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[dev.ssa] cmd/compile: unify and check LoweredGetClosurePtr

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The comments were mostly duplicated; unify them.
Add a check that the required invariant holds.

Change-Id: I42fe09dcd1fac76d3c4e191f7a58c591c5ce429b
Reviewed-on: https://go-review.googlesource.com/24719
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Josh Bleecher Snyder 2016-07-03 13:40:03 -07:00
parent ad8b8f644e
commit 41a7dca272
3 changed files with 14 additions and 11 deletions
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7
src/cmd/compile/internal/amd64/ssa.go
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@ -720,11 +720,8 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
case ssa.OpArg:
// input args need no code
case ssa.OpAMD64LoweredGetClosurePtr:
// Output is hardwired to DX only,
// and DX contains the closure pointer on
// closure entry, and this "instruction"
// is scheduled to the very beginning
// of the entry block.
// Closure pointer is DX.
gc.CheckLoweredGetClosurePtr(v)
case ssa.OpAMD64LoweredGetG:
r := gc.SSARegNum(v)
// See the comments in cmd/internal/obj/x86/obj6.go