diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/strconv/itoa.go | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/src/strconv/itoa.go b/src/strconv/itoa.go index 29fec41fe2..928b37ffa6 100644 --- a/src/strconv/itoa.go +++ b/src/strconv/itoa.go @@ -152,13 +152,7 @@ func formatBits(dst []byte, u uint64, base int, neg, append_ bool) (d []byte, s } else if isPowerOfTwo(base) { // Use shifts and masks instead of / and %. - // Base is a power of 2 and 2 <= base <= len(digits) where len(digits) is 36. - // The largest power of 2 below or equal to 36 is 32, which is 1 << 5; - // i.e., the largest possible shift count is 5. By &-ind that value with - // the constant 7 we tell the compiler that the shift count is always - // less than 8 which is smaller than any register width. This allows - // the compiler to generate better code for the shift operation. - shift := uint(bits.TrailingZeros(uint(base))) & 7 + shift := uint(bits.TrailingZeros(uint(base))) b := uint64(base) m := uint(base) - 1 // == 1<<shift - 1 for u >= b { |