static void tgen_setcond(TCGContext *s, TCGType type, TCGCond cond, TCGReg dest, TCGReg c1, TCGArg c2, int c2const) { int cc; switch (cond) { case TCG_COND_GTU: case TCG_COND_GT: do_greater: /* The result of a compare has CC=2 for GT and CC=3 unused. ADD LOGICAL WITH CARRY considers (CC & 2) the carry bit. */ tgen_cmp(s, type, cond, c1, c2, c2const, true); tcg_out_movi(s, type, dest, 0); tcg_out_insn(s, RRE, ALCGR, dest, dest); return; case TCG_COND_GEU: do_geu: /* We need "real" carry semantics, so use SUBTRACT LOGICAL instead of COMPARE LOGICAL. This needs an extra move. */ tcg_out_mov(s, type, TCG_TMP0, c1); if (c2const) { tcg_out_movi(s, TCG_TYPE_I64, dest, 0); if (type == TCG_TYPE_I32) { tcg_out_insn(s, RIL, SLFI, TCG_TMP0, c2); } else { tcg_out_insn(s, RIL, SLGFI, TCG_TMP0, c2); } } else { if (type == TCG_TYPE_I32) { tcg_out_insn(s, RR, SLR, TCG_TMP0, c2); } else { tcg_out_insn(s, RRE, SLGR, TCG_TMP0, c2); } tcg_out_movi(s, TCG_TYPE_I64, dest, 0); } tcg_out_insn(s, RRE, ALCGR, dest, dest); return; case TCG_COND_LEU: case TCG_COND_LTU: case TCG_COND_LT: /* Swap operands so that we can use GEU/GTU/GT. */ if (c2const) { tcg_out_movi(s, type, TCG_TMP0, c2); c2 = c1; c2const = 0; c1 = TCG_TMP0; } else { TCGReg t = c1; c1 = c2; c2 = t; } if (cond == TCG_COND_LEU) { goto do_geu; } cond = tcg_swap_cond(cond); goto do_greater; case TCG_COND_NE: /* X != 0 is X > 0. */ if (c2const && c2 == 0) { cond = TCG_COND_GTU; goto do_greater; } break; case TCG_COND_EQ: /* X == 0 is X <= 0 is 0 >= X. */ if (c2const && c2 == 0) { tcg_out_movi(s, TCG_TYPE_I64, TCG_TMP0, 0); c2 = c1; c2const = 0; c1 = TCG_TMP0; goto do_geu; } break; default: break; } cc = tgen_cmp(s, type, cond, c1, c2, c2const, false); if (facilities & FACILITY_LOAD_ON_COND) { /* Emit: d = 0, t = 1, d = (cc ? t : d). */ tcg_out_movi(s, TCG_TYPE_I64, dest, 0); tcg_out_movi(s, TCG_TYPE_I64, TCG_TMP0, 1); tcg_out_insn(s, RRF, LOCGR, dest, TCG_TMP0, cc); } else { /* Emit: d = 1; if (cc) goto over; d = 0; over: */ tcg_out_movi(s, type, dest, 1); tcg_out_insn(s, RI, BRC, cc, (4 + 4) >> 1); tcg_out_movi(s, type, dest, 0); } }