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[dev.ssa] cmd/compile: add instrumentation to regalloc

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Change-Id: Ice206f7e94af4a148d9dd9a7570f5ed21722bedc
Reviewed-on: https://go-review.googlesource.com/14075
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Todd Neal 2015-08-30 21:39:25 -05:00
parent 451eca2293
commit cff0c6ad0f
1 changed files with 10 additions and 0 deletions
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10
src/cmd/compile/internal/ssa/regalloc.go
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@ -105,6 +105,7 @@ import (
)
const regDebug = false
const logSpills = false
// regalloc performs register allocation on f. It sets f.RegAlloc
// to the resulting allocation.
@ -402,6 +403,9 @@ func (s *regAllocState) allocValToReg(v *Value, mask regMask, nospill bool) *Val
// Instead, we regenerate the flags register by issuing the same instruction again.
// This requires (possibly) spilling and reloading that instruction's args.
case v.Type.IsFlags():
if logSpills {
fmt.Println("regalloc: regenerating flags")
}
ns := s.nospill
// Place v's arguments in registers, spilling and loading as needed
args := make([]*Value, 0, len(v.Args))
@ -429,9 +433,15 @@ func (s *regAllocState) allocValToReg(v *Value, mask regMask, nospill bool) *Val
// Load v from its spill location.
// TODO: rematerialize if we can.
case vi.spill2 != nil:
if logSpills {
fmt.Println("regallog: load spill2")
}
c = s.curBlock.NewValue1(v.Line, OpLoadReg, v.Type, vi.spill2)
vi.spill2used = true
case vi.spill != nil:
if logSpills {
fmt.Println("regalloc: load spill")
}
c = s.curBlock.NewValue1(v.Line, OpLoadReg, v.Type, vi.spill)
vi.spillUsed = true
default: