backport: re PR rtl-optimization/52139 (ICE: in remove_insn, at emit-rtl.c:3960 with...

	Backported from mainline
	2012-02-08  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/52139
	* cfgrtl.c (cfg_layout_merge_blocks): If BB_END
	is a BARRIER after emit_insn_after_noloc, move BB_END
	to the last non-BARRIER insn before it.

	* gcc.dg/pr52139.c: New test.

From-SVN: r184074

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index eaa27374ff7e3d18bf54ef2d488f4ef198002393..7705d34ba7395f791374035d6e3de6136a78243e 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,6 +1,13 @@
 2012-02-09  Jakub Jelinek  <jakub@redhat.com>
 
        Backported from mainline
+       2012-02-08  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/52139
+       * cfgrtl.c (cfg_layout_merge_blocks): If BB_END
+       is a BARRIER after emit_insn_after_noloc, move BB_END
+       to the last non-BARRIER insn before it.
+
        2012-01-19  Jakub Jelinek  <jakub@redhat.com>
 
        PR libmudflap/40778

diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
index 814ad7846f42c5e51fec4c973c1875e87ea9f485..c197b0eac98c1441f92c3599e7eb22638000a295 100644 (file)
--- a/gcc/cfgrtl.c
+++ b/gcc/cfgrtl.c
@@ -2790,6 +2790,11 @@ cfg_layout_merge_blocks (basic_block a, basic_block b)
       rtx first = BB_END (a), last;
 
       last = emit_insn_after_noloc (b->il.rtl->header, BB_END (a), a);
+      /* The above might add a BARRIER as BB_END, but as barriers
+        aren't valid parts of a bb, remove_insn doesn't update
+        BB_END if it is a barrier.  So adjust BB_END here.  */
+      while (BB_END (a) != first && BARRIER_P (BB_END (a)))
+       BB_END (a) = PREV_INSN (BB_END (a));
       delete_insn_chain (NEXT_INSN (first), last, false);
       b->il.rtl->header = NULL;
     }

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1c950d84b858801f98eb4c442e16abe24390a1a7..d4ef9a7626d15b75a5c103a08d421cc100f6aafe 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,6 +1,11 @@
 2012-02-09  Jakub Jelinek  <jakub@redhat.com>
 
        Backported from mainline
+       2012-02-08  Jakub Jelinek  <jakub@redhat.com>
+
+       PR rtl-optimization/52139
+       * gcc.dg/pr52139.c: New test.
+
        2012-01-05  Jakub Jelinek  <jakub@redhat.com>
 
        PR rtl-optimization/51767

diff --git a/gcc/testsuite/gcc.dg/pr52139.c b/gcc/testsuite/gcc.dg/pr52139.c
new file mode 100644 (file)
index 0000000..d10adf2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr52139.c
@@ -0,0 +1,49 @@
+/* PR rtl-optimization/52139 */
+/* { dg-do compile } */
+/* { dg-options "-O -fno-tree-dominator-opts -fno-tree-fre" } */
+/* { dg-options "-O -fno-tree-dominator-opts -fno-tree-fre -fpic" { target fpic } } */
+
+void *p;
+
+void
+foo (int a)
+{
+  switch (a)
+    {
+    case 0:
+    a0:
+    case 1:
+    a1:
+      p = &&a1;
+    case 2:
+    a2:
+      p = &&a2;
+    case 3:
+    a3:
+      p = &&a3;
+    case 4:
+    a4:
+      p = &&a4;
+    case 5:
+    a5:
+      p = &&a5;
+    case 6:
+    a6:
+      p = &&a6;
+    case 7:
+    a7:
+      p = &&a7;
+    case 8:
+    a8:
+      p = &&a8;
+    case 9:
+    a9:
+      p = &&a9;
+    case 10:
+    a10:
+      p = &&a10;
+    default:
+      p = &&a0;
+    }
+  goto *p;
+}