diff options
Diffstat (limited to 'src/cmd/compile/internal/amd64')
| -rw-r--r-- | src/cmd/compile/internal/amd64/galign.go | 1 | ||||
| -rw-r--r-- | src/cmd/compile/internal/amd64/ggen.go | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/amd64/galign.go b/src/cmd/compile/internal/amd64/galign.go index bb3830bca5..6fd7f31617 100644 --- a/src/cmd/compile/internal/amd64/galign.go +++ b/src/cmd/compile/internal/amd64/galign.go @@ -27,4 +27,5 @@ func Init() { gc.Thearch.SSAMarkMoves = ssaMarkMoves gc.Thearch.SSAGenValue = ssaGenValue gc.Thearch.SSAGenBlock = ssaGenBlock + gc.Thearch.ZeroAuto = zeroAuto } diff --git a/src/cmd/compile/internal/amd64/ggen.go b/src/cmd/compile/internal/amd64/ggen.go index c137b52d80..d12153383e 100644 --- a/src/cmd/compile/internal/amd64/ggen.go +++ b/src/cmd/compile/internal/amd64/ggen.go @@ -166,6 +166,27 @@ func zerorange(p *obj.Prog, frame int64, lo int64, hi int64, ax *uint32, x0 *uin return p } +func zeroAuto(n *gc.Node, pp *obj.Prog) { + // Note: this code must not clobber any registers. + op := x86.AMOVQ + if gc.Widthptr == 4 { + op = x86.AMOVL + } + sym := gc.Linksym(n.Sym) + size := n.Type.Size() + for i := int64(0); i < size; i += int64(gc.Widthptr) { + p := gc.AddAsmAfter(op, pp) + pp = p + p.From.Type = obj.TYPE_CONST + p.From.Offset = 0 + p.To.Type = obj.TYPE_MEM + p.To.Name = obj.NAME_AUTO + p.To.Reg = x86.REG_SP + p.To.Offset = n.Xoffset + i + p.To.Sym = sym + } +} + func ginsnop() { // This is actually not the x86 NOP anymore, // but at the point where it gets used, AX is dead |