diff options
Diffstat (limited to 'src/runtime/stack.go')
| -rw-r--r-- | src/runtime/stack.go | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/src/runtime/stack.go b/src/runtime/stack.go index 55e97e77af..c92accf188 100644 --- a/src/runtime/stack.go +++ b/src/runtime/stack.go @@ -12,6 +12,7 @@ import ( "internal/runtime/atomic" "internal/runtime/gc" "internal/runtime/sys" + "math/bits" "unsafe" ) @@ -181,12 +182,10 @@ func stackinit() { // stacklog2 returns ⌊log_2(n)⌋. func stacklog2(n uintptr) int { - log2 := 0 - for n > 1 { - n >>= 1 - log2++ + if n == 0 { + return 0 } - return log2 + return bits.Len64(uint64(n)) } // Allocates a stack from the free pool. Must be called with |