diff options
Diffstat (limited to 'libgo/go/runtime/stubs.go')
| -rw-r--r-- | libgo/go/runtime/stubs.go | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/libgo/go/runtime/stubs.go b/libgo/go/runtime/stubs.go index 84fa1c7..c454356b 100644 --- a/libgo/go/runtime/stubs.go +++ b/libgo/go/runtime/stubs.go @@ -107,16 +107,21 @@ func reflect_memmove(to, from unsafe.Pointer, n uintptr) { func memcmp(a, b unsafe.Pointer, size uintptr) int32 // exported value for testing -var hashLoad = loadFactor +var hashLoad = float32(loadFactorNum) / float32(loadFactorDen) //go:nosplit func fastrand() uint32 { mp := getg().m - fr := mp.fastrand - mx := uint32(int32(fr)>>31) & 0xa8888eef - fr = fr<<1 ^ mx - mp.fastrand = fr - return fr + // Implement xorshift64+: 2 32-bit xorshift sequences added together. + // Shift triplet [17,7,16] was calculated as indicated in Marsaglia's + // Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf + // This generator passes the SmallCrush suite, part of TestU01 framework: + // http://simul.iro.umontreal.ca/testu01/tu01.html + s1, s0 := mp.fastrand[0], mp.fastrand[1] + s1 ^= s1 << 17 + s1 = s1 ^ s0 ^ s1>>7 ^ s0>>16 + mp.fastrand[0], mp.fastrand[1] = s0, s1 + return s0 + s1 } //go:nosplit @@ -192,14 +197,16 @@ func publicationBarrier() // getcallerpc returns the program counter (PC) of its caller's caller. // getcallersp returns the stack pointer (SP) of its caller's caller. -// For both, the argp must be a pointer to the caller's first function argument. +// argp must be a pointer to the caller's first function argument. // The implementation may or may not use argp, depending on -// the architecture. +// the architecture. The implementation may be a compiler +// intrinsic; there is not necessarily code implementing this +// on every platform. // // For example: // // func f(arg1, arg2, arg3 int) { -// pc := getcallerpc(unsafe.Pointer(&arg1)) +// pc := getcallerpc() // sp := getcallersp(unsafe.Pointer(&arg1)) // } // @@ -219,7 +226,7 @@ func publicationBarrier() // immediately and can only be passed to nosplit functions. //go:noescape -func getcallerpc(argp unsafe.Pointer) uintptr +func getcallerpc() uintptr //go:noescape func getcallersp(argp unsafe.Pointer) uintptr @@ -430,7 +437,7 @@ func setpagesize(s uintptr) { } } -// Temporary for gccgo until we port mgc.go. +// Called by C code during library initialization. //go:linkname runtime_m0 runtime.runtime_m0 func runtime_m0() *m { return &m0 |