diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cmd/compile/internal/ssa/regalloc.go | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go index aac950a76b..e40fe17ad4 100644 --- a/src/cmd/compile/internal/ssa/regalloc.go +++ b/src/cmd/compile/internal/ssa/regalloc.go @@ -2227,6 +2227,7 @@ func (e *edgeState) findRegFor(typ Type) Location { // 1) an unused register // 2) a non-unique register not holding a final value // 3) a non-unique register + // 4) TODO: a register holding a rematerializeable value x := m &^ e.usedRegs if x != 0 { return &e.s.registers[pickReg(x)] @@ -2252,10 +2253,12 @@ func (e *edgeState) findRegFor(typ Type) Location { 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.Pos, OpStoreReg, c.Type, c) - e.set(t, vid, x, false, c.Pos) - if e.s.f.pass.debug > regDebug { - fmt.Printf(" SPILL %s->%s %s\n", r.Name(), t.Name(), x.LongString()) + if !c.rematerializeable() { + x := e.p.NewValue1(c.Pos, OpStoreReg, c.Type, c) + e.set(t, vid, x, false, c.Pos) + if e.s.f.pass.debug > regDebug { + fmt.Printf(" SPILL %s->%s %s\n", r.Name(), t.Name(), x.LongString()) + } } // r will now be overwritten by the caller. At some point // later, the newly saved value will be moved back to its |