tcg-ppc64: Implement bswap64 (68aebd45) · Commits · SUMMER2020 / students / proj-2021291

tcg/ppc64/tcg-target.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -1714,6 +1714,40 @@ static void tcg_out_op (TCGContext s, TCGOpcode opc, const TCGArg args,
		}
		break;

		case INDEX_op_bswap64_i64:
		a0 = args[0], a1 = args[1], a2 = 0;
		if (a0 == a1) {
		a0 = 0;
		a2 = a1;
		}

		/* a1 = # abcd efgh */
		/* a0 = rl32(a1, 8) # 0000 fghe */
		tcg_out_rlw(s, RLWINM, a0, a1, 8, 0, 31);
		/* a0 = dep(a0, rl32(a1, 24), 0xff000000) # 0000 hghe */
		tcg_out_rlw(s, RLWIMI, a0, a1, 24, 0, 7);
		/* a0 = dep(a0, rl32(a1, 24), 0x0000ff00) # 0000 hgfe */
		tcg_out_rlw(s, RLWIMI, a0, a1, 24, 16, 23);

		/* a0 = rl64(a0, 32) # hgfe 0000 */
		/* a2 = rl64(a1, 32) # efgh abcd */
		tcg_out_rld(s, RLDICL, a0, a0, 32, 0);
		tcg_out_rld(s, RLDICL, a2, a1, 32, 0);

		/* a0 = dep(a0, rl32(a2, 8), 0xffffffff) # hgfe bcda */
		tcg_out_rlw(s, RLWIMI, a0, a2, 8, 0, 31);
		/* a0 = dep(a0, rl32(a2, 24), 0xff000000) # hgfe dcda */
		tcg_out_rlw(s, RLWIMI, a0, a2, 24, 0, 7);
		/* a0 = dep(a0, rl32(a2, 24), 0x0000ff00) # hgfe dcba */
		tcg_out_rlw(s, RLWIMI, a0, a2, 24, 16, 23);

		if (a0 == 0) {
		tcg_out_mov(s, TCG_TYPE_I64, args[0], a0);
		/* Revert the source rotate that we performed above. */
		tcg_out_rld(s, RLDICL, a1, a1, 32, 0);
		}
		break;

		default:
		tcg_dump_ops (s);
		tcg_abort ();
		@@ -1823,6 +1857,7 @@ static const TCGTargetOpDef ppc_op_defs[] = {
		{ INDEX_op_bswap16_i64, { "r", "r" } },
		{ INDEX_op_bswap32_i32, { "r", "r" } },
		{ INDEX_op_bswap32_i64, { "r", "r" } },
		{ INDEX_op_bswap64_i64, { "r", "r" } },

		{ -1 },
		};

+1 −1