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Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/generic.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/generic.rules | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/generic.rules b/src/cmd/compile/internal/ssa/gen/generic.rules index 5cbc70cf41..e7ee3d0efd 100644 --- a/src/cmd/compile/internal/ssa/gen/generic.rules +++ b/src/cmd/compile/internal/ssa/gen/generic.rules @@ -590,6 +590,10 @@ // simplifications often used for lengths. e.g. len(s[i:i+5])==5 (Sub(64|32|16|8) (Add(64|32|16|8) x y) x) => y (Sub(64|32|16|8) (Add(64|32|16|8) x y) y) => x +(Sub(64|32|16|8) (Sub(64|32|16|8) x y) x) => (Neg(64|32|16|8) y) +(Sub(64|32|16|8) x (Add(64|32|16|8) x y)) => (Neg(64|32|16|8) y) +(Add(64|32|16|8) x (Sub(64|32|16|8) y x)) => y +(Add(64|32|16|8) x (Add(64|32|16|8) y (Sub(64|32|16|8) z x))) => (Add(64|32|16|8) y z) // basic phi simplifications (Phi (Const8 [c]) (Const8 [c])) => (Const8 [c]) |