[PATCH, alpha]: FIX PR61586, ICE in alpha_handle_trap_shadows

[Uros Bizjak]

Hello!

Attached patch handles (barrier) RTXes that can be reached when
__builtin_trap builtin is used.

2014-06-26  Uros Bizjak  <ubiz...@gmail.com>

    PR target/61586
    * config/alpha/alpha.c (alpha_handle_trap_shadows): Handle BARRIER RTX.

testsuite/ChangeLog:

2014-06-26  Uros Bizjak  <ubiz...@gmail.com>

    PR target/61586
    * gcc.target/alpha/pr61586.c: New test.

Bootstrapped and regression tested on alphaev68-linux-gnu.

OK for mainline and 4.9 ?

Uros.

Index: config/alpha/alpha.c
===================================================================
--- config/alpha/alpha.c        (revision 211941)
+++ config/alpha/alpha.c        (working copy)
@@ -8717,6 +8717,11 @@ alpha_handle_trap_shadows (void)
                        }
                      break;
 
+                   case BARRIER:
+                     /* __builtin_unreachable can expand to no code at all,
+                        leaving (barrier) RTXes in the instruction stream.  */
+                     goto close_shadow_notrapb;
+
                    case JUMP_INSN:
                    case CALL_INSN:
                    case CODE_LABEL:
@@ -8732,6 +8737,7 @@ alpha_handle_trap_shadows (void)
                  n = emit_insn_before (gen_trapb (), i);
                  PUT_MODE (n, TImode);
                  PUT_MODE (i, TImode);
+               close_shadow_notrapb:
                  trap_pending = 0;
                  shadow.used.i = 0;
                  shadow.used.fp = 0;
Index: testsuite/gcc.target/alpha/pr61586.c
===================================================================
--- testsuite/gcc.target/alpha/pr61586.c        (revision 0)
+++ testsuite/gcc.target/alpha/pr61586.c        (working copy)
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mieee" } */
+
+void foo (int *dimensions, double **params, int hh)
+{
+  if (params[hh])
+    ;
+  else if (dimensions[hh] > 0)
+    params[hh][0] = 1.0f;
+}