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cmd/compile/internal/ssa: lower builtins much later

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* Move lowering into a separate pass.
* SliceLen/SliceCap is now available to various intermediate passes
which use useful for bounds checking.
* Add a second opt pass to handle the new opportunities

Decreases the code size of binaries in pkg/tool/linux_amd64
by ~45K.

Updates #14564 #14606

Change-Id: I5b2bd6202181c50623a3585fbf15c0d6db6d4685
Reviewed-on: https://go-review.googlesource.com/20172
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Alexandru Moșoi 2016-03-03 11:13:43 +01:00 • committed by Alexandru Moșoi
parent aa3650f019
commit dfcb853d9d
7 changed files with 198 additions and 35 deletions
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2
src/cmd/compile/internal/ssa/compile.go
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@ -182,6 +182,8 @@ var passes = [...]pass{
{name: "phiopt", fn: phiopt},
{name: "nilcheckelim", fn: nilcheckelim},
{name: "prove", fn: prove},
{name: "dec", fn: dec, required: true},
{name: "late opt", fn: opt}, // TODO: split required rules and optimizing rules
{name: "generic deadcode", fn: deadcode},
{name: "fuse", fn: fuse},
{name: "dse", fn: dse},