[PATCH] gcc-10.1: add fix for PR 96130

["Dmitry Baryshkov" <dbaryshkov@gmail.com>]

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96130 causing ICE
(SegFault) when compiling current Mesa git tree.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 meta/recipes-devtools/gcc/gcc-10.1.inc        |   1 +
 .../gcc/gcc-10.1/pr96130.patch                | 106 ++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 meta/recipes-devtools/gcc/gcc-10.1/pr96130.patch

diff --git a/meta/recipes-devtools/gcc/gcc-10.1.inc b/meta/recipes-devtools/gcc/gcc-10.1.inc
index a3de91a2c6a3..a2dd2ae252a5 100644
--- a/meta/recipes-devtools/gcc/gcc-10.1.inc
+++ b/meta/recipes-devtools/gcc/gcc-10.1.inc
@@ -66,6 +66,7 @@ SRC_URI = "\
            file://0036-Enable-CET-in-cross-compiler-if-possible.patch \
            file://0037-mingw32-Enable-operation_not_supported.patch \
            file://0038-libatomic-Do-not-enforce-march-on-aarch64.patch \
+           file://pr96130.patch \
 "
 SRC_URI[sha256sum] = "b6898a23844b656f1b68691c5c012036c2e694ac4b53a8918d4712ad876e7ea2"
 
diff --git a/meta/recipes-devtools/gcc/gcc-10.1/pr96130.patch b/meta/recipes-devtools/gcc/gcc-10.1/pr96130.patch
new file mode 100644
index 000000000000..f0e6f85e22f9
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-10.1/pr96130.patch
@@ -0,0 +1,106 @@
+From 0d03c0ee5213703ec6d9ffa632fa5298d83adaaa Mon Sep 17 00:00:00 2001
+From: Jakub Jelinek <jakub@redhat.com>
+Date: Mon, 13 Jul 2020 18:25:53 +0200
+Subject: [PATCH] ipa-fnsummary: Fix ICE with switch predicates [PR96130]
+
+The following testcase ICEs since r10-3199.
+There is a switch with default label, where the controlling expression has
+range just 0..7 and there are case labels for all those 8 values, but
+nothing has yet optimized away the default.
+Since r10-3199, set_switch_stmt_execution_predicate sets the switch to
+default label's edge's predicate to a false predicate and then
+compute_bb_predicates propagates the predicates through the cfg, but false
+predicates aren't really added.  The caller of compute_bb_predicates
+in one place handles NULL bb->aux as false predicate:
+      if (fbi.info)
+	{
+	  if (bb->aux)
+	    bb_predicate = *(predicate *) bb->aux;
+	  else
+	    bb_predicate = false;
+	}
+      else
+	bb_predicate = true;
+but then in two further spots that the patch below is changing
+it assumes bb->aux must be non-NULL.  Those two spots are guarded by a
+condition that is only true if fbi.info is non-NULL, so I think the right
+fix is to treat NULL aux as false predicate in those spots too.
+
+2020-07-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR ipa/96130
+	* ipa-fnsummary.c (analyze_function_body): Treat NULL bb->aux
+	as false predicate.
+
+	* gcc.dg/torture/pr96130.c: New test.
+
+(cherry picked from commit 776e48e0931db69f158f40e5cb8e15463d879a42)
+---
+ gcc/ipa-fnsummary.c                    | 10 ++++++++--
+ gcc/testsuite/gcc.dg/torture/pr96130.c | 26 ++++++++++++++++++++++++++
+ 2 files changed, 34 insertions(+), 2 deletions(-)
+ create mode 100644 gcc/testsuite/gcc.dg/torture/pr96130.c
+
+diff --git a/gcc/ipa-fnsummary.c b/gcc/ipa-fnsummary.c
+index 045a0ecf766..55a0b272a96 100644
+--- a/gcc/ipa-fnsummary.c
++++ b/gcc/ipa-fnsummary.c
+@@ -2766,7 +2766,10 @@ analyze_function_body (struct cgraph_node *node, bool early)
+ 	  edge ex;
+ 	  unsigned int j;
+ 	  class tree_niter_desc niter_desc;
+-	  bb_predicate = *(predicate *) loop->header->aux;
++	  if (loop->header->aux)
++	    bb_predicate = *(predicate *) loop->header->aux;
++	  else
++	    bb_predicate = false;
+ 
+ 	  exits = get_loop_exit_edges (loop);
+ 	  FOR_EACH_VEC_ELT (exits, j, ex)
+@@ -2799,7 +2802,10 @@ analyze_function_body (struct cgraph_node *node, bool early)
+ 	  for (unsigned i = 0; i < loop->num_nodes; i++)
+ 	    {
+ 	      gimple_stmt_iterator gsi;
+-	      bb_predicate = *(predicate *) body[i]->aux;
++	      if (body[i]->aux)
++		bb_predicate = *(predicate *) body[i]->aux;
++	      else
++		bb_predicate = false;
+ 	      for (gsi = gsi_start_bb (body[i]); !gsi_end_p (gsi);
+ 		   gsi_next (&gsi))
+ 		{
+diff --git a/gcc/testsuite/gcc.dg/torture/pr96130.c b/gcc/testsuite/gcc.dg/torture/pr96130.c
+new file mode 100644
+index 00000000000..f722b9ad2a9
+--- /dev/null
++++ b/gcc/testsuite/gcc.dg/torture/pr96130.c
+@@ -0,0 +1,26 @@
++/* PR ipa/96130 */
++/* { dg-do compile } */
++
++struct S { unsigned j : 3; };
++int k, l, m;
++
++void
++foo (struct S x)
++{
++  while (l != 5)
++    switch (x.j)
++      {
++      case 1:
++      case 3:
++      case 4:
++      case 6:
++      case 2:
++      case 5:
++	l = m;
++      case 7:
++      case 0:
++	k = 0;
++      default:
++	break;
++      }
++}
+-- 
+2.18.4
+
-- 
2.27.0