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[dev.ssa] cmd/compile: implement OSTRUCTLIT and OARRAYLIT

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The frontend rewrites most literals, so we see only zero
ones during SSA construction.  We can implement those
using the existing zeroing behavior.

Change-Id: I390ad1be0a4b6729baf0c8936c7610aae2aef049
Reviewed-on: https://go-review.googlesource.com/14754
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2015-09-18 22:12:38 -07:00
parent b32217a273
commit d3886906b1
1 changed files with 10 additions and 1 deletions
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11
src/cmd/compile/internal/gc/ssa.go
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@ -574,7 +574,16 @@ func (s *state) stmt(n *Node) {
}
var r *ssa.Value
if n.Right != nil {
r = s.expr(n.Right)
if n.Right.Op == OSTRUCTLIT || n.Right.Op == OARRAYLIT {
// All literals with nonzero fields have already been
// rewritten during walk. Any that remain are just T{}
// or equivalents. Leave r = nil to get zeroing behavior.
if !iszero(n.Right) {
Fatalf("literal with nonzero value in SSA: %v", n.Right)
}
} else {
r = s.expr(n.Right)
}
}
if n.Right != nil && n.Right.Op == OAPPEND {
// Yuck! The frontend gets rid of the write barrier, but we need it!