If you're going to have a conditional branch after
each 32x32->64-bit multiply, might as well shrink the code
and make it a loop.
This also avoids using the long multiply for small integers.
(This leaves the comments in a confusing state, but that's a separate
patch to make review easier.)
Signed-off-by: George Spelvin <li...@horizon.com>
---
lib/vsprintf.c | 20 ++++++--------------
1 file changed, 6 insertions(+), 14 deletions(-)
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index a8e7392..3ca77b8 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -174,20 +174,12 @@ char *put_dec_trunc8(char *buf, unsigned r)
unsigned q;
/* Copy of previous function's body with added early returns */
- q = (r * (uint64_t)0x1999999a) >> 32;
- *buf++ = (r - 10 * q) + '0'; /* 2 */
- if (q == 0)
- return buf;
- r = (q * (uint64_t)0x1999999a) >> 32;
- *buf++ = (q - 10 * r) + '0'; /* 3 */
- if (r == 0)
- return buf;
- q = (r * (uint64_t)0x1999999a) >> 32;
- *buf++ = (r - 10 * q) + '0'; /* 4 */
- if (q == 0)
- return buf;
- r = (q * (uint64_t)0x1999999a) >> 32;
- *buf++ = (q - 10 * r) + '0'; /* 5 */
+ while (r >= 10000) {
+ q = r + '0';
+ r = (r * (uint64_t)0x1999999a) >> 32;
+ *buf++ = q - 10*r;
+ }
+
if (r == 0)
return buf;
q = (r * 0x199a) >> 16;
--
1.7.10.4
--
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