* compile.c (sim_resume): Fix overflow checks for ALU insns.

So that int-compare.c passes.

diff --git a/sim/h8300/ChangeLog b/sim/h8300/ChangeLog
index f573246..ce54af3 100644 (file)
--- a/sim/h8300/ChangeLog
+++ b/sim/h8300/ChangeLog
@@ -1,3 +1,7 @@
+Mon Apr  8 23:58:49 1996  Jeffrey A Law  (law@cygnus.com)
+
+       * compile.c (sim_resume): Fix overflow checks for ALU insns.
+
 Fri Apr  5 17:20:59 1996  Jeffrey A Law  (law@cygnus.com)
 
        * compile.c (decode): Use "bit" to hold L_3 immediates instead

diff --git a/sim/h8300/compile.c b/sim/h8300/compile.c
index f55249e..7892dc6 100644 (file)
--- a/sim/h8300/compile.c
+++ b/sim/h8300/compile.c
@@ -1508,8 +1508,22 @@ sim_resume (step, siggnal)
     just_flags_alu8:
       n = res & 0x80;
       nz = res & 0xff;
-      v = ((ea & 0x80) == (rd & 0x80)) && ((ea & 0x80) != (res & 0x80));
       c = (res & 0x100);
+      switch (code->opcode / 4)
+       {
+       case O_ADD:
+         v = ((rd & 0x80) == (ea & 0x80)
+              && (rd & 0x80) != (res & 0x80));
+         break;
+       case O_SUB:
+       case O_CMP:
+         v = ((rd & 0x80) != (-ea & 0x80)
+              && (rd & 0x80) != (res & 0x80));
+         break;
+       case O_NEG:
+         v = (rd == 0x80);
+         break;
+       }
       goto next;
 
     alu16:
@@ -1517,8 +1531,22 @@ sim_resume (step, siggnal)
     just_flags_alu16:
       n = res & 0x8000;
       nz = res & 0xffff;
-      v = ((ea & 0x8000) == (rd & 0x8000)) && ((ea & 0x8000) != (res & 0x8000));
       c = (res & 0x10000);
+      switch (code->opcode / 4)
+       {
+       case O_ADD:
+         v = ((rd & 0x8000) == (ea & 0x8000)
+              && (rd & 0x8000) != (res & 0x8000));
+         break;
+       case O_SUB:
+       case O_CMP:
+         v = ((rd & 0x8000) != (-ea & 0x8000)
+              && (rd & 0x8000) != (res & 0x8000));
+         break;
+       case O_NEG:
+         v = (rd == 0x8000);
+         break;
+       }
       goto next;
 
     alu32:
@@ -1526,8 +1554,22 @@ sim_resume (step, siggnal)
     just_flags_alu32:
       n = res & 0x80000000;
       nz = res & 0xffffffff;
-      v = ((ea & 0x80000000) == (rd & 0x80000000))
-       && ((ea & 0x80000000) != (res & 0x80000000));
+      switch (code->opcode / 4)
+       {
+       case O_ADD:
+         v = ((rd & 0x80000000) == (ea & 0x80000000)
+              && (rd & 0x80000000) != (res & 0x80000000));
+         break;
+       case O_SUB:
+       case O_CMP:
+         v = ((rd & 0x80000000) != (-ea & 0x80000000)
+              && (rd & 0x80000000) != (res & 0x80000000));
+         break;
+       case O_NEG:
+         v = (rd == 0x80000000);
+         break;
+       }
+      goto next;
       switch (code->opcode / 4)
        {
        case O_ADD: