cmd/compile/internal: reuse more memory

Reuse even more memory, and keep track of it in a long-lived debugState
object rather than piecemeal in the Cache.

Change-Id: Ib6936b4e8594dc6dda1f59ece753c00fd1c136ba
Reviewed-on: https://go-review.googlesource.com/92404
Reviewed-by: David Chase <drchase@google.com>

1 files changed, 1 insertions, 20 deletions

diff --git a/src/cmd/compile/internal/ssa/cache.go b/src/cmd/compile/internal/ssa/cache.go
index 299c804dd9..46edcc25d9 100644
--- a/src/cmd/compile/internal/ssa/cache.go
+++ b/src/cmd/compile/internal/ssa/cache.go
@@ -25,15 +25,7 @@ type Cache struct {
 	scrSparse     []*sparseSet // scratch sparse sets to be re-used.
 
 	ValueToProgAfter []*obj.Prog
-	blockDebug       []BlockDebug
-	valueNames       [][]SlotID
-	slotLocs         []VarLoc
-	regContents      [][]SlotID
-	pendingEntries   []pendingEntry
-	pendingSlotLocs  []VarLoc
-
-	liveSlotSliceBegin int
-	liveSlots          []liveSlot
+	debugState       debugState
 }
 
 func (c *Cache) Reset() {
@@ -53,16 +45,5 @@ func (c *Cache) Reset() {
 		xl[i] = nil
 	}
 
-	c.liveSlots = c.liveSlots[:0]
-	c.liveSlotSliceBegin = 0
-}
-
-func (c *Cache) AppendLiveSlot(ls liveSlot) {
-	c.liveSlots = append(c.liveSlots, ls)
 }
 
-func (c *Cache) GetLiveSlotSlice() []liveSlot {
-	s := c.liveSlots[c.liveSlotSliceBegin:]
-	c.liveSlotSliceBegin = len(c.liveSlots)
-	return s
-}