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ARM64: Prevent STP fusion for conditional code emitted by TBAR.

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Thanks to Peter Cawley. #1057
This commit is contained in:
Mike Pall 2023-08-28 22:39:35 +02:00
parent 0fa2f1cbcf
commit 7cc53f0b85
1 changed files with 2 additions and 1 deletions
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3
src/lj_asm_arm64.h
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@ -1289,8 +1289,9 @@ static void asm_tbar(ASMState *as, IRIns *ir)
Reg link = ra_scratch(as, rset_exclude(RSET_GPR, tab));
Reg mark = RID_TMP;
MCLabel l_end = emit_label(as);
emit_lso(as, A64I_STRx, link, tab, (int32_t)offsetof(GCtab, gclist));
emit_lso(as, A64I_STRB, mark, tab, (int32_t)offsetof(GCtab, marked));
/* Keep STRx in the middle to avoid LDP/STP fusion with surrounding code. */
emit_lso(as, A64I_STRx, link, tab, (int32_t)offsetof(GCtab, gclist));
emit_setgl(as, tab, gc.grayagain);
emit_dn(as, A64I_ANDw^emit_isk13(~LJ_GC_BLACK, 0), mark, mark);
emit_getgl(as, link, gc.grayagain);