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cmd/compile: implement non-constant rotates

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Makes math/bits.Rotate{Left,Right} fast on amd64.

name              old time/op  new time/op  delta
RotateLeft-12     7.42ns ± 6%  5.45ns ± 6%  -26.54%   (p=0.000 n=9+10)
RotateLeft8-12    4.77ns ± 5%  3.42ns ± 7%  -28.25%   (p=0.000 n=8+10)
RotateLeft16-12   4.82ns ± 8%  3.40ns ± 7%  -29.36%  (p=0.000 n=10+10)
RotateLeft32-12   4.87ns ± 7%  3.48ns ± 7%  -28.51%    (p=0.000 n=8+9)
RotateLeft64-12   5.23ns ±10%  3.35ns ± 6%  -35.97%   (p=0.000 n=9+10)
RotateRight-12    7.59ns ± 8%  5.71ns ± 1%  -24.72%   (p=0.000 n=10+8)
RotateRight8-12   4.98ns ± 7%  3.36ns ± 9%  -32.55%  (p=0.000 n=10+10)
RotateRight16-12  5.12ns ± 2%  3.45ns ± 5%  -32.62%  (p=0.000 n=10+10)
RotateRight32-12  4.80ns ± 6%  3.42ns ±16%  -28.68%  (p=0.000 n=10+10)
RotateRight64-12  4.78ns ± 6%  3.42ns ± 6%  -28.50%  (p=0.000 n=10+10)

Update #18940

Change-Id: Ie79fb5581c489ed4d3b859314c5e669a134c119b
Reviewed-on: https://go-review.googlesource.com/39711
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2017-03-29 10:04:17 -07:00
parent 38521004ed
commit 7e07e635f3
6 changed files with 5839 additions and 43 deletions
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8
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
View file

@ -284,6 +284,14 @@ func init() {
{name: "SARWconst", argLength: 1, reg: gp11, asm: "SARW", aux: "Int8", resultInArg0: true, clobberFlags: true}, // signed arg0 >> auxint, shift amount 0-15
{name: "SARBconst", argLength: 1, reg: gp11, asm: "SARB", aux: "Int8", resultInArg0: true, clobberFlags: true}, // signed arg0 >> auxint, shift amount 0-7
{name: "ROLQ", argLength: 2, reg: gp21shift, asm: "ROLQ", resultInArg0: true, clobberFlags: true}, // arg0 rotate left arg1 bits.
{name: "ROLL", argLength: 2, reg: gp21shift, asm: "ROLL", resultInArg0: true, clobberFlags: true}, // arg0 rotate left arg1 bits.
{name: "ROLW", argLength: 2, reg: gp21shift, asm: "ROLW", resultInArg0: true, clobberFlags: true}, // arg0 rotate left arg1 bits.
{name: "ROLB", argLength: 2, reg: gp21shift, asm: "ROLB", resultInArg0: true, clobberFlags: true}, // arg0 rotate left arg1 bits.
{name: "RORQ", argLength: 2, reg: gp21shift, asm: "RORQ", resultInArg0: true, clobberFlags: true}, // arg0 rotate right arg1 bits.
{name: "RORL", argLength: 2, reg: gp21shift, asm: "RORL", resultInArg0: true, clobberFlags: true}, // arg0 rotate right arg1 bits.
{name: "RORW", argLength: 2, reg: gp21shift, asm: "RORW", resultInArg0: true, clobberFlags: true}, // arg0 rotate right arg1 bits.
{name: "RORB", argLength: 2, reg: gp21shift, asm: "RORB", resultInArg0: true, clobberFlags: true}, // arg0 rotate right arg1 bits.
{name: "ROLQconst", argLength: 1, reg: gp11, asm: "ROLQ", aux: "Int8", resultInArg0: true, clobberFlags: true}, // arg0 rotate left auxint, rotate amount 0-63
{name: "ROLLconst", argLength: 1, reg: gp11, asm: "ROLL", aux: "Int8", resultInArg0: true, clobberFlags: true}, // arg0 rotate left auxint, rotate amount 0-31
{name: "ROLWconst", argLength: 1, reg: gp11, asm: "ROLW", aux: "Int8", resultInArg0: true, clobberFlags: true}, // arg0 rotate left auxint, rotate amount 0-15