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| author | eric fang <eric.fang@arm.com> | 2022-07-29 04:05:03 +0000 |
|---|---|---|
| committer | Eric Fang <eric.fang@arm.com> | 2022-08-10 02:13:53 +0000 |
| commit | efe5929dbd23054395ea128325edba8d23b6d5fc (patch) | |
| tree | 5085d9d0206273ab96162d39380b02b0510561de /src/plugin/plugin_test.go | |
| parent | 8dc7710faeda33b03fe32d4e7c800f0dcf27c698 (diff) | |
| download | go-efe5929dbd23054395ea128325edba8d23b6d5fc.tar.xz | |
cmd/compile/internal/ssa: optimize ARM64 code with TST
For signed comparisons, the following four optimization rules hold:
(CMPconst [0] z:(AND x y)) && z.Uses == 1 => (TST x y)
(CMPWconst [0] z:(AND x y)) && z.Uses == 1 => (TSTW x y)
(CMPconst [0] x:(ANDconst [c] y)) && x.Uses == 1 => (TSTconst [c] y)
(CMPWconst [0] x:(ANDconst [c] y)) && x.Uses == 1 => (TSTWconst [int32(c)] y)
But currently they only apply to jump instructions, not to conditional
instructions within a block, such as cset, csel, etc. This CL extends
the above rules into blocks so that conditional instructions can also be
optimized.
name old time/op new time/op delta
DivisiblePow2constI64-160 1.04ns ± 0% 0.86ns ± 0% -17.30% (p=0.008 n=5+5)
DivisiblePow2constI32-160 1.04ns ± 0% 0.87ns ± 0% -16.16% (p=0.016 n=4+5)
DivisiblePow2constI16-160 1.04ns ± 0% 0.87ns ± 0% -16.03% (p=0.008 n=5+5)
DivisiblePow2constI8-160 1.04ns ± 0% 0.86ns ± 0% -17.15% (p=0.008 n=5+5)
Change-Id: I6bc34bff30862210e8dd001e0340b8fe502fe3de
Reviewed-on: https://go-review.googlesource.com/c/go/+/420434
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Eric Fang <eric.fang@arm.com>
Diffstat (limited to 'src/plugin/plugin_test.go')
0 files changed, 0 insertions, 0 deletions