mirror of
https://github.com/golang/go
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8c67f210a1
This change makes it easier to express instructions
with arbitrary number of operands.
Rationale: previous approach with operand "hiding" does
not scale well, AVX and especially AVX512 have many
instructions with 3+ operands.
x86 asm backend is updated to handle up to 6 explicit operands.
It also fixes issue with 4-th immediate operand type checks.
All `ytab` tables are updated accordingly.
Changes to non-x86 backends only include these patterns:
`p.From3 = X` => `p.SetFrom3(X)`
`p.From3.X = Y` => `p.GetFrom3().X = Y`
Over time, other backends can adapt Prog.RestArgs
and reduce the amount of workarounds.
-- Performance --
x/benchmark/build:
$ benchstat upstream.bench patched.bench
name old time/op new time/op delta
Build-48 21.7s ± 2% 21.8s ± 2% ~ (p=0.218 n=10+10)
name old binary-size new binary-size delta
Build-48 10.3M ± 0% 10.3M ± 0% ~ (all equal)
name old build-time/op new build-time/op delta
Build-48 21.7s ± 2% 21.8s ± 2% ~ (p=0.218 n=10+10)
name old build-peak-RSS-bytes new build-peak-RSS-bytes delta
Build-48 145MB ± 5% 148MB ± 5% ~ (p=0.218 n=10+10)
name old build-user+sys-time/op new build-user+sys-time/op delta
Build-48 21.0s ± 2% 21.2s ± 2% ~ (p=0.075 n=10+10)
Microbenchmark shows a slight slowdown.
name old time/op new time/op delta
AMD64asm-4 49.5ms ± 1% 49.9ms ± 1% +0.67% (p=0.001 n=23+15)
func BenchmarkAMD64asm(b *testing.B) {
for i := 0; i < b.N; i++ {
TestAMD64EndToEnd(nil)
TestAMD64Encoder(nil)
}
}
Change-Id: I4f1d37b5c2c966da3f2127705ccac9bff0038183
Reviewed-on: https://go-review.googlesource.com/63490
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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| .. | ||
| archive | ||
| bufio | ||
| builtin | ||
| bytes | ||
| cmd | ||
| compress | ||
| container | ||
| context | ||
| crypto | ||
| database/sql | ||
| debug | ||
| encoding | ||
| errors | ||
| expvar | ||
| flag | ||
| fmt | ||
| go | ||
| hash | ||
| html | ||
| image | ||
| index/suffixarray | ||
| internal | ||
| io | ||
| log | ||
| math | ||
| mime | ||
| net | ||
| os | ||
| path | ||
| plugin | ||
| reflect | ||
| regexp | ||
| runtime | ||
| sort | ||
| strconv | ||
| strings | ||
| sync | ||
| syscall | ||
| testing | ||
| text | ||
| time | ||
| unicode | ||
| unsafe | ||
| vendor/golang_org/x | ||
| all.bash | ||
| all.bat | ||
| all.rc | ||
| androidtest.bash | ||
| bootstrap.bash | ||
| buildall.bash | ||
| clean.bash | ||
| clean.bat | ||
| clean.rc | ||
| cmp.bash | ||
| iostest.bash | ||
| make.bash | ||
| make.bat | ||
| Make.dist | ||
| make.rc | ||
| naclmake.bash | ||
| nacltest.bash | ||
| race.bash | ||
| race.bat | ||
| run.bash | ||
| run.bat | ||
| run.rc | ||