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cmd/compile: simplify keydup

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Use a type switch instead of calling Val.Ctype (which in turn just
uses a type switch anyway).

Use continue statements to simplify the control flow.

Change-Id: I65c139d706d4d78e5b4ce09d1b1505a3e424496b
Reviewed-on: https://go-review.googlesource.com/21173
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Matthew Dempsky 2016-03-25 18:07:19 -07:00
parent c61a55d831
commit d53287d0c3
2 changed files with 21 additions and 29 deletions
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1
src/cmd/compile/internal/gc/go.go
View File

@ -12,7 +12,6 @@ import (
const (
UINF = 100
PRIME1 = 3
BADWIDTH = -1000000000
MaxStackVarSize = 10 * 1024 * 1024
)

49
src/cmd/compile/internal/gc/typecheck.go
View File

@ -2782,27 +2782,26 @@ func keydup(n *Node, hash map[uint32][]*Node) {
return // we don't check variables
}
const PRIME1 = 3
var h uint32
switch n.Val().Ctype() {
switch v := n.Val().U.(type) {
default: // unknown, bool, nil
h = 23
case CTINT, CTRUNE:
h = uint32(n.Val().U.(*Mpint).Int64())
case *Mpint:
h = uint32(v.Int64())
case CTFLT:
d := n.Val().U.(*Mpflt).Float64()
x := math.Float64bits(d)
case *Mpflt:
x := math.Float64bits(v.Float64())
for i := 0; i < 8; i++ {
h = h*PRIME1 + uint32(x&0xFF)
x >>= 8
}
case CTSTR:
h = 0
s := n.Val().U.(string)
for i := 0; i < len(s); i++ {
h = h*PRIME1 + uint32(s[i])
case string:
for i := 0; i < len(v); i++ {
h = h*PRIME1 + uint32(v[i])
}
}
@ -2810,25 +2809,19 @@ func keydup(n *Node, hash map[uint32][]*Node) {
for _, a := range hash[h] {
cmp.Op = OEQ
cmp.Left = n
b := false
if a.Op == OCONVIFACE && orign.Op == OCONVIFACE {
if Eqtype(a.Left.Type, n.Type) {
cmp.Right = a.Left
evconst(&cmp)
if cmp.Op == OLITERAL {
// Sometimes evconst fails. See issue 12536.
b = cmp.Val().U.(bool)
}
}
} else if Eqtype(a.Type, n.Type) {
cmp.Right = a
evconst(&cmp)
if cmp.Op == OLITERAL {
b = cmp.Val().U.(bool)
}
a = a.Left
}
if b {
if !Eqtype(a.Type, n.Type) {
continue
}
cmp.Right = a
evconst(&cmp)
if cmp.Op != OLITERAL {
// Sometimes evconst fails. See issue 12536.
continue
}
if cmp.Val().U.(bool) {
Yyerror("duplicate key %v in map literal", n)
return
}