From: Michael Snyder <msnyder@redhat.com>
To: gdb-patches@sources.redhat.com
Cc: kazu@cs.umass.edu, dvenkat@noida.hcltech.com, avolkov@transas.com
Subject: [PATCH/RFA] h8300 sim: add daa and das insns
Date: Tue, 08 Apr 2003 06:24:00 -0000 [thread overview]
Message-ID: <3E926B1A.879C98CC@redhat.com> (raw)
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Here's my implementation of daa/das:
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2003-04-07 Michael Snyder <msnyder@redhat.com>
* compile.c (sim_resume): Implement daa and das insns.
Index: compile.c
===================================================================
RCS file: /cvs/cvsfiles/devo/sim/h8300/compile.c,v
retrieving revision 1.70
diff -p -r1.70 compile.c
*** compile.c 2003/03/27 22:01:29 1.70
--- compile.c 2003/04/08 06:20:31
*************** sim_resume (SIM_DESC sd, int step, int s
*** 2138,2143 ****
--- 2146,2202 ----
}
goto next;
+ case O (O_DAA, SB):
+ /* Decimal Adjust Addition. This is for BCD arithmetic. */
+ res = GET_B_REG (code->src.reg);
+ if (!c && (0 <= (res >> 4) && (res >> 4) <= 9) &&
+ !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+ res = res; /* Value added == 0. */
+ else if (!c && (0 <= (res >> 4) && (res >> 4) <= 8) &&
+ !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+ res = res + 0x6; /* Value added == 6. */
+ else if (!c && (0 <= (res >> 4) && (res >> 4) <= 9) &&
+ h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
+ res = res + 0x6; /* Value added == 6. */
+ else if (!c && (10 <= (res >> 4) && (res >> 4) <= 15) &&
+ !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+ res = res + 0x60; /* Value added == 60. */
+ else if (!c && (9 <= (res >> 4) && (res >> 4) <= 15) &&
+ !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+ res = res + 0x66; /* Value added == 66. */
+ else if (!c && (10 <= (res >> 4) && (res >> 4) <= 15) &&
+ h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
+ res = res + 0x66; /* Value added == 66. */
+ else if ( c && (1 <= (res >> 4) && (res >> 4) <= 2) &&
+ !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+ res = res + 0x60; /* Value added == 60. */
+ else if ( c && (1 <= (res >> 4) && (res >> 4) <= 2) &&
+ !h && (10 <= (res & 0xf) && (res & 0xf) <= 15))
+ res = res + 0x66; /* Value added == 66. */
+ else if (c && (1 <= (res >> 4) && (res >> 4) <= 3) &&
+ h && (0 <= (res & 0xf) && (res & 0xf) <= 3))
+ res = res + 0x66; /* Value added == 66. */
+
+ goto alu8;
+
+ case O (O_DAS, SB):
+ /* Decimal Adjust Subtraction. This is for BCD arithmetic. */
+ res = GET_B_REG (code->src.reg); /* FIXME fetch, fetch2... */
+ if (!c && (0 <= (res >> 4) && (res >> 4) <= 9) &&
+ !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+ res = res; /* Value added == 0. */
+ else if (!c && (0 <= (res >> 4) && (res >> 4) <= 8) &&
+ h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
+ res = res + 0xfa; /* Value added == 0xfa. */
+ else if ( c && (7 <= (res >> 4) && (res >> 4) <= 15) &&
+ !h && (0 <= (res & 0xf) && (res & 0xf) <= 9))
+ res = res + 0xa0; /* Value added == 0xa0. */
+ else if (c && (6 <= (res >> 4) && (res >> 4) <= 15) &&
+ h && (6 <= (res & 0xf) && (res & 0xf) <= 15))
+ res = res + 0x9a; /* Value added == 0x9a. */
+
+ goto alu8;
+
default:
illegal:
cpu.state = SIM_STATE_STOPPED;
next reply other threads:[~2003-04-08 6:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-08 6:24 Michael Snyder [this message]
2003-04-12 21:25 ` Kazu Hirata
2003-04-13 16:57 ` Michael Snyder
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