From b03b1acfb0bb6c605a70987dfaf5bb922c792e82 Mon Sep 17 00:00:00 2001
From: Jayanth Krishnamurthy <jayanth.krishnamurthy@ibm.com>
Date: Wed, 11 Sep 2024 09:58:04 -0500
Subject: [PATCH] cmd/internal/obj/ppc64: add double-decimal arithmetic
 instructions

Assembler support provided for the instructions DADD, DSUB, DMUL, and DDIV.

Change-Id: Ic12ba02ce453cb1ca275334ca1924fb2009da767
Reviewed-on: https://go-review.googlesource.com/c/go/+/620856
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
---
 src/cmd/asm/internal/asm/testdata/ppc64.s |  8 ++++++++
 src/cmd/internal/obj/ppc64/a.out.go       |  4 ++++
 src/cmd/internal/obj/ppc64/anames.go      |  4 ++++
 src/cmd/internal/obj/ppc64/asm9.go        | 13 +++++++++++++
 4 files changed, 29 insertions(+)

diff --git a/src/cmd/asm/internal/asm/testdata/ppc64.s b/src/cmd/asm/internal/asm/testdata/ppc64.s
index e2c1000e0b..e7ab944a1d 100644
--- a/src/cmd/asm/internal/asm/testdata/ppc64.s
+++ b/src/cmd/asm/internal/asm/testdata/ppc64.s
@@ -681,9 +681,13 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
 	FMOVDCC F1, F2                  // fc400891
 	FADDS F1, F2                    // ec42082a
 	FADDS F1, F2, F3                // ec62082a
+	DADD F1, F2                     // ec420804
+	DADD F1, F2, F3                 // ec620804
 	FADDSCC F1, F2, F3              // ec62082b
 	FSUB F1, F2                     // fc420828
 	FSUB F1, F2, F3                 // fc620828
+	DSUB F1, F2                     // ec420c04
+        DSUB F1, F2, F3                 // ec620c04
 	FSUBCC F1, F2, F3               // fc620829
 	FSUBS F1, F2                    // ec420828
 	FSUBS F1, F2, F3                // ec620828
@@ -691,12 +695,16 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
 	FSUBSCC F1, F2, F3              // ec620829
 	FMUL F1, F2                     // fc420072
 	FMUL F1, F2, F3                 // fc620072
+	DMUL F1, F2                     // ec420044
+        DMUL F1, F2, F3                 // ec620044
 	FMULCC F1, F2, F3               // fc620073
 	FMULS F1, F2                    // ec420072
 	FMULS F1, F2, F3                // ec620072
 	FMULSCC F1, F2, F3              // ec620073
 	FDIV F1, F2                     // fc420824
 	FDIV F1, F2, F3                 // fc620824
+	DDIV F1, F2                     // ec420c44
+        DDIV F1, F2, F3                 // ec620c44
 	FDIVCC F1, F2, F3               // fc620825
 	FDIVS F1, F2                    // ec420824
 	FDIVS F1, F2, F3                // ec620824
diff --git a/src/cmd/internal/obj/ppc64/a.out.go b/src/cmd/internal/obj/ppc64/a.out.go
index 3782af2918..137c6d2ff2 100644
--- a/src/cmd/internal/obj/ppc64/a.out.go
+++ b/src/cmd/internal/obj/ppc64/a.out.go
@@ -504,6 +504,8 @@ const (
 	ACROR
 	ACRORN
 	ACRXOR
+	ADADD
+	ADDIV
 	ADIVW
 	ADIVWCC
 	ADIVWVCC
@@ -512,6 +514,8 @@ const (
 	ADIVWUCC
 	ADIVWUVCC
 	ADIVWUV
+	ADMUL
+	ADSUB
 	AMODUD
 	AMODUW
 	AMODSD
diff --git a/src/cmd/internal/obj/ppc64/anames.go b/src/cmd/internal/obj/ppc64/anames.go
index 1cf41b8307..f9ec191551 100644
--- a/src/cmd/internal/obj/ppc64/anames.go
+++ b/src/cmd/internal/obj/ppc64/anames.go
@@ -57,6 +57,8 @@ var Anames = []string{
 	"CROR",
 	"CRORN",
 	"CRXOR",
+	"DADD",
+	"DDIV",
 	"DIVW",
 	"DIVWCC",
 	"DIVWVCC",
@@ -65,6 +67,8 @@ var Anames = []string{
 	"DIVWUCC",
 	"DIVWUVCC",
 	"DIVWUV",
+	"DMUL",
+	"DSUB",
 	"MODUD",
 	"MODUW",
 	"MODSD",
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 74f1772e3d..1a884dea7b 100644
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -1871,6 +1871,9 @@ func buildop(ctxt *obj.Link) {
 			opset(AFSUBS, r0)
 			opset(AFSUBCC, r0)
 			opset(AFSUBSCC, r0)
+			opset(ADADD, r0)
+			opset(ADDIV, r0)
+			opset(ADSUB, r0)
 
 		case AFMADD:
 			opset(AFMADDCC, r0)
@@ -1895,6 +1898,7 @@ func buildop(ctxt *obj.Link) {
 			opset(AFMULS, r0)
 			opset(AFMULCC, r0)
 			opset(AFMULSCC, r0)
+			opset(ADMUL, r0)
 
 		case AFCMPO:
 			opset(AFCMPU, r0)
@@ -3935,6 +3939,15 @@ func (c *ctxt9) oprrr(a obj.As) uint32 {
 	case ACRXOR:
 		return OPVCC(19, 193, 0, 0)
 
+	case ADADD:
+		return OPVCC(59, 2, 0, 0)
+	case ADDIV:
+		return OPVCC(59, 546, 0, 0)
+	case ADMUL:
+		return OPVCC(59, 34, 0, 0)
+	case ADSUB:
+		return OPVCC(59, 514, 0, 0)
+
 	case ADCBF:
 		return OPVCC(31, 86, 0, 0)
 	case ADCBI:
-- 
2.48.1