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cmd/compile: make compilation deterministic, fixes toolstash

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Make sure we don't depend on map iterator order.

Fixes #14600

Change-Id: Iac0e0c8689f3ace7a4dc8e2127e2fd3c8545bd29
Reviewed-on: https://go-review.googlesource.com/20158
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2016-03-03 09:53:03 -08:00
parent c03ed491fe
commit 686fbdb3b0
2 changed files with 16 additions and 8 deletions
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20
src/cmd/compile/internal/ssa/regalloc.go
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@ -1161,7 +1161,8 @@ type edgeState struct {
p, b *Block // edge goes from p->b.
// for each pre-regalloc value, a list of equivalent cached values
cache map[ID][]*Value
cache map[ID][]*Value
cachedVals []ID // (superset of) keys of the above map, for deterministic iteration
// map from location to the value it contains
contents map[Location]contentRecord
@ -1194,9 +1195,10 @@ func (e *edgeState) setup(idx int, srcReg []endReg, dstReg []startReg, stacklive
}
// Clear state.
for k := range e.cache {
delete(e.cache, k)
for _, vid := range e.cachedVals {
delete(e.cache, vid)
}
e.cachedVals = e.cachedVals[:0]
for k := range e.contents {
delete(e.contents, k)
}
@ -1234,7 +1236,8 @@ func (e *edgeState) setup(idx int, srcReg []endReg, dstReg []startReg, stacklive
e.destinations = dsts
if regDebug {
for vid, a := range e.cache {
for _, vid := range e.cachedVals {
a := e.cache[vid]
for _, c := range a {
fmt.Printf("src %s: v%d cache=%s\n", e.s.f.getHome(c.ID).Name(), vid, c)
}
@ -1423,6 +1426,9 @@ func (e *edgeState) set(loc Location, vid ID, c *Value, final bool) {
e.erase(loc)
e.contents[loc] = contentRecord{vid, c, final}
a := e.cache[vid]
if len(a) == 0 {
e.cachedVals = append(e.cachedVals, vid)
}
a = append(a, c)
e.cache[vid] = a
if r, ok := loc.(*Register); ok {
@ -1522,7 +1528,8 @@ func (e *edgeState) findRegFor(typ Type) Location {
// TODO: reuse these slots.
// Pick a register to spill.
for vid, a := range e.cache {
for _, vid := range e.cachedVals {
a := e.cache[vid]
for _, c := range a {
if r, ok := e.s.f.getHome(c.ID).(*Register); ok && m>>uint(r.Num)&1 != 0 {
x := e.p.NewValue1(c.Line, OpStoreReg, c.Type, c)
@ -1539,7 +1546,8 @@ func (e *edgeState) findRegFor(typ Type) Location {
}
fmt.Printf("m:%d unique:%d final:%d\n", m, e.uniqueRegs, e.finalRegs)
for vid, a := range e.cache {
for _, vid := range e.cachedVals {
a := e.cache[vid]
for _, c := range a {
fmt.Printf("v%d: %s %s\n", vid, c, e.s.f.getHome(c.ID).Name())
}