diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/AMD64.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/AMD64.rules | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/AMD64.rules b/src/cmd/compile/internal/ssa/gen/AMD64.rules index b5133d6c14..2c9fe4a59b 100644 --- a/src/cmd/compile/internal/ssa/gen/AMD64.rules +++ b/src/cmd/compile/internal/ssa/gen/AMD64.rules @@ -317,7 +317,7 @@ // Medium copying uses a duff device. (Move [s] dst src mem) && s > 64 && s <= 16*64 && s%16 == 0 - && !config.noDuffDevice -> + && !config.noDuffDevice && logLargeCopy(v, s) -> (DUFFCOPY [14*(64-s/16)] dst src mem) // 14 and 64 are magic constants. 14 is the number of bytes to encode: // MOVUPS (SI), X0 @@ -327,7 +327,7 @@ // and 64 is the number of such blocks. See src/runtime/duff_amd64.s:duffcopy. // Large copying uses REP MOVSQ. -(Move [s] dst src mem) && (s > 16*64 || config.noDuffDevice) && s%8 == 0 -> +(Move [s] dst src mem) && (s > 16*64 || config.noDuffDevice) && s%8 == 0 && logLargeCopy(v, s) -> (REPMOVSQ dst src (MOVQconst [s/8]) mem) // Lowering Zero instructions |