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Fix obvious Python performance suboptimality

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This commit is contained in:
Justine Tunney 2021-08-09 10:33:47 -07:00
parent 5a441ea57f
commit b703eee96e
1 changed files with 7 additions and 9 deletions
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16
third_party/python/Parser/node.c vendored
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@ -1,7 +1,9 @@
/* Parse tree node implementation */
/* clang-format off */
#include "Python.h"
#include "node.h"
#include "libc/nexgen32e/bsr.h"
#include "errcode.h"
node *
@ -20,17 +22,13 @@ PyNode_New(int type)
/* See comments at XXXROUNDUP below. Returns -1 on overflow. */
static int
fancy_roundup(int n)
fancy_roundup(int x)
{
/* Round up to the closest power of 2 >= n. */
int result = 256;
assert(n > 128);
while (result < n) {
result <<= 1;
if (result <= 0)
return -1;
}
return result;
int r;
assert(x > 128);
r = 1u << (bsr(x - 1) + 1); /* hacker's delight */
return r > 0 ? r : -1;
}
/* A gimmick to make massive numbers of reallocs quicker. The result is