diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/rewrite.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/rewrite.go | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/ssa/rewrite.go b/src/cmd/compile/internal/ssa/rewrite.go index eb8fa0c02a..70cd4c54cb 100644 --- a/src/cmd/compile/internal/ssa/rewrite.go +++ b/src/cmd/compile/internal/ssa/rewrite.go @@ -1358,7 +1358,8 @@ func zeroUpper56Bits(x *Value, depth int) bool { // isInlinableMemmove reports whether the given arch performs a Move of the given size // faster than memmove. It will only return true if replacing the memmove with a Move is -// safe, either because Move is small or because the arguments are disjoint. +// safe, either because Move will do all of its loads before any of its stores, or +// because the arguments are known to be disjoint. // This is used as a check for replacing memmove with Move ops. func isInlinableMemmove(dst, src *Value, sz int64, c *Config) bool { // It is always safe to convert memmove into Move when its arguments are disjoint. @@ -1377,6 +1378,9 @@ func isInlinableMemmove(dst, src *Value, sz int64, c *Config) bool { } return false } +func IsInlinableMemmove(dst, src *Value, sz int64, c *Config) bool { + return isInlinableMemmove(dst, src, sz, c) +} // logLargeCopy logs the occurrence of a large copy. // The best place to do this is in the rewrite rules where the size of the move is easy to find. @@ -1390,6 +1394,14 @@ func logLargeCopy(v *Value, s int64) bool { } return true } +func LogLargeCopy(funcName string, pos src.XPos, s int64) { + if s < 128 { + return + } + if logopt.Enabled() { + logopt.LogOpt(pos, "copy", "lower", funcName, fmt.Sprintf("%d bytes", s)) + } +} // hasSmallRotate reports whether the architecture has rotate instructions // for sizes < 32-bit. This is used to decide whether to promote some rotations. |