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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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15
src/lj_asm_x86.h
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@@ -791,6 +791,21 @@ static void asm_retf(ASMState *as, IRIns *ir)
#endif
}
/* -- 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;
irgc.ot = IRT(0, IRT_PGC); /* GC type. */
emit_storeofs(as, &irgc, tmp, sb, offsetof(SBuf, L));
emit_opgl(as, XO_ARITH(XOg_OR), tmp|REX_GC64, cur_L);
emit_gri(as, XG_ARITHi(XOg_AND), tmp, SBUF_MASK_FLAG);
emit_loadofs(as, &irgc, tmp, sb, offsetof(SBuf, L));
}
#endif
/* -- Type conversions ---------------------------------------------------- */
static void asm_tointg(ASMState *as, IRIns *ir, Reg left)