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runtime: buffered write barrier for 386

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Updates #22460.

Change-Id: I3c8e90fd6bcda7e28911036591873d63665aaca7
Reviewed-on: https://go-review.googlesource.com/92696
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Austin Clements 2017-11-15 14:54:24 -08:00
parent de186c63ce
commit 252f1170e5
9 changed files with 124 additions and 3 deletions
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11
src/cmd/compile/internal/ssa/config.go
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@ -294,6 +294,17 @@ func NewConfig(arch string, types Types, ctxt *obj.Link, optimize bool) *Config
// runtime call clobber R12 on nacl
opcodeTable[OpARMCALLudiv].reg.clobbers |= 1 << 12 // R12
// Returns clobber BP on nacl/386, so the write
// barrier does.
opcodeTable[Op386LoweredWB].reg.clobbers |= 1 << 5 // BP
}
if ctxt.Flag_shared {
// LoweredWB is secretly a CALL and CALLs on 386 in
// shared mode get rewritten by obj6.go to go through
// the GOT, which clobbers BX.
opcodeTable[Op386LoweredWB].reg.clobbers |= 1 << 3 // BX
}
// cutoff is compared with product of numblocks and numvalues,