commit fd9612d65662a448d6517cdcca24a14a79968813
parent 77b9f54738f53fb05a9913120a378732faadc4e9
Author: Andrew Alderwick <andrew@alderwick.co.uk>
Date: Wed, 12 May 2021 18:42:24 +0100
Implemented keep opcode flag
Diffstat:
3 files changed, 75 insertions(+), 72 deletions(-)
diff --git a/projects/demos/piano.usm b/projects/demos/piano.usm
@@ -108,7 +108,7 @@ BRK
OVR #10 SWP - .Audio0/output DEI #04 SFT < .Screen/color DEO
.Screen/y DEI2 #0002 ++ .Screen/y DEO2
( incr ) SWP #01 + SWP
- DUP2 < ,&loop JCN
+ LTHk ,&loop JCN
POP2
BRK
@@ -310,7 +310,7 @@ RTN
DUP2 #0018 ++
&loop
( move ) OVR2 .Screen/y DEO2
- ( draw ) DUPr STHr .Screen/color DEO
+ ( draw ) STHrk .Screen/color DEO
( incr ) .Screen/addr DEI2 #0008 ++ .Screen/addr DEO2
( incr ) SWP2 #0008 ++ SWP2
OVR2 OVR2 << ,&loop JCN
@@ -371,7 +371,7 @@ RTN
.Screen/x DEI2 #0001 ++ .Screen/x DEO2
( draw ) OVR .Audio0/length DEI2 SWP POP > #02 * #01 + .Screen/color DEO
( incr ) SWP #01 + SWP
- DUP2 < ,&loop JCN
+ LTHk ,&loop JCN
POP2
( range )
@@ -390,7 +390,7 @@ RTN
.wave-view/y1 LDZ2 DUP2 #0020 ++
&loop
OVR2 .Screen/y DEO2
- ( draw ) DUPr STHr .Screen/color DEO
+ ( draw ) STHrk .Screen/color DEO
( incr ) SWP2 #0001 ++ SWP2
OVR2 OVR2 << ,&loop JCN
POP2 POP2
@@ -414,9 +414,9 @@ RTN
( draw ) #21 .Screen/color DEO
.Screen/x DEI2 #0004 ++ .Screen/x DEO2
.Screen/y DEI2 #0008 ++ .Screen/y DEO2
- ;font-hex #00 DUPr STHr #08 * ++ .Screen/addr DEO2
+ ;font-hex #00 STHrk #08 * ++ .Screen/addr DEO2
( draw ) #21 .Screen/color DEO
- .Screen/x DEI2 #0004 -- #00 #00 DUPr STHr ;knob-offsetx ++ LDA ++ .Screen/x DEO2
+ .Screen/x DEI2 #0004 -- #00 #00 STHrk ;knob-offsetx ++ LDA ++ .Screen/x DEO2
.Screen/y DEI2 #0010 -- #00 #00 STHr ;knob-offsety ++ LDA ++ .Screen/y DEO2
;knob-icns #0020 ++ .Screen/addr DEO2
( draw ) #25 .Screen/color DEO
@@ -427,13 +427,13 @@ RTN
STH SWP
DUP #04 SFT TOS #0008 ** ;font-hex ++ .Screen/addr DEO2
- ( draw ) DUPr STHr .Screen/color DEO
+ ( draw ) STHrk .Screen/color DEO
#0f AND TOS #0008 ** ;font-hex ++ .Screen/addr DEO2
.Screen/x DEI2 #0008 ++ .Screen/x DEO2
- ( draw ) DUPr STHr .Screen/color DEO
+ ( draw ) STHrk .Screen/color DEO
DUP #04 SFT TOS #0008 ** ;font-hex ++ .Screen/addr DEO2
.Screen/x DEI2 #0008 ++ .Screen/x DEO2
- ( draw ) DUPr STHr .Screen/color DEO
+ ( draw ) STHrk .Screen/color DEO
#0f AND TOS #0008 ** ;font-hex ++ .Screen/addr DEO2
.Screen/x DEI2 #0008 ++ .Screen/x DEO2
( draw ) STHr .Screen/color DEO
diff --git a/src/assembler.c b/src/assembler.c
@@ -119,6 +119,8 @@ findopcode(char *s)
i |= (1 << 5); /* mode: short */
else if(s[3 + m] == 'r')
i |= (1 << 6); /* mode: return */
+ else if(s[3 + m] == 'k')
+ i |= (1 << 7); /* mode: keep */
else
return 0; /* failed to match */
m++;
diff --git a/src/uxn.c b/src/uxn.c
@@ -17,15 +17,15 @@ WITH REGARD TO THIS SOFTWARE.
/* clang-format off */
void push8(Stack *s, Uint8 a) { if (s->ptr == 0xff) { s->error = 2; return; } s->dat[s->ptr++] = a; }
-Uint8 pop8(Stack *s) { if (s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; }
-Uint8 peek8(Stack *s, Uint8 a) { if (s->ptr < a + 1) s->error = 1; return s->dat[s->ptr - a - 1]; }
+Uint8 pop8_keep(Stack *s, Uint8 a) { if (s->ptr < a + 1) s->error = 1; return s->dat[s->ptr - a - 1]; }
+Uint8 pop8_nokeep(Stack *s, Uint8 a) { if (s->ptr == 0) { s->error = 1; return 0; } return s->dat[--s->ptr]; (void) a; }
+static Uint8 (*pop8)(Stack *s, Uint8 a);
void mempoke8(Uint8 *m, Uint16 a, Uint8 b) { m[a] = b; }
Uint8 mempeek8(Uint8 *m, Uint16 a) { return m[a]; }
void devpoke8(Device *d, Uint8 a, Uint8 b) { d->dat[a & 0xf] = b; d->talk(d, a & 0x0f, 1); }
Uint8 devpeek8(Device *d, Uint8 a) { d->talk(d, a & 0x0f, 0); return d->dat[a & 0xf]; }
void push16(Stack *s, Uint16 a) { push8(s, a >> 8); push8(s, a); }
-Uint16 pop16(Stack *s) { return pop8(s) + (pop8(s) << 8); }
-Uint16 peek16(Stack *s, Uint8 a) { return peek8(s, a * 2) + (peek8(s, a * 2 + 1) << 8); }
+Uint16 pop16(Stack *s, Uint8 a) { return pop8(s, a * 2) + (pop8(s, a * 2 + 1) << 8); }
void mempoke16(Uint8 *m, Uint16 a, Uint16 b) { mempoke8(m, a, b >> 8); mempoke8(m, a + 1, b); }
Uint16 mempeek16(Uint8 *m, Uint16 a) { return (mempeek8(m, a) << 8) + mempeek8(m, a + 1); }
void devpoke16(Device *d, Uint8 a, Uint16 b) { devpoke8(d, a, b >> 8); devpoke8(d, a + 1, b); }
@@ -34,72 +34,72 @@ Uint16 devpeek16(Device *d, Uint16 a) { return (devpeek8(d, a) << 8) + devpeek8(
void op_brk(Uxn *u) { u->ram.ptr = 0; }
void op_nop(Uxn *u) { (void)u; }
void op_lit(Uxn *u) { push8(u->src, mempeek8(u->ram.dat, u->ram.ptr++)); }
-void op_pop(Uxn *u) { pop8(u->src); }
-void op_dup(Uxn *u) { push8(u->src, peek8(u->src, 0)); }
-void op_swp(Uxn *u) { Uint8 b = pop8(u->src), a = pop8(u->src); push8(u->src, b); push8(u->src, a); }
-void op_ovr(Uxn *u) { push8(u->src, peek8(u->src, 1)); }
-void op_rot(Uxn *u) { Uint8 c = pop8(u->src), b = pop8(u->src), a = pop8(u->src); push8(u->src, b); push8(u->src, c); push8(u->src, a); }
+void op_pop(Uxn *u) { pop8(u->src, 0); }
+void op_dup(Uxn *u) { Uint8 a = pop8(u->src, 0); push8(u->src, a); push8(u->src, a); }
+void op_swp(Uxn *u) { Uint8 b = pop8(u->src, 0), a = pop8(u->src, 1); push8(u->src, b); push8(u->src, a); }
+void op_ovr(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b); push8(u->src, a); push8(u->src, b); }
+void op_rot(Uxn *u) { Uint8 c = pop8(u->src, 0), b = pop8(u->src, 1), a = pop8(u->src, 2); push8(u->src, b); push8(u->src, c); push8(u->src, a); }
/* Logic */
-void op_equ(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b == a); }
-void op_neq(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b != a); }
-void op_gth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b > a); }
-void op_lth(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b < a); }
-void op_jmp(Uxn *u) { Uint8 a = pop8(u->src); u->ram.ptr += (Sint8)a; }
-void op_jnz(Uxn *u) { Uint8 a = pop8(u->src); if (pop8(u->src)) u->ram.ptr += (Sint8)a; }
-void op_jsr(Uxn *u) { Uint8 a = pop8(u->src); push16(u->dst, u->ram.ptr); u->ram.ptr += (Sint8)a; }
-void op_sth(Uxn *u) { Uint8 a = pop8(u->src); push8(u->dst, a); }
+void op_equ(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b == a); }
+void op_neq(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b != a); }
+void op_gth(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b > a); }
+void op_lth(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b < a); }
+void op_jmp(Uxn *u) { Uint8 a = pop8(u->src, 0); u->ram.ptr += (Sint8)a; }
+void op_jnz(Uxn *u) { Uint8 a = pop8(u->src, 0); if (pop8(u->src, 1)) u->ram.ptr += (Sint8)a; }
+void op_jsr(Uxn *u) { Uint8 a = pop8(u->src, 0); push16(u->dst, u->ram.ptr); u->ram.ptr += (Sint8)a; }
+void op_sth(Uxn *u) { Uint8 a = pop8(u->src, 0); push8(u->dst, a); }
/* Memory */
-void op_pek(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }
-void op_pok(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }
-void op_ldr(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a)); }
-void op_str(Uxn *u) { Uint8 a = pop8(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b); }
-void op_lda(Uxn *u) { Uint16 a = pop16(u->src); push8(u->src, mempeek8(u->ram.dat, a)); }
-void op_sta(Uxn *u) { Uint16 a = pop16(u->src); Uint8 b = pop8(u->src); mempoke8(u->ram.dat, a, b); }
-void op_dei(Uxn *u) { Uint8 a = pop8(u->src); push8(u->src, devpeek8(&u->dev[a >> 4], a)); }
-void op_deo(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); devpoke8(&u->dev[a >> 4], a, b); }
+void op_pek(Uxn *u) { Uint8 a = pop8(u->src, 0); push8(u->src, mempeek8(u->ram.dat, a)); }
+void op_pok(Uxn *u) { Uint8 a = pop8(u->src, 0); Uint8 b = pop8(u->src, 1); mempoke8(u->ram.dat, a, b); }
+void op_ldr(Uxn *u) { Uint8 a = pop8(u->src, 0); push8(u->src, mempeek8(u->ram.dat, u->ram.ptr + (Sint8)a)); }
+void op_str(Uxn *u) { Uint8 a = pop8(u->src, 0); Uint8 b = pop8(u->src, 1); mempoke8(u->ram.dat, u->ram.ptr + (Sint8)a, b); }
+void op_lda(Uxn *u) { Uint16 a = pop16(u->src, 0); push8(u->src, mempeek8(u->ram.dat, a)); }
+void op_sta(Uxn *u) { Uint16 a = pop16(u->src, 0); Uint8 b = pop8(u->src, 0); mempoke8(u->ram.dat, a, b); }
+void op_dei(Uxn *u) { Uint8 a = pop8(u->src, 0); push8(u->src, devpeek8(&u->dev[a >> 4], a)); }
+void op_deo(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); devpoke8(&u->dev[a >> 4], a, b); }
/* Arithmetic */
-void op_add(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b + a); }
-void op_sub(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b - a); }
-void op_mul(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b * a); }
-void op_div(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b / a); }
-void op_and(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b & a); }
-void op_ora(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b | a); }
-void op_eor(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b ^ a); }
-void op_sft(Uxn *u) { Uint8 a = pop8(u->src), b = pop8(u->src); push8(u->src, b >> (a & 0x07) << ((a & 0x70) >> 4)); }
+void op_add(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b + a); }
+void op_sub(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b - a); }
+void op_mul(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b * a); }
+void op_div(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b / a); }
+void op_and(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b & a); }
+void op_ora(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b | a); }
+void op_eor(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b ^ a); }
+void op_sft(Uxn *u) { Uint8 a = pop8(u->src, 0), b = pop8(u->src, 1); push8(u->src, b >> (a & 0x07) << ((a & 0x70) >> 4)); }
/* Stack */
void op_lit16(Uxn *u) { push16(u->src, mempeek16(u->ram.dat, u->ram.ptr++)); u->ram.ptr++; }
-void op_pop16(Uxn *u) { pop16(u->src); }
-void op_dup16(Uxn *u) { push16(u->src, peek16(u->src, 0)); }
-void op_swp16(Uxn *u) { Uint16 b = pop16(u->src), a = pop16(u->src); push16(u->src, b); push16(u->src, a); }
-void op_ovr16(Uxn *u) { push16(u->src, peek16(u->src, 1)); }
-void op_rot16(Uxn *u) { Uint16 c = pop16(u->src), b = pop16(u->src), a = pop16(u->src); push16(u->src, b); push16(u->src, c); push16(u->src, a); }
+void op_pop16(Uxn *u) { pop16(u->src, 0); }
+void op_dup16(Uxn *u) { Uint16 a = pop16(u->src, 0); push16(u->src, a); push16(u->src, a); }
+void op_swp16(Uxn *u) { Uint16 b = pop16(u->src, 0), a = pop16(u->src, 1); push16(u->src, b); push16(u->src, a); }
+void op_ovr16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b); push16(u->src, a); push16(u->src, b); }
+void op_rot16(Uxn *u) { Uint16 c = pop16(u->src, 0), b = pop16(u->src, 1), a = pop16(u->src, 2); push16(u->src, b); push16(u->src, c); push16(u->src, a); }
/* Logic(16-bits) */
-void op_equ16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b == a); }
-void op_neq16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b != a); }
-void op_gth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b > a); }
-void op_lth16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push8(u->src, b < a); }
-void op_jmp16(Uxn *u) { u->ram.ptr = pop16(u->src); }
-void op_jnz16(Uxn *u) { Uint16 a = pop16(u->src); if (pop8(u->src)) u->ram.ptr = a; }
-void op_jsr16(Uxn *u) { push16(u->dst, u->ram.ptr); u->ram.ptr = pop16(u->src); }
-void op_sth16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->dst, a); }
+void op_equ16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push8(u->src, b == a); }
+void op_neq16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push8(u->src, b != a); }
+void op_gth16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push8(u->src, b > a); }
+void op_lth16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push8(u->src, b < a); }
+void op_jmp16(Uxn *u) { u->ram.ptr = pop16(u->src, 0); }
+void op_jnz16(Uxn *u) { Uint16 a = pop16(u->src, 0); if (pop8(u->src, 0)) u->ram.ptr = a; }
+void op_jsr16(Uxn *u) { push16(u->dst, u->ram.ptr); u->ram.ptr = pop16(u->src, 0); }
+void op_sth16(Uxn *u) { Uint16 a = pop16(u->src, 0); push16(u->dst, a); }
/* Memory(16-bits) */
-void op_pek16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }
-void op_pok16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }
-void op_ldr16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, mempeek16(u->ram.dat, u->ram.ptr + (Sint8)a)); }
-void op_str16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, u->ram.ptr + (Sint8)a, b); }
-void op_lda16(Uxn *u) { Uint16 a = pop16(u->src); push16(u->src, mempeek16(u->ram.dat, a)); }
-void op_sta16(Uxn *u) { Uint16 a = pop16(u->src); Uint16 b = pop16(u->src); mempoke16(u->ram.dat, a, b); }
-void op_dei16(Uxn *u) { Uint8 a = pop8(u->src); push16(u->src, devpeek16(&u->dev[a >> 4], a)); }
-void op_deo16(Uxn *u) { Uint8 a = pop8(u->src); Uint16 b = pop16(u->src); devpoke16(&u->dev[a >> 4], a, b); }
+void op_pek16(Uxn *u) { Uint8 a = pop8(u->src, 0); push16(u->src, mempeek16(u->ram.dat, a)); }
+void op_pok16(Uxn *u) { Uint8 a = pop8(u->src, 0); Uint16 b = pop16(u->src, 0); mempoke16(u->ram.dat, a, b); }
+void op_ldr16(Uxn *u) { Uint8 a = pop8(u->src, 0); push16(u->src, mempeek16(u->ram.dat, u->ram.ptr + (Sint8)a)); }
+void op_str16(Uxn *u) { Uint8 a = pop8(u->src, 0); Uint16 b = pop16(u->src, 0); mempoke16(u->ram.dat, u->ram.ptr + (Sint8)a, b); }
+void op_lda16(Uxn *u) { Uint16 a = pop16(u->src, 0); push16(u->src, mempeek16(u->ram.dat, a)); }
+void op_sta16(Uxn *u) { Uint16 a = pop16(u->src, 0); Uint16 b = pop16(u->src, 1); mempoke16(u->ram.dat, a, b); }
+void op_dei16(Uxn *u) { Uint8 a = pop8(u->src, 0); push16(u->src, devpeek16(&u->dev[a >> 4], a)); }
+void op_deo16(Uxn *u) { Uint8 a = pop8(u->src, 0); Uint16 b = pop16(u->src, 0); devpoke16(&u->dev[a >> 4], a, b); }
/* Arithmetic(16-bits) */
-void op_add16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b + a); }
-void op_sub16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b - a); }
-void op_mul16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b * a); }
-void op_div16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b / a); }
-void op_and16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b & a); }
-void op_ora16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b | a); }
-void op_eor16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b ^ a); }
-void op_sft16(Uxn *u) { Uint16 a = pop16(u->src), b = pop16(u->src); push16(u->src, b >> (a & 0x0007) << ((a & 0x0070) >> 4)); }
+void op_add16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b + a); }
+void op_sub16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b - a); }
+void op_mul16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b * a); }
+void op_div16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b / a); }
+void op_and16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b & a); }
+void op_ora16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b | a); }
+void op_eor16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b ^ a); }
+void op_sft16(Uxn *u) { Uint16 a = pop16(u->src, 0), b = pop16(u->src, 1); push16(u->src, b >> (a & 0x0007) << ((a & 0x0070) >> 4)); }
void (*ops[])(Uxn *u) = {
op_brk, op_lit, op_nop, op_pop, op_dup, op_swp, op_ovr, op_rot,
@@ -128,9 +128,10 @@ haltuxn(Uxn *u, char *name, int id)
void
opcuxn(Uxn *u, Uint8 instr)
{
- Uint8 op = instr & 0x3f, freturn = instr & 0x40;
+ Uint8 op = instr & 0x3f, freturn = instr & 0x40, fkeep = instr & 0x80;
u->src = freturn ? &u->rst : &u->wst;
u->dst = freturn ? &u->wst : &u->rst;
+ pop8 = fkeep ? pop8_keep : pop8_nokeep;
(*ops[op])(u);
}
