_t;
+typedef unsigned int uintptr_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];
+};
+typedef struct link_map *lookup_t;
+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));
+  const Elf32_Sym *refsym = &symtab[((reloc->r_info) >> 8)];
+  const Elf32_Sym *defsym = refsym;
+  Elf32_Sym sym = *defsym;
+  symbind32 (&sym);
+}