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cmd/asm,cmd/compile,cmd/internal/obj/ppc64: add extswsli support on power9

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This adds support for the extswsli instruction which combines
extsw followed by a shift.

New benchmark demonstrates the improvement:
name      old time/op  new time/op  delta
ExtShift  1.34µs ± 0%  1.30µs ± 0%  -3.15%  (p=0.057 n=4+3)

Change-Id: I21b410676fdf15d20e0cbbaa75d7c6dcd3bbb7b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/257017
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <carlos.seo@gmail.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
This commit is contained in:
Lynn Boger
2020-09-23 11:06:39 -04:00
parent 874b3132a8
commit a424f6e45e
11 changed files with 142 additions and 42 deletions
src/cmd
asm
internal
asm
testdata
ppc64enc.s
compile
internal
gc
bench_test.go
ppc64
ssa.go
ssa
gen
PPC64.rulesPPC64Ops.go
opGen.gorewritePPC64.go
internal
obj
ppc64
a.out.goanames.goasm9.go
test/codegen
shift.go

7
test/codegen/shift.go

@ -182,7 +182,7 @@ func checkUnneededTrunc(tab *[100000]uint32, d uint64, v uint32, h uint16, b byt
return f, g
}
func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, v64 uint64) (uint8, uint16, uint32, uint64) {
func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, x32 int32, v64 uint64) (uint8, uint16, uint32, uint64, int64) {
// ppc64le:-"AND","CLRLSLWI"
// ppc64:-"AND","CLRLSLWI"
@ -202,7 +202,10 @@ func checkCombinedShifts(v8 uint8, v16 uint16, v32 uint32, v64 uint64) (uint8, u
// ppc64le:-"AND","CLRLSLDI"
// ppc64:-"AND","CLRLSLDI"
i := (v64 & 0xFFFFFFFF) << 5
return f, g, h, i
// ppc64le/power9:-"SLD","EXTSWSLI"
// ppc64/power9:-"SLD","EXTSWSLI"
j := int64(x32+32)*8
return f, g, h, i, j
}
func checkWidenAfterShift(v int64, u uint64) (int64, uint64) {