diff options
| author | Nick Hainke <vincent@systemli.org> | 2023-05-03 16:46:52 +0200 |
|---|---|---|
| committer | Christian Marangi <ansuelsmth@gmail.com> | 2023-05-05 15:46:38 +0200 |
| commit | a6d689632c5326e4869937c0ff5f9c72f6190729 (patch) | |
| tree | 2079482dc4bef4e6f3d2534192a5c56b5976d996 | |
| parent | 29128b0bd43532404d965d22338554fce624db6a (diff) | |
| download | upstream-a6d689632c5326e4869937c0ff5f9c72f6190729.tar.gz upstream-a6d689632c5326e4869937c0ff5f9c72f6190729.tar.bz2 upstream-a6d689632c5326e4869937c0ff5f9c72f6190729.zip | |
toolchain: gcc: backport patch for gcc 13 fixing access path analysis
While improving access path analysis a typo happened. Now it can happen
that gcc misscompiles. The patch is fixing the issue. However, also
other gcc versions 10.2+ are affected. They also should be bumped or the
fix should be backported.
For more bug information have a look at:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109585
Signed-off-by: Nick Hainke <vincent@systemli.org>
| -rw-r--r-- | toolchain/gcc/patches-13.x/001-rtl-optimization-109585-alias-analysis-typo.patch | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/toolchain/gcc/patches-13.x/001-rtl-optimization-109585-alias-analysis-typo.patch b/toolchain/gcc/patches-13.x/001-rtl-optimization-109585-alias-analysis-typo.patch new file mode 100644 index 0000000000..7f73be4325 --- /dev/null +++ b/toolchain/gcc/patches-13.x/001-rtl-optimization-109585-alias-analysis-typo.patch @@ -0,0 +1,69 @@ +From bb406a6aea336966681927a27f54ee89c4fd4ea1 Mon Sep 17 00:00:00 2001 +From: Richard Biener <rguenther@suse.de> +Date: Mon, 24 Apr 2023 13:31:07 +0200 +Subject: [PATCH] rtl-optimization/109585 - alias analysis typo + +When r10-514-gc6b84edb6110dd2b4fb improved access path analysis +it introduced a typo that triggers when there's an access to a +trailing array in the first access path leading to false +disambiguation. + + PR rtl-optimization/109585 + * tree-ssa-alias.cc (aliasing_component_refs_p): Fix typo. + + * gcc.dg/torture/pr109585.c: New testcase. + +(cherry picked from commit 6d4bd27a60447c7505cb4783e675e98a191a8904) +--- + gcc/testsuite/gcc.dg/torture/pr109585.c | 33 +++++++++++++++++++++++++ + gcc/tree-ssa-alias.cc | 2 +- + 2 files changed, 34 insertions(+), 1 deletion(-) + create mode 100644 gcc/testsuite/gcc.dg/torture/pr109585.c + +--- /dev/null ++++ b/gcc/testsuite/gcc.dg/torture/pr109585.c +@@ -0,0 +1,33 @@ ++/* { dg-do run } */ ++ ++#include <stdlib.h> ++ ++struct P { ++ long v; ++ struct P *n; ++}; ++ ++struct F { ++ long x; ++ struct P fam[]; ++}; ++ ++int __attribute__((noipa)) ++f(struct F *f, int i) ++{ ++ struct P *p = f->fam; ++ asm("" : "+r"(f): "r"(p)); ++ p->v = 0; ++ p->n = 0; ++ return f->fam->n != 0; ++} ++ ++int ++main() ++{ ++ struct F *m = malloc (sizeof (long) + 2 * sizeof (struct P)); ++ m->fam[0].n = &m->fam[1]; ++ if (f (m, 0)) ++ abort (); ++ return 0; ++} +--- a/gcc/tree-ssa-alias.cc ++++ b/gcc/tree-ssa-alias.cc +@@ -1330,7 +1330,7 @@ aliasing_component_refs_p (tree ref1, + /* If we didn't find a common base, try the other way around. */ + if (cmp_outer <= 0 + || (end_struct_ref1 +- && compare_type_sizes (TREE_TYPE (end_struct_ref1), type1) <= 0)) ++ && compare_type_sizes (TREE_TYPE (end_struct_ref1), type2) <= 0)) + { + int res = aliasing_component_refs_walk (ref2, type2, base2, + offset2, max_size2, |