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* compile.c (sim_resume): Fix and simplify overflow and carry

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handling for 32bit ALU insns.
This commit is contained in:
Jeff Law 1996-04-12 15:38:08 +00:00
parent ee9897be1c
commit 9b1271617b
2 changed files with 7 additions and 13 deletions
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5
sim/h8300/ChangeLog
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@ -1,3 +1,8 @@
Fri Apr 12 09:39:56 1996 Jeffrey A Law (law@cygnus.com)
* compile.c (sim_resume): Fix and simplify overflow and carry
handling for 32bit ALU insns.
Mon Apr 8 23:58:49 1996 Jeffrey A Law (law@cygnus.com)
* compile.c (sim_resume): Fix overflow checks for ALU insns.

15
sim/h8300/compile.c
View File

@ -1559,27 +1559,16 @@ sim_resume (step, siggnal)
case O_ADD:
v = ((rd & 0x80000000) == (ea & 0x80000000)
&& (rd & 0x80000000) != (res & 0x80000000));
c = ((unsigned) res < (unsigned) rd) || ((unsigned) res < (unsigned) ea);
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:
c = ((unsigned) res < (unsigned) rd) || ((unsigned) res < (unsigned) ea);
break;
case O_SUB:
case O_CMP:
c = (unsigned) rd < (unsigned) -ea;
break;
case O_NEG:
v = (rd == 0x80000000);
c = res != 0;
break;
}