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cmd/compile: fold negation into addition/subtraction on loong64

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This change also avoid double negation, and add loong64 codegen for arithmetic tests.
Reduce the number of go toolchain instructions on loong64 as follows.

    file      before    after     Δ       %
    addr2line 279972    279896  -76    -0.0271%
    asm       556390    556310  -80    -0.0144%
    buildid   272376    272300  -76    -0.0279%
    cgo       481534    481550  +16    +0.0033%
    compile   2457992   2457396 -596   -0.0242%
    covdata   323488    323404  -84    -0.0260%
    cover     518630    518490  -140   -0.0270%
    dist      340894    340814  -80    -0.0235%
    distpack  282568    282484  -84    -0.0297%
    doc       790224    789984  -240   -0.0304%
    fix       324408    324348  -60    -0.0185%
    link      704910    704666  -244   -0.0346%
    nm        277220    277144  -76    -0.0274%
    objdump   508026    507878  -148   -0.0291%
    pack      221810    221786  -24    -0.0108%
    pprof     1470284   1469880 -404   -0.0275%
    test2json 254896    254852  -44    -0.0173%
    trace     1100390   1100074 -316   -0.0287%
    vet       781398    781142  -256   -0.0328%
    go        1529668   1529128 -540   -0.0353%
    gofmt     318668    318568  -100   -0.0314%
    total     13795746 13792094 -3652  -0.0265%

Change-Id: I88d1f12cfc4be0e92687c48e06a57213aa484aca
Reviewed-on: https://go-review.googlesource.com/c/go/+/672555
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Xiaolin Zhao 2025-05-14 14:35:41 +08:00 • committed by abner chenc
parent de86d02c32
commit c31a5c571f
4 changed files with 108 additions and 0 deletions
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5
src/cmd/compile/internal/ssa/rewrite.go
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@ -524,6 +524,11 @@ func isU8Bit(n int64) bool {
return n == int64(uint8(n))
}
// is12Bit reports whether n can be represented as a signed 12 bit integer.
func is12Bit(n int64) bool {
return -(1<<11) <= n && n < (1<<11)
}
// isU12Bit reports whether n can be represented as an unsigned 12 bit integer.
func isU12Bit(n int64) bool {
return 0 <= n && n < (1<<12)