From: Paul E. Murphy <murp@ibm.com>
Date: Thu, 26 Oct 2023 16:29:23 +0000 (-0500)
Subject: cmd/internal/obj/ppc64: remove unused C_XER optab class
X-Git-Tag: go1.22rc1~272
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e5ce93d7bfb7baead0671ad59bcd91ecb090a656;p=gostls13.git

cmd/internal/obj/ppc64: remove unused C_XER optab class

This halves the size of the xcmp lookup table.

Change-Id: I543fb72709ca45c026e9b7d8084a78f2a8fcd43e
Reviewed-on: https://go-review.googlesource.com/c/go/+/542295
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: Jayanth Krishnamurthy <jayanth.krishnamurthy@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
---

diff --git a/src/cmd/internal/obj/ppc64/a.out.go b/src/cmd/internal/obj/ppc64/a.out.go
index 83ec76e0f1..13143f5beb 100644
--- a/src/cmd/internal/obj/ppc64/a.out.go
+++ b/src/cmd/internal/obj/ppc64/a.out.go
@@ -436,7 +436,6 @@ const (
 	C_LOREG    /* An $n+reg memory arg where n is a 32 bit signed offset */
 	C_XOREG    /* An reg+reg memory arg */
 	C_FPSCR    /* The fpscr register */
-	C_XER      /* The xer, holds the carry bit */
 	C_LR       /* The link register */
 	C_CTR      /* The count register */
 	C_ANY      /* Any argument */
diff --git a/src/cmd/internal/obj/ppc64/anames9.go b/src/cmd/internal/obj/ppc64/anames9.go
index 0180358388..72d1f4915d 100644
--- a/src/cmd/internal/obj/ppc64/anames9.go
+++ b/src/cmd/internal/obj/ppc64/anames9.go
@@ -41,7 +41,6 @@ var cnames9 = []string{
 	"LOREG",
 	"XOREG",
 	"FPSCR",
-	"XER",
 	"LR",
 	"CTR",
 	"ANY",
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 9524f66ca4..4003e4af1e 100644
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -892,9 +892,6 @@ func (c *ctxt9) aclassreg(reg int16) int {
 		case REG_LR:
 			return C_LR
 
-		case REG_XER:
-			return C_XER
-
 		case REG_CTR:
 			return C_CTR
 		}
@@ -1153,7 +1150,7 @@ func cmp(a int, b int) bool {
 	switch a {
 
 	case C_SPR:
-		if b == C_LR || b == C_XER || b == C_CTR {
+		if b == C_LR || b == C_CTR {
 			return true
 		}
 
diff --git a/src/cmd/internal/obj/ppc64/asm_test.go b/src/cmd/internal/obj/ppc64/asm_test.go
index ed430edd91..7167a6a947 100644
--- a/src/cmd/internal/obj/ppc64/asm_test.go
+++ b/src/cmd/internal/obj/ppc64/asm_test.go
@@ -465,7 +465,6 @@ func TestAddrClassifier(t *testing.T) {
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_CR1}, C_CREG},
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_CR1SO}, C_CRBIT},
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_SPR0}, C_SPR},
-		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_SPR0 + 1}, C_XER},
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_SPR0 + 8}, C_LR},
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_SPR0 + 9}, C_CTR},
 		{obj.Addr{Type: obj.TYPE_REG, Reg: REG_FPSCR}, C_FPSCR},