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compiler: calculate max number of entries in slice at compile time

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This avoids difficult multiply-with-overflow code and avoids a multiply
at runtime.
This commit is contained in:
Ayke van Laethem
2019-02-07 17:37:22 +01:00
committed by Ron Evans
parent 26e7e93478
commit b837c94366
3 changed files with 39 additions and 28 deletions
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testdata/slice.go
Vendored
+26 -11
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@@ -13,17 +13,17 @@ func main() {
println("sum foo:", sum(foo))
// creating a slice with uncommon len, cap types
assert(len(make([]int, int(2), int(3))) == 2)
assert(len(make([]int, int8(2), int8(3))) == 2)
assert(len(make([]int, int16(2), int16(3))) == 2)
assert(len(make([]int, int32(2), int32(3))) == 2)
assert(len(make([]int, int64(2), int64(3))) == 2)
assert(len(make([]int, uint(2), uint(3))) == 2)
assert(len(make([]int, uint8(2), uint8(3))) == 2)
assert(len(make([]int, uint16(2), uint16(3))) == 2)
assert(len(make([]int, uint32(2), uint32(3))) == 2)
assert(len(make([]int, uint64(2), uint64(3))) == 2)
assert(len(make([]int, uintptr(2), uintptr(3))) == 2)
assert(len(make([]int, makeInt(2), makeInt(3))) == 2)
assert(len(make([]int, makeInt8(2), makeInt8(3))) == 2)
assert(len(make([]int, makeInt16(2), makeInt16(3))) == 2)
assert(len(make([]int, makeInt32(2), makeInt32(3))) == 2)
assert(len(make([]int, makeInt64(2), makeInt64(3))) == 2)
assert(len(make([]int, makeUint(2), makeUint(3))) == 2)
assert(len(make([]int, makeUint8(2), makeUint8(3))) == 2)
assert(len(make([]int, makeUint16(2), makeUint16(3))) == 2)
assert(len(make([]int, makeUint32(2), makeUint32(3))) == 2)
assert(len(make([]int, makeUint64(2), makeUint64(3))) == 2)
assert(len(make([]int, makeUintptr(2), makeUintptr(3))) == 2)
// indexing into a slice with uncommon index types
assert(foo[int(2)] == 4)
@@ -120,3 +120,18 @@ func assert(ok bool) {
panic("assert failed")
}
}
// Helper functions used to hide const values from the compiler during IR
// construction.
func makeInt(x int) int { return x }
func makeInt8(x int8) int8 { return x }
func makeInt16(x int16) int16 { return x }
func makeInt32(x int32) int32 { return x }
func makeInt64(x int64) int64 { return x }
func makeUint(x uint) uint { return x }
func makeUint8(x uint8) uint8 { return x }
func makeUint16(x uint16) uint16 { return x }
func makeUint32(x uint32) uint32 { return x }
func makeUint64(x uint64) uint64 { return x }
func makeUintptr(x uintptr) uintptr { return x }