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cmd/compile: add support for arm64 bit-test instructions

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Add support for generating TBZ/TBNZ instructions.

The bit-test-and-branch pattern shows up in a number of
important places, including the runtime (gc bitmaps).

Before this change, there were 3 TB[N]?Z instructions in the Go tool,
all of which were in hand-written assembly. After this change, there
are 285. Also, the go1 benchmark binary gets about 4.5kB smaller.

Fixes #21361

Change-Id: I170c138b852754b9b8df149966ca5e62e6dfa771
Reviewed-on: https://go-review.googlesource.com/54470
Run-TryBot: Philip Hofer <phofer@umich.edu>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
philhofer 2017-08-09 05:01:26 +00:00 • committed by Cherry Zhang
parent 583a941d4e
commit c59b495963
15 changed files with 743 additions and 50 deletions
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10
src/cmd/compile/internal/ssa/gen/ARM64Ops.go
View file

@ -512,10 +512,12 @@ func init() {
{name: "ULE"},
{name: "UGT"},
{name: "UGE"},
{name: "Z"}, // Control == 0 (take a register instead of flags)
{name: "NZ"}, // Control != 0
{name: "ZW"}, // Control == 0, 32-bit
{name: "NZW"}, // Control != 0, 32-bit
{name: "Z"}, // Control == 0 (take a register instead of flags)
{name: "NZ"}, // Control != 0
{name: "ZW"}, // Control == 0, 32-bit
{name: "NZW"}, // Control != 0, 32-bit
{name: "TBZ"}, // Control & (1 << Aux.(int64)) == 0
{name: "TBNZ"}, // Control & (1 << Aux.(int64)) != 0
}
archs = append(archs, arch{