[committed] i386: Fix ICE with -fsplit-stack -mcmodel=large [PR112686]

[Uros Bizjak]

For -mcmodel=large, we have to load function address to a register.

    PR target/112686

gcc/ChangeLog:

    * config/i386/i386.cc (ix86_expand_split_stack_prologue): Load
    function address to a register for ix86_cmodel == CM_LARGE.

gcc/testsuite/ChangeLog:

    * gcc.target/i386/pr112686.c: New test.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Uros.

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 7b922857d80..9390f525b99 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -10481,6 +10481,8 @@ ix86_expand_split_stack_prologue (void)
              SYMBOL_REF_FLAGS (split_stack_fn_large) |= SYMBOL_FLAG_LOCAL;
            }
 
+         fn = split_stack_fn_large;
+
          if (ix86_cmodel == CM_LARGE_PIC)
            {
              rtx_code_label *label;
@@ -10494,16 +10496,15 @@ ix86_expand_split_stack_prologue (void)
              emit_insn (gen_set_rip_rex64 (reg10, label));
              emit_insn (gen_set_got_offset_rex64 (reg11, label));
              emit_insn (gen_add2_insn (reg10, reg11));
-             x = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, split_stack_fn_large),
-                                 UNSPEC_GOT);
+             x = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, fn), UNSPEC_GOT);
              x = gen_rtx_CONST (Pmode, x);
              emit_move_insn (reg11, x);
              x = gen_rtx_PLUS (Pmode, reg10, reg11);
              x = gen_const_mem (Pmode, x);
              fn = copy_to_suggested_reg (x, reg11, Pmode);
            }
-         else
-           fn = split_stack_fn_large;
+         else if (ix86_cmodel == CM_LARGE)
+           fn = copy_to_suggested_reg (fn, reg11, Pmode);
 
          /* When using the large model we need to load the address
             into a register, and we've run out of registers.  So we
diff --git a/gcc/testsuite/gcc.target/i386/pr112686.c 
b/gcc/testsuite/gcc.target/i386/pr112686.c
new file mode 100644
index 00000000000..858e91ba727
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr112686.c
@@ -0,0 +1,5 @@
+/* PR target/112686 */
+/* { dg-do compile { target lp64 } } */
+/* { dg-options "-fsplit-stack -mcmodel=large" } */
+
+void foo (void) {}