From: limeidan <limeidan@loongson.cn>
Date: Sat, 6 Jan 2024 09:26:37 +0000 (+0800)
Subject: cmd/internal/obj/loong64: fixed operand assignment error for BFPT/BFPF instructions
X-Git-Tag: go1.24rc1~1349
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=ff0c2d96348fd86f77ecf6868dc1a0f09e35ff90;p=gostls13.git

cmd/internal/obj/loong64: fixed operand assignment error for BFPT/BFPF instructions

The BFPT correspond to BCNEZ instruction of LoongArch64 which structure
is:
	| op-p1 | offs[15:0] | op-p2 | cj | offs[20:16] |
The register REG_FCC0 should be assigned to the source operand cj which named rj here.

Change-Id: I696d0a46028924da1cd7e240fbb40a1913f1a757
Reviewed-on: https://go-review.googlesource.com/c/go/+/565620
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: abner chenc <chenguoqi@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Qiqi Huang <huangqiqi@loongson.cn>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: sophie zhao <zhaoxiaolin@loongson.cn>
---

diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 6d21767645..749db66421 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -1373,7 +1373,7 @@ func (c *ctxt0) asmout(p *obj.Prog, o *Optab, out []uint32) {
 			width = 21
 			// FCC0 is the implicit source operand, now that we
 			// don't register-allocate from the FCC bank.
-			rd = REG_FCC0
+			rj = REG_FCC0
 		case ABEQ, ABNE:
 			if rd == 0 || rd == REGZERO || rj == REGZERO {
 				// BEQZ/BNEZ can be encoded with 21-bit offsets.