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cmd/compile/internal: generate ADDZE on PPC64

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This usage shows up in quite a few places, and helps reduce
register pressure in several complex cryto functions by
removing a MOVD $0,... instruction.

Change-Id: I9444ea8f9d19bfd68fb71ea8dc34e109681b3802
Reviewed-on: https://go-review.googlesource.com/c/go/+/571055
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
This commit is contained in:
Paul E. Murphy 2024-03-07 15:37:14 -06:00 • committed by Paul Murphy
parent 73cac61801
commit c7065bb9db
6 changed files with 52 additions and 0 deletions
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10
test/codegen/mathbits.go
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@ -516,6 +516,7 @@ func Add64R(x, y, ci uint64) uint64 {
r, _ := bits.Add64(x, y, ci)
return r
}
func Add64M(p, q, r *[3]uint64) {
var c uint64
r[0], c = bits.Add64(p[0], q[0], c)
@ -527,6 +528,15 @@ func Add64M(p, q, r *[3]uint64) {
r[2], c = bits.Add64(p[2], q[2], c)
}
func Add64M0(p, q, r *[3]uint64) {
var c uint64
r[0], c = bits.Add64(p[0], q[0], 0)
// ppc64x: -"ADDC", -"ADDE", "ADDZE\tR[1-9]"
r[1], c = bits.Add64(p[1], 0, c)
// ppc64x: -"ADDC", "ADDE", -"ADDZE"
r[2], c = bits.Add64(p[2], p[2], c)
}
func Add64MSaveC(p, q, r, c *[2]uint64) {
// ppc64x: "ADDC\tR", "ADDZE"
r[0], c[0] = bits.Add64(p[0], q[0], 0)