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cmd/compile/internal: optimizing add+sll rule using ALSLV instruction on loong64

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Reduce the number of go toolchain instructions on loong64 as follows:

	file	    before	after	    Δ 	     %
	go	    1573148	1571708	   -1,440  -0.0915%
	gofmt	    320578	320090	   -488    -0.1522%
	asm	    555066	554406	   -660    -0.1189%
	cgo	    481566	480926	   -640    -0.1329%
	compile	    2475962	2473880	   -2,082  -0.0841%
	cover	    516536	515920	   -616    -0.1193%
	link	    702172	701404	   -768    -0.1094%
	preprofile  238626	238274	   -352    -0.1475%
	vet	    792928	792100	   -828    -0.1044%

Change-Id: I61e462726835959c60e1b4e5256d4020202418ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/693877
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
This commit is contained in:
limeidan 2025-07-18 10:36:06 +08:00 • committed by Keith Randall
parent ea55ca3600
commit bd71b94659
3 changed files with 29 additions and 0 deletions
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5
test/codegen/arithmetic.go
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@ -624,6 +624,11 @@ func AddMul(x int) int {
return 2*x + 1
}
func AddShift(a, b int) int {
// loong64: "ALSLV"
return a + (b << 4)
}
func MULA(a, b, c uint32) (uint32, uint32, uint32) {
// arm:`MULA`,-`MUL\s`
// arm64:`MADDW`,-`MULW`