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llgo/ssa.Slice optimize speed

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xushiwei
2024-05-24 08:23:01 +08:00
parent 88004cac76
commit 97e38255c6
3 changed files with 5 additions and 1 deletions
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internal/abi/llgo_autogen.lla
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internal/runtime/llgo_autogen.lla
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6
ssa/datastruct.go
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@@ -235,7 +235,8 @@ func (b Builder) Slice(x, low, high, max Expr) (ret Expr) {
var nCap Expr var nCap Expr
var nEltSize Expr var nEltSize Expr
var base Expr var base Expr
if low.IsNil() { var lowIsNil = low.IsNil()
if lowIsNil {
low = prog.IntVal(0, prog.Int()) low = prog.IntVal(0, prog.Int())
} }
switch t := x.raw.Type.Underlying().(type) { switch t := x.raw.Type.Underlying().(type) {
@@ -266,6 +267,9 @@ func (b Builder) Slice(x, low, high, max Expr) (ret Expr) {
nEltSize = SizeOf(prog, elem) nEltSize = SizeOf(prog, elem)
nCap = prog.IntVal(uint64(te.Len()), prog.Int()) nCap = prog.IntVal(uint64(te.Len()), prog.Int())
if high.IsNil() { if high.IsNil() {
if lowIsNil && max.IsNil() {
return b.unsafeSlice(x, nCap.impl, nCap.impl)
}
high = nCap high = nCap
} }
base = x base = x