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authorJoern Rennecke <joern.rennecke@embecosm.com>2003-11-03 14:14:15 +0000
committerJoern Rennecke <joern.rennecke@embecosm.com>2003-11-03 14:14:15 +0000
commit794cd17b2840c7b3b1d994f46d04845b91ea8104 (patch)
tree058cb8bda0149201bfbd21314e58f8c7bf67f226
parentd36d13b0e1a771c8db490a27d8ebc7e470c635b4 (diff)
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* interp.c (fsca_s, fsrra_s): New functions.
* gencode.c (tab): Add entries for fsca and fsrra. (expand_opcode): Allow variable length n / m fields.
-rw-r--r--sim/sh/ChangeLog6
-rw-r--r--sim/sh/gencode.c38
-rw-r--r--sim/sh/interp.c49
3 files changed, 87 insertions, 6 deletions
diff --git a/sim/sh/ChangeLog b/sim/sh/ChangeLog
index 2b6cf43..faa6ebc 100644
--- a/sim/sh/ChangeLog
+++ b/sim/sh/ChangeLog
@@ -1,3 +1,9 @@
+2003-11-03 J"orn Rennecke <joern.rennecke@superh.com>
+
+ * interp.c (fsca_s, fsrra_s): New functions.
+ * gencode.c (tab): Add entries for fsca and fsrra.
+ (expand_opcode): Allow variable length n / m fields.
+
2003-10-15 J"orn Rennecke <joern.rennecke@superh.com>
* syscall.h (SYS_truncate, SYS_ftruncate): Define.
diff --git a/sim/sh/gencode.c b/sim/sh/gencode.c
index a4a1c2d..07d62a9 100644
--- a/sim/sh/gencode.c
+++ b/sim/sh/gencode.c
@@ -449,6 +449,17 @@ op tab[] =
},
/* sh4 */
+ { "", "", "fsca", "1111nnn011111101",
+ "if (FPSCR_PR)",
+ " RAISE_EXCEPTION (SIGILL);",
+ "else",
+ " {",
+ " SET_FR (n, fsca_s (FPUL, &sin));",
+ " SET_FR (n+1, fsca_s (FPUL, &cos));",
+ " }",
+ },
+
+ /* sh4 */
{ "", "", "fschg", "1111001111111101",
"SET_FPSCR (GET_FPSCR() ^ FPSCR_MASK_SZ);",
},
@@ -458,6 +469,14 @@ op tab[] =
"FP_UNARY(n, sqrt);",
},
+ /* sh4 */
+ { "", "", "fsrra", "1111nnnn01111101",
+ "if (FPSCR_PR)",
+ " RAISE_EXCEPTION (SIGILL);",
+ "else",
+ " SET_FR (n, fsrra_s (FR (n)));",
+ },
+
/* sh2e */
{ "", "", "fsub <FREG_M>,<FREG_N>", "1111nnnnmmmm0001",
"FP_OP(n, -, m);",
@@ -1979,6 +1998,8 @@ expand_opcode (shift, val, i, s)
{
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);
@@ -2003,12 +2024,17 @@ expand_opcode (shift, val, i, s)
}
case 'n':
case 'm':
- for (j = 0; j < 16; j++)
- {
- expand_opcode (shift - 4, val | (j << shift), i, s + 4);
-
- }
- break;
+ {
+ 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;
+ }
case 'M':
/* A1, A0,X0,X1,Y0,Y1,M0,A1G,M1,M1G */
for (j = 5; j < 16; j++)
diff --git a/sim/sh/interp.c b/sim/sh/interp.c
index 711df1e..5ca8e61 100644
--- a/sim/sh/interp.c
+++ b/sim/sh/interp.c
@@ -1411,6 +1411,55 @@ macl (regs, memory, n, m)
MACH = mach;
}
+float
+fsca_s (int in, double (*f) (double))
+{
+ double rad = ldexp ((in & 0xffff), -15) * 3.141592653589793238462643383;
+ double result = (*f) (rad);
+ double error, upper, lower, frac;
+ int exp;
+
+ /* Search the value with the maximum error that is still within the
+ architectural spec. */
+ error = ldexp (1., -21);
+ /* compensate for calculation inaccuracy by reducing error. */
+ error = error - ldexp (1., -50);
+ upper = result + error;
+ frac = frexp (upper, &exp);
+ upper = ldexp (floor (ldexp (frac, 24)), exp - 24);
+ lower = result - error;
+ frac = frexp (lower, &exp);
+ lower = ldexp (ceil (ldexp (frac, 24)), exp - 24);
+ return abs (upper - result) >= abs (lower - result) ? upper : lower;
+}
+
+float
+fsrra_s (float in)
+{
+ double result = 1. / sqrt (in);
+ int exp;
+ double frac, upper, lower, error, eps;
+
+ /* refine result */
+ result = result - (result * result * in - 1) * 0.5 * result;
+ /* Search the value with the maximum error that is still within the
+ architectural spec. */
+ frac = frexp (result, &exp);
+ frac = ldexp (frac, 24);
+ error = 4.; /* 1 << 24-1-21 */
+ /* use eps to compensate for possible 1 ulp error in our 'exact' result. */
+ eps = ldexp (1., -29);
+ upper = floor (frac + error - eps);
+ if (upper > 16777216.)
+ upper = floor ((frac + error - eps) * 0.5) * 2.;
+ lower = ceil ((frac - error + eps) * 2) * .5;
+ if (lower > 8388608.)
+ lower = ceil (frac - error + eps);
+ upper = ldexp (upper, exp - 24);
+ lower = ldexp (lower, exp - 24);
+ return upper - result >= result - lower ? upper : lower;
+}
+
static struct loop_bounds
get_loop_bounds (rs, re, memory, mem_end, maskw, endianw)
int rs, re;