diff options
Diffstat (limited to 'meta/recipes-devtools/gcc/gcc-4.6.0/gcc-4_6-branch-backports/0259-2011-05-12-Richard-Guenther-rguenther-suse.de.patch')
| -rw-r--r-- | meta/recipes-devtools/gcc/gcc-4.6.0/gcc-4_6-branch-backports/0259-2011-05-12-Richard-Guenther-rguenther-suse.de.patch | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/meta/recipes-devtools/gcc/gcc-4.6.0/gcc-4_6-branch-backports/0259-2011-05-12-Richard-Guenther-rguenther-suse.de.patch b/meta/recipes-devtools/gcc/gcc-4.6.0/gcc-4_6-branch-backports/0259-2011-05-12-Richard-Guenther-rguenther-suse.de.patch new file mode 100644 index 000000000..4754ace97 --- /dev/null +++ b/meta/recipes-devtools/gcc/gcc-4.6.0/gcc-4_6-branch-backports/0259-2011-05-12-Richard-Guenther-rguenther-suse.de.patch @@ -0,0 +1,100 @@ +From 32e55402bb0fc442831d775a516f2def4f948f93 Mon Sep 17 00:00:00 2001 +From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> +Date: Thu, 12 May 2011 14:08:00 +0000 +Subject: [PATCH] 2011-05-12 Richard Guenther <rguenther@suse.de> + + Backport from mainline + 2011-05-02 Richard Guenther <rguenther@suse.de> + + PR tree-optimization/48822 + * tree-ssa-sccvn.c (set_ssa_val_to): Never go up the lattice. + (process_scc): Indicate which iteration we start. + + * gcc.dg/torture/pr48822.c: New testcase. + + +git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch@173705 138bc75d-0d04-0410-961f-82ee72b054a4 + +index be253f4..81b52db 100644 +new file mode 100644 +index 0000000..b619f36 +--- /dev/null ++++ b/gcc/testsuite/gcc.dg/torture/pr48822.c +@@ -0,0 +1,20 @@ ++/* { dg-do compile } */ ++ ++void foo (int *, int *); ++int bar () ++{ ++ int a = 0; ++ int b = 0; ++ if (b != 0) ++ { ++ int ax = a; ++ int bx = b; ++ while (bx != 0) ++ { ++ int tem = ax % bx; ++ ax = bx; ++ bx = tem; ++ } ++ } ++ foo (&a, &b); ++} +diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c +index 9222cb5..eb88969 100644 +--- a/gcc/tree-ssa-sccvn.c ++++ b/gcc/tree-ssa-sccvn.c +@@ -2103,12 +2103,26 @@ print_scc (FILE *out, VEC (tree, heap) *scc) + static inline bool + set_ssa_val_to (tree from, tree to) + { +- tree currval; ++ tree currval = SSA_VAL (from); + +- if (from != to +- && TREE_CODE (to) == SSA_NAME +- && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (to)) +- to = from; ++ if (from != to) ++ { ++ if (currval == from) ++ { ++ if (dump_file && (dump_flags & TDF_DETAILS)) ++ { ++ fprintf (dump_file, "Not changing value number of "); ++ print_generic_expr (dump_file, from, 0); ++ fprintf (dump_file, " from VARYING to "); ++ print_generic_expr (dump_file, to, 0); ++ fprintf (dump_file, "\n"); ++ } ++ return false; ++ } ++ else if (TREE_CODE (to) == SSA_NAME ++ && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (to)) ++ to = from; ++ } + + /* The only thing we allow as value numbers are VN_TOP, ssa_names + and invariants. So assert that here. */ +@@ -2125,8 +2139,6 @@ set_ssa_val_to (tree from, tree to) + print_generic_expr (dump_file, to, 0); + } + +- currval = SSA_VAL (from); +- + if (currval != to && !operand_equal_p (currval, to, OEP_PURE_SAME)) + { + VN_INFO (from)->valnum = to; +@@ -3124,6 +3136,8 @@ process_scc (VEC (tree, heap) *scc) + { + changed = false; + iterations++; ++ if (dump_file && (dump_flags & TDF_DETAILS)) ++ fprintf (dump_file, "Starting iteration %d\n", iterations); + /* As we are value-numbering optimistically we have to + clear the expression tables and the simplified expressions + in each iteration until we converge. */ +-- +1.7.0.4 + |