fix(arm64): store-exclusive operand order and large-frame parity

Assisted-by: GLM 5.3
2026-09-20 00:38:24 +02:00
parent a6f3828c02
commit d315a998ce
6 changed files with 382 additions and 48 deletions
@@ -0,0 +1,69 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Large frames across every immediate band of the prologue SUB and the RET
+// epilogue, byte-parity-checked against go tool asm:
+//
+//   $5000     autosize 5024    one 16-bit chunk, materialised into REGTMP
+//   $65664    autosize 65680   split into two imm12 instructions
+//   $70000    autosize 70016   split into two imm12 instructions
+//   $65520    autosize 65536   one shifted imm12 in the prologue, a logical
+//                              immediate (ORR) in the non-leaf epilogue
+//   $16777232 autosize 16777248 wider than 24 bits, MOVZ/MOVK into REGTMP
+
+#include "textflag.h"
+
+TEXT ·leaf5000(SB), NOSPLIT, $5000-0
+	MOVD R0, R1
+	MOVD R1, R2
+	RET
+
+TEXT ·leaf65664(SB), NOSPLIT, $65664-0
+	MOVD R0, R1
+	MOVD R1, R2
+	RET
+
+TEXT ·leaf70000(SB), NOSPLIT, $70000-0
+	MOVD R0, R1
+	MOVD R1, R2
+	RET
+
+TEXT ·leaf65520(SB), NOSPLIT, $65520-0
+	MOVD R0, R1
+	MOVD R1, R2
+	MOVD R2, R3
+	MOVD R3, R4
+	RET
+
+TEXT ·nl5000(SB), NOSPLIT, $5000-0
+	MOVD R0, R1
+	MOVD R1, R2
+	CALL ·other(SB)
+	RET
+
+TEXT ·nl65664(SB), NOSPLIT, $65664-0
+	MOVD R0, R1
+	CALL ·other(SB)
+	RET
+
+TEXT ·nl70000(SB), NOSPLIT, $70000-0
+	MOVD R0, R1
+	CALL ·other(SB)
+	RET
+
+TEXT ·nl65520(SB), NOSPLIT, $65520-0
+	MOVD R0, R1
+	MOVD R1, R2
+	MOVD R2, R3
+	CALL ·other(SB)
+	RET
+
+TEXT ·nlhuge(SB), NOSPLIT, $16777232-0
+	CALL ·other(SB)
+	RET
+
+TEXT ·other(SB), NOSPLIT, $0-0
+	MOVD R0, R1
+	MOVD R1, R2
+	MOVD R2, R3
+	RET