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String buffers, part 3c: Add IRBUFHDR_WRITE mode.

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Sponsored by fmad.io.
This commit is contained in:
Mike Pall
2021-07-19 16:41:29 +02:00
parent 1d5ef35fed
commit 02bcbea8b0
14 changed files with 112 additions and 5 deletions
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24
src/lj_asm_arm.h
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@@ -501,6 +501,30 @@ static void asm_retf(ASMState *as, IRIns *ir)
emit_lso(as, ARMI_LDR, RID_TMP, base, -4);
}
/* -- Buffer operations --------------------------------------------------- */
#if LJ_HASBUFFER
static void asm_bufhdr_write(ASMState *as, Reg sb)
{
Reg tmp = ra_scratch(as, rset_exclude(RSET_GPR, sb));
IRIns irgc;
int32_t addr = i32ptr((void *)&J2G(as->J)->cur_L);
irgc.ot = IRT(0, IRT_PGC); /* GC type. */
emit_storeofs(as, &irgc, RID_TMP, sb, offsetof(SBuf, L));
if ((as->flags & JIT_F_ARMV6T2)) {
emit_dnm(as, ARMI_BFI, RID_TMP, lj_fls(SBUF_MASK_FLAG), tmp);
} else {
emit_dnm(as, ARMI_ORR, RID_TMP, RID_TMP, tmp);
emit_dn(as, ARMI_AND|ARMI_K12|SBUF_MASK_FLAG, tmp, tmp);
}
emit_lso(as, ARMI_LDR, RID_TMP,
ra_allock(as, (addr & ~4095),
rset_exclude(rset_exclude(RSET_GPR, sb), tmp)),
(addr & 4095));
emit_loadofs(as, &irgc, tmp, sb, offsetof(SBuf, L));
}
#endif
/* -- Type conversions ---------------------------------------------------- */
#if !LJ_SOFTFP