From 4ae6ab2bdfe3ebe8340d0d49fd2bb73f1a3e19ff Mon Sep 17 00:00:00 2001
From: Vishwanatha HD <Vishwanatha.HD@ibm.com>
Date: Mon, 10 Feb 2025 10:50:59 +0000
Subject: cmd/asm: add LCDBR instruction on s390x

This CL is to add LCDBR assembly instruction mnemonics, mainly used in math package.

The LCDBR instruction has the same effect as the FNEG pseudo-instructions, just that it sets the flag.

Change-Id: I3f00f1ed19148d074c3b6c5f64af0772289f2802
Reviewed-on: https://go-review.googlesource.com/c/go/+/648036
Reviewed-by: Srinivas Pokala <Pokala.Srinivas@ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Munday <mike.munday@lowrisc.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Munday <mike.munday@lowrisc.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 src/cmd/internal/obj/s390x/a.out.go  | 1 +
 src/cmd/internal/obj/s390x/anames.go | 1 +
 src/cmd/internal/obj/s390x/asmz.go   | 3 +++
 3 files changed, 5 insertions(+)

(limited to 'src/cmd/internal/obj')

diff --git a/src/cmd/internal/obj/s390x/a.out.go b/src/cmd/internal/obj/s390x/a.out.go
index 08ade51924..3eed4624b1 100644
--- a/src/cmd/internal/obj/s390x/a.out.go
+++ b/src/cmd/internal/obj/s390x/a.out.go
@@ -329,6 +329,7 @@ const (
 	AFNABS
 	AFNEG
 	AFNEGS
+	ALCDBR
 	ALEDBR
 	ALDEBR
 	ALPDFR
diff --git a/src/cmd/internal/obj/s390x/anames.go b/src/cmd/internal/obj/s390x/anames.go
index fa23984332..ae86d2092b 100644
--- a/src/cmd/internal/obj/s390x/anames.go
+++ b/src/cmd/internal/obj/s390x/anames.go
@@ -96,6 +96,7 @@ var Anames = []string{
 	"FNABS",
 	"FNEG",
 	"FNEGS",
+	"LCDBR",
 	"LEDBR",
 	"LDEBR",
 	"LPDFR",
diff --git a/src/cmd/internal/obj/s390x/asmz.go b/src/cmd/internal/obj/s390x/asmz.go
index 98dbc7c834..6511549eeb 100644
--- a/src/cmd/internal/obj/s390x/asmz.go
+++ b/src/cmd/internal/obj/s390x/asmz.go
@@ -969,6 +969,7 @@ func buildop(ctxt *obj.Link) {
 			opset(ALNDFR, r)
 			opset(AFNEG, r)
 			opset(AFNEGS, r)
+			opset(ALCDBR, r)
 			opset(ALEDBR, r)
 			opset(ALDEBR, r)
 			opset(AFSQRT, r)
@@ -3373,6 +3374,8 @@ func (c *ctxtz) asmout(p *obj.Prog, asm *[]byte) {
 			opcode = op_LCDFR
 		case AFNEGS:
 			opcode = op_LCEBR
+		case ALCDBR:
+			opcode = op_LCDBR
 		case ALEDBR:
 			opcode = op_LEDBR
 		case ALDEBR:
-- 
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