From: Mike Pall <mike>
Date: Mon, 28 Aug 2023 20:33:54 +0000 (+0200)
Subject: ARM64: Fix LDP/STP fusing for unaligned accesses.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0fa2f1cbcf023ad0549f1428809e506fa2c78552;p=thirdparty%2FLuaJIT.git

ARM64: Fix LDP/STP fusing for unaligned accesses.

Thanks to Peter Cawley. #1056
---

diff --git a/src/lj_emit_arm64.h b/src/lj_emit_arm64.h
index 52d010b8..6926c71a 100644
--- a/src/lj_emit_arm64.h
+++ b/src/lj_emit_arm64.h
@@ -142,7 +142,7 @@ static void emit_lso(ASMState *as, A64Ins ai, Reg rd, Reg rn, int64_t ofs)
     } else {
       goto nopair;
     }
-    if (ofsm >= (int)((unsigned int)-64<<sc) && ofsm <= (63<<sc)) {
+    if (lj_ror((unsigned int)ofsm + (64u<<sc), sc) <= 127u) {
       *as->mcp = aip | A64F_N(rn) | (((ofsm >> sc) & 0x7f) << 15) |
 	(ai ^ ((ai == A64I_LDRx || ai == A64I_STRx) ? 0x50000000 : 0x90000000));
       return;