diff options
| -rw-r--r-- | tcg/s390/tcg-target.inc.c | 119 |
1 files changed, 43 insertions, 76 deletions
diff --git a/tcg/s390/tcg-target.inc.c b/tcg/s390/tcg-target.inc.c index 0de968fde2..38b9e791ee 100644 --- a/tcg/s390/tcg-target.inc.c +++ b/tcg/s390/tcg-target.inc.c @@ -1084,11 +1084,20 @@ static void tgen_setcond(TCGContext *s, TCGType type, TCGCond cond, have_loc = (s390_facilities & FACILITY_LOAD_ON_COND) != 0; - /* For HAVE_LOC, only the path through do_greater is smaller. */ + /* For HAVE_LOC, only the paths through GTU/GT/LEU/LE are smaller. */ + restart: switch (cond) { + case TCG_COND_NE: + /* X != 0 is X > 0. */ + if (c2const && c2 == 0) { + cond = TCG_COND_GTU; + } else { + break; + } + /* fallthru */ + 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); @@ -1096,49 +1105,33 @@ static void tgen_setcond(TCGContext *s, TCGType type, TCGCond cond, tcg_out_insn(s, RRE, ALCGR, dest, dest); return; - case TCG_COND_GEU: - if (have_loc) { - goto do_loc; - } - do_geu: - /* We need "real" carry semantics, so use SUBTRACT LOGICAL - instead of COMPARE LOGICAL. This may need an extra move. */ - if (c2const) { - tcg_out_mov(s, type, TCG_TMP0, c1); - 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 (s390_facilities & FACILITY_DISTINCT_OPS) { - if (type == TCG_TYPE_I32) { - tcg_out_insn(s, RRF, SLRK, TCG_TMP0, c1, c2); - } else { - tcg_out_insn(s, RRF, SLGRK, TCG_TMP0, c1, c2); - } + case TCG_COND_EQ: + /* X == 0 is X <= 0. */ + if (c2const && c2 == 0) { + cond = TCG_COND_LEU; } else { - tcg_out_mov(s, type, TCG_TMP0, c1); - if (type == TCG_TYPE_I32) { - tcg_out_insn(s, RR, SLR, TCG_TMP0, c2); - } else { - tcg_out_insn(s, RRE, SLGR, TCG_TMP0, c2); - } + break; } - tcg_out_movi(s, TCG_TYPE_I64, dest, 0); - tcg_out_insn(s, RRE, ALCGR, dest, dest); - return; + /* fallthru */ case TCG_COND_LEU: - if (have_loc) { - goto do_loc; - } - /* fallthru */ + case TCG_COND_LE: + /* As above, but we're looking for borrow, or !carry. + The second insn computes d - d - borrow, or -1 for true + and 0 for false. So we must mask to 1 bit afterward. */ + tgen_cmp(s, type, cond, c1, c2, c2const, true); + tcg_out_insn(s, RRE, SLBGR, dest, dest); + tgen_andi(s, type, dest, 1); + return; + + case TCG_COND_GEU: case TCG_COND_LTU: case TCG_COND_LT: - /* Swap operands so that we can use GEU/GTU/GT. */ + case TCG_COND_GE: + /* Swap operands so that we can use LEU/GTU/GT/LE. */ if (c2const) { if (have_loc) { - goto do_loc; + break; } tcg_out_movi(s, type, TCG_TMP0, c2); c2 = c1; @@ -1149,51 +1142,25 @@ static void tgen_setcond(TCGContext *s, TCGType type, TCGCond cond, 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: - if (have_loc) { - goto do_loc; - } - /* 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; + goto restart; default: - break; + g_assert_not_reached(); } cc = tgen_cmp(s, type, cond, c1, c2, c2const, false); - /* 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); - return; - - do_loc: - cc = tgen_cmp(s, type, cond, c1, c2, c2const, false); - /* 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); + if (have_loc) { + /* 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); + } } static void tgen_movcond(TCGContext *s, TCGType type, TCGCond c, TCGReg dest, |