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cmd/compile: layout stack frame during SSA

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Identify live stack variables during SSA and compute the stack frame
layout earlier so that we can emit instructions with the correct
offsets upfront.

Passes toolstash/buildall.

Change-Id: I191100dba274f1e364a15bdcfdc1d1466cdd1db5
Reviewed-on: https://go-review.googlesource.com/30216
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Matthew Dempsky 2016-10-03 12:26:25 -07:00
parent f239196b9e
commit 8c24bff52b
17 changed files with 160 additions and 319 deletions
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5
src/cmd/compile/internal/ssa/compile.go
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@ -278,7 +278,8 @@ var passes = [...]pass{
{name: "late nilcheck", fn: nilcheckelim2},
{name: "flagalloc", fn: flagalloc, required: true}, // allocate flags register
{name: "regalloc", fn: regalloc, required: true}, // allocate int & float registers + stack slots
{name: "trim", fn: trim}, // remove empty blocks
{name: "stackframe", fn: stackframe, required: true},
{name: "trim", fn: trim}, // remove empty blocks
}
// Double-check phase ordering constraints.
@ -329,6 +330,8 @@ var passOrder = [...]constraint{
{"schedule", "flagalloc"},
// regalloc needs flags to be allocated first.
{"flagalloc", "regalloc"},
// stackframe needs to know about spilled registers.
{"regalloc", "stackframe"},
// trim needs regalloc to be done first.
{"regalloc", "trim"},
}