When running the same reproduction script as the previous patch,
it turns out the stack is too small, which can be easily avoided.
Signed-off-by: Stefan Beller <sbel...@google.com>
---
xdiff/xhistogram.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/xdiff/xhistogram.c b/xdiff/xhistogram.c
index fc2d3cd95d9..ec85f5992bd 100644
--- a/xdiff/xhistogram.c
+++ b/xdiff/xhistogram.c
@@ -318,7 +318,9 @@ static int histogram_diff(xpparam_t const *xpp, xdfenv_t
*env,
{
struct region lcs;
int lcs_found;
- int result = -1;
+ int result;
+redo:
+ result = -1;
if (count1 <= 0 && count2 <= 0)
return 0;
@@ -355,11 +357,17 @@ static int histogram_diff(xpparam_t const *xpp, xdfenv_t
*env,
line2, lcs.begin2 - line2);
if (result)
goto out;
- result = histogram_diff(xpp, env,
- lcs.end1 + 1, LINE_END(1) -
lcs.end1,
- lcs.end2 + 1, LINE_END(2) -
lcs.end2);
- if (result)
- goto out;
+ /*
+ * result = histogram_diff(xpp, env,
+ * lcs.end1 + 1, LINE_END(1) - lcs.end1,
+ * lcs.end2 + 1, LINE_END(2) - lcs.end2);
+ * but let's optimize tail recursion ourself:
+ */
+ count1 = LINE_END(1) - lcs.end1;
+ line1 = lcs.end1 + 1;
+ count2 = LINE_END(2) - lcs.end2;
+ line2 = lcs.end2 + 1;
+ goto redo;
}
}
out:
--
2.18.0.233.g985f88cf7e-goog
