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[dev.ssa] cmd/compile/ssa: implement OLEN

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Change-Id: Ie23b13142fd820d7071a348a8370175e58b76d64
Reviewed-on: https://go-review.googlesource.com/11878
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-07-03 18:41:28 -07:00
parent 6c14059e65
commit cc3f031a31
1 changed files with 10 additions and 0 deletions
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10
src/cmd/compile/internal/gc/ssa.go
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@ -521,6 +521,16 @@ func (s *state) expr(n *Node) *ssa.Value {
return s.newValue2(ssa.OpLoad, n.Left.Type.Type, p, s.mem())
}
case OLEN:
switch {
case n.Left.Type.Bound < 0: // slice
return s.newValue1(ssa.OpSliceLen, s.config.Uintptr, s.expr(n.Left))
case n.Left.Type.IsString(): // string
return s.newValue1(ssa.OpStringLen, s.config.Uintptr, s.expr(n.Left))
default: // array
return s.constInt(s.config.Uintptr, n.Left.Type.Bound)
}
case OCALLFUNC:
static := n.Left.Op == ONAME && n.Left.Class == PFUNC