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-rw-r--r--sim/sh/gencode.c171
1 files changed, 81 insertions, 90 deletions
diff --git a/sim/sh/gencode.c b/sim/sh/gencode.c
index 07d62a9..26b461e 100644
--- a/sim/sh/gencode.c
+++ b/sim/sh/gencode.c
@@ -449,7 +449,7 @@ op tab[] =
},
/* sh4 */
- { "", "", "fsca", "1111nnn011111101",
+ { "", "", "fsca", "1111eeee11111101",
"if (FPSCR_PR)",
" RAISE_EXCEPTION (SIGILL);",
"else",
@@ -1950,128 +1950,100 @@ gengastab ()
}
-/* Convert a string of 4 binary digits into an int */
-
-static
-int
-bton (s)
- char *s;
-
-{
- int n = 0;
- int v = 8;
- while (v)
- {
- if (*s == '1')
- n |= v;
- v >>= 1;
- s++;
- }
- return n;
-}
-
static unsigned char table[1 << 16];
-/* Take an opcode expand all varying fields in it out and fill all the
- right entries in 'table' with the opcode index*/
+/* Take an opcode, expand all varying fields in it out and fill all the
+ right entries in 'table' with the opcode index. */
static void
-expand_opcode (shift, val, i, s)
- int shift;
+expand_opcode (val, i, s)
int val;
int i;
char *s;
{
- int j;
-
if (*s == 0)
{
table[val] = i;
}
else
{
+ int j = 0, m = 0;
+
switch (s[0])
{
-
+ default:
+ fprintf (stderr, "expand_opcode: illegal char '%c'\n", s[0]);
+ exit (1);
case '0':
case '1':
- {
- int m, mv;
-
- if (s[1] - '0' > 1U || !s[2] || ! s[3])
- expand_opcode (shift - 1, val + s[0] - '0', i, s + 1);
- val |= bton (s) << shift;
- if (s[2] == '0' || s[2] == '1')
- expand_opcode (shift - 4, val, i, s + 4);
- else if (s[2] == 'N')
- for (j = 0; j < 4; j++)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
- else if (s[2] == 'x')
- for (j = 0; j < 4; j += 2)
- for (m = 0; m < 32; m++)
- {
- /* Ignore illegal nopy */
- if ((m & 7) == 0 && m != 0)
- continue;
- mv = m & 3 | (m & 4) << 2 | (m & 8) << 3 | (m & 16) << 4;
- expand_opcode (shift - 4, val | mv | (j << shift), i,
- s + 4);
- }
- else if (s[2] == 'y')
- for (j = 0; j < 2; j++)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ /* Consume an arbitrary number of ones and zeros. */
+ do {
+ j = (j << 1) + (s[m++] - '0');
+ } while (s[m] == '0' || s[m] == '1');
+ expand_opcode ((val << m) | j, i, s + m);
break;
- }
+
+ case 'N': /* NN -- four-way fork */
+ for (j = 0; j < 4; j++)
+ expand_opcode ((val << 2) | j, i, s + 2);
+ break;
+ case 'x': /* xx -- 2-way fork */
+ /* Cross-breeding with movy moved to separate function. */
+ for (j = 0; j < 4; j += 2)
+ expand_opcode ((val << 2) | j, i, s + 2);
+ break;
+ case 'y': /* yy -- two-way fork */
+ for (j = 0; j < 2; j++)
+ expand_opcode ((val << 2) | j, i, s + 2);
+ break;
+ case 'i': /* eg. "i8*1" */
+ case '.': /* "...." is a wildcard */
case 'n':
case 'm':
- {
- int digits = 1;
- while (s[digits] == s[0])
- digits++;
- for (j = 0; j < (1 << digits); j++)
- {
- expand_opcode (shift - digits, val | (j << shift), i,
- s + digits);
- }
- break;
- }
+ /* nnnn, mmmm, i#*#, .... -- 16-way fork. */
+ for (j = 0; j < 16; j++)
+ expand_opcode ((val << 4) | j, i, s + 4);
+ break;
+ case 'e':
+ /* eeee -- even numbered register:
+ 8 way fork. */
+ for (j = 0; j < 15; j += 2)
+ expand_opcode ((val << 4) | j, i, s + 4);
+ break;
case 'M':
- /* A1, A0,X0,X1,Y0,Y1,M0,A1G,M1,M1G */
- for (j = 5; j < 16; j++)
- if (j != 6)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ /* A0, A1, X0, X1, Y0, Y1, M0, M1, A0G, A1G:
+ MMMM -- 10-way fork */
+ expand_opcode ((val << 4) | 5, i, s + 4);
+ for (j = 7; j < 16; j++)
+ expand_opcode ((val << 4) | j, i, s + 4);
break;
case 'G':
- /* A1G, A0G: */
+ /* A1G, A0G:
+ GGGG -- two-way fork */
for (j = 13; j <= 15; j +=2)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ expand_opcode ((val << 4) | j, i, s + 4);
break;
case 's':
+ /* ssss -- 10-way fork */
/* System registers mach, macl, pr: */
for (j = 0; j < 3; j++)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ expand_opcode ((val << 4) | j, i, s + 4);
/* System registers fpul, fpscr/dsr, a0, x0, x1, y0, y1: */
for (j = 5; j < 12; j++)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ expand_opcode ((val << 4) | j, i, s + 4);
break;
case 'X':
case 'a':
- val |= bton (s) << shift;
- for (j = 0; j < 16; j += 8)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ /* XX, aa -- two-way fork */
+ for (j = 0; j < 4; j += 2)
+ expand_opcode ((val << 2) | j, i, s + 2);
break;
case 'Y':
case 'A':
- val |= bton (s) << shift;
- for (j = 0; j < 8; j += 4)
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
+ /* YY, AA -- two-way fork */
+ for (j = 0; j < 2; j++)
+ expand_opcode ((val << 2) | j, i, s + 2);
break;
-
- default:
- for (j = 0; j < (1 << (shift + 4)); j++)
- {
- table[val | j] = i;
- }
}
}
}
@@ -2127,7 +2099,7 @@ filltable (p)
for (; p->name; p++)
{
p->index = index++;
- expand_opcode (12, 0, p->index, p->code);
+ expand_opcode (0, p->index, p->code);
}
}
@@ -2136,11 +2108,29 @@ filltable (p)
processing insns (ppi) for code 0xf800 (ppi nopx nopy). Copy the
latter tag to represent all combinations of ppi with ddt. */
static void
-ppi_moves ()
+expand_ppi_movxy ()
{
int i;
for (i = 0xf000; i < 0xf400; i++)
+ if ((i & 3) == 0 && (i & 12) != 0 && table[i] != 0)
+ {
+ /* A movx insn, which needs to be filled out with the
+ corresponding movy insns. This used to be done in
+ expand_opcode. */
+ int m, mv;
+
+ for (m = 0; m < 32; m++)
+ {
+ /* Ignore illegal nopy */
+ if ((m & 7) == 0 && m != 0)
+ continue;
+ mv = m & 3 | (m & 4) << 2 | (m & 8) << 3 | (m & 16) << 4;
+ table [i | mv] = table [i];
+ }
+ }
+
+ for (i = 0xf000; i < 0xf400; i++)
if (table[i])
table[i + 0x800] = table[0xf800];
}
@@ -2179,7 +2169,8 @@ gensim_caselist (p)
s += 4;
break;
case 'n':
- printf (" int n = (iword >>8) & 0xf;\n");
+ case 'e':
+ printf (" int n = (iword >> 8) & 0xf;\n");
needn = 1;
s += 4;
break;
@@ -2202,7 +2193,7 @@ gensim_caselist (p)
case 's':
case 'M':
case 'G':
- printf (" int m = (iword >>4) & 0xf;\n");
+ printf (" int m = (iword >> 4) & 0xf;\n");
s += 4;
break;
case 'X':
@@ -2618,7 +2609,7 @@ main (ac, av)
memset (table, 0, sizeof table);
filltable (movsxy_tab);
- ppi_moves ();
+ expand_ppi_movxy ();
dumptable ("sh_dsp_table", 1 << 12, 0xf000);
memset (table, 0, sizeof table);
generated by cgit v1.1 at 2024-12-18 19:44:25 +0000