From c7065bb9db1981b32d2f1c9ca1de7aae1f7d4a38 Mon Sep 17 00:00:00 2001
From: "Paul E. Murphy" <murp@ibm.com>
Date: Thu, 7 Mar 2024 15:37:14 -0600
Subject: cmd/compile/internal: generate ADDZE on PPC64

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>
---
 test/codegen/mathbits.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'test/codegen/mathbits.go')

diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go
index 184d608424..82a139acab 100644
--- a/test/codegen/mathbits.go
+++ b/test/codegen/mathbits.go
@@ -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)
-- 
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