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| author | Richard Biener <rguenther@suse.de> | 2023-12-04 14:50:59 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-12-04 15:33:58 +0100 |
| commit | 0c2ea80a4ffbddc0bc29f5badaf2ae43e59483b2 (patch) | |
| tree | 3eea2dce78a72ebb27d6791572b485a8f6db7b82 /gcc | |
| parent | 82576a6e77e0a284975dda87efe4b2d5bc5b9b1c (diff) | |
| download | gcc-0c2ea80a4ffbddc0bc29f5badaf2ae43e59483b2.zip gcc-0c2ea80a4ffbddc0bc29f5badaf2ae43e59483b2.tar.gz gcc-0c2ea80a4ffbddc0bc29f5badaf2ae43e59483b2.tar.bz2 | |
middle-end/112785 - guard against last_clique overflow
The PR shows that we'll ICE eventually when last_clique wraps. The
following avoids this by refusing to hand out new cliques after
exhausting them. We then use zero (no clique) as conservative
fallback.
PR middle-end/112785
* function.h (get_new_clique): New inline function handling
last_clique overflow.
* cfgrtl.cc (duplicate_insn_chain): Use it.
* tree-cfg.cc (gimple_duplicate_bb): Likewise.
* tree-inline.cc (remap_dependence_clique): Likewise.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cfgrtl.cc | 2 | ||||
| -rw-r--r-- | gcc/function.h | 11 | ||||
| -rw-r--r-- | gcc/tree-cfg.cc | 2 | ||||
| -rw-r--r-- | gcc/tree-inline.cc | 2 |
4 files changed, 14 insertions, 3 deletions
diff --git a/gcc/cfgrtl.cc b/gcc/cfgrtl.cc index abcb472..2a3f853 100644 --- a/gcc/cfgrtl.cc +++ b/gcc/cfgrtl.cc @@ -4385,7 +4385,7 @@ duplicate_insn_chain (rtx_insn *from, rtx_insn *to, { gcc_assert (MR_DEPENDENCE_CLIQUE (op) <= cfun->last_clique); - newc = ++cfun->last_clique; + newc = get_new_clique (cfun); } /* We cannot adjust MR_DEPENDENCE_CLIQUE in-place since MEM_EXPR is shared so make a copy and diff --git a/gcc/function.h b/gcc/function.h index 2984656..833c35e 100644 --- a/gcc/function.h +++ b/gcc/function.h @@ -518,6 +518,17 @@ set_loops_for_fn (struct function *fn, struct loops *loops) fn->x_current_loops = loops; } +/* Get a new unique dependence clique or zero if none is left. */ + +inline unsigned short +get_new_clique (function *fn) +{ + unsigned short clique = fn->last_clique + 1; + if (clique != 0) + fn->last_clique = clique; + return clique; +} + /* For backward compatibility... eventually these should all go away. */ #define current_function_funcdef_no (cfun->funcdef_no) diff --git a/gcc/tree-cfg.cc b/gcc/tree-cfg.cc index a30a2de..475ea5d 100644 --- a/gcc/tree-cfg.cc +++ b/gcc/tree-cfg.cc @@ -6595,7 +6595,7 @@ gimple_duplicate_bb (basic_block bb, copy_bb_data *id) if (!existed) { gcc_assert (MR_DEPENDENCE_CLIQUE (op) <= cfun->last_clique); - newc = ++cfun->last_clique; + newc = get_new_clique (cfun); } MR_DEPENDENCE_CLIQUE (op) = newc; } diff --git a/gcc/tree-inline.cc b/gcc/tree-inline.cc index e6d55305..a4fc839 100644 --- a/gcc/tree-inline.cc +++ b/gcc/tree-inline.cc @@ -1002,7 +1002,7 @@ remap_dependence_clique (copy_body_data *id, unsigned short clique) /* Clique 1 is reserved for local ones set by PTA. */ if (cfun->last_clique == 0) cfun->last_clique = 1; - newc = ++cfun->last_clique; + newc = get_new_clique (cfun); } return newc; } |