mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tcg/s390: Use slbgr for setcond le and leu

Browse Source 
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-07-25 23:09:17 -04:00 committed by Richard Henderson
parent 7af525af01
commit 4609190b5f
1 changed files with 44 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
tcg/s390/tcg-target.inc.c
View File

@ -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);
}
}
tcg_out_movi(s, TCG_TYPE_I64, dest, 0);
tcg_out_insn(s, RRE, ALCGR, dest, dest);
return;
case TCG_COND_LEU:
if (have_loc) {
goto do_loc;
break;
}
/* fallthru */
case TCG_COND_LEU:
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,