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Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index eea7476..4fabd73382 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -2263,6 +2263,16 @@ simplify_context::simplify_associative_operation (rtx_code code, { rtx tem; + /* Normally expressions simplified by simplify-rtx.c are combined + at most from a few machine instructions and therefore the + expressions should be fairly small. During var-tracking + we can see arbitrarily large expressions though and reassociating + those can be quadratic, so punt after encountering max_assoc_count + simplify_associative_operation calls during outermost simplify_* + call. */ + if (++assoc_count >= max_assoc_count) + return NULL_RTX; + /* Linearize the operator to the left. */ if (GET_CODE (op1) == code) { |