From: Cherry Mui <cherryyz@google.com>
Date: Wed, 22 Sep 2021 20:49:39 +0000 (-0400)
Subject: runtime: remove unnecessary argument stores for panicIndex etc. on ARM64
X-Git-Tag: go1.18beta1~670
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=5ec139fa78ac6ba3f0f715b6aa9235d36346a4a4;p=gostls13.git

runtime: remove unnecessary argument stores for panicIndex etc. on ARM64

If register ABI is used, no need to store the arguments to stack.
I forgot them in CL 323937.

Change-Id: I888af2b547a8fc97d13716bc8e8f3acd5c5bc127
Reviewed-on: https://go-review.googlesource.com/c/go/+/351609
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
---

diff --git a/src/runtime/asm_arm64.s b/src/runtime/asm_arm64.s
index 8cbd17fa75..9e9d9314ef 100644
--- a/src/runtime/asm_arm64.s
+++ b/src/runtime/asm_arm64.s
@@ -1383,12 +1383,16 @@ flush:
 // Defined as ABIInternal since the compiler generates ABIInternal
 // calls to it directly and it does not use the stack-based Go ABI.
 TEXT runtime·panicIndex<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicIndex<ABIInternal>(SB)
 TEXT runtime·panicIndexU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicIndexU<ABIInternal>(SB)
 TEXT runtime·panicSliceAlen<ABIInternal>(SB),NOSPLIT,$0-16
 #ifdef GOEXPERIMENT_regabiargs
@@ -1427,12 +1431,16 @@ TEXT runtime·panicSliceAcapU<ABIInternal>(SB),NOSPLIT,$0-16
 #endif
 	JMP	runtime·goPanicSliceAcapU<ABIInternal>(SB)
 TEXT runtime·panicSliceB<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicSliceB<ABIInternal>(SB)
 TEXT runtime·panicSliceBU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicSliceBU<ABIInternal>(SB)
 TEXT runtime·panicSlice3Alen<ABIInternal>(SB),NOSPLIT,$0-16
 #ifdef GOEXPERIMENT_regabiargs
@@ -1489,12 +1497,16 @@ TEXT runtime·panicSlice3BU<ABIInternal>(SB),NOSPLIT,$0-16
 #endif
 	JMP	runtime·goPanicSlice3BU<ABIInternal>(SB)
 TEXT runtime·panicSlice3C<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicSlice3C<ABIInternal>(SB)
 TEXT runtime·panicSlice3CU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
 	MOVD	R0, x+0(FP)
 	MOVD	R1, y+8(FP)
+#endif
 	JMP	runtime·goPanicSlice3CU<ABIInternal>(SB)
 TEXT runtime·panicSliceConvert<ABIInternal>(SB),NOSPLIT,$0-16
 #ifdef GOEXPERIMENT_regabiargs