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For sub2w, compute carry according to negated addition rules.

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Test.
This commit is contained in:
Andrew Cagney
1997-12-02 00:27:27 +00:00
parent 3c6d5393c4
commit 51b057f27b
5 changed files with 81 additions and 5 deletions
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5
sim/d10v/simops.c
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@@ -2483,7 +2483,7 @@ OP_1000 ()
/* see ../common/sim-alu.h for a more extensive discussion on how to
compute the carry/overflow bits */
tmp = a - b;
State.C = (a < b);
State.C = (a >= b);
State.regs[OP[0]] = (tmp >> 16) & 0xffff;
State.regs[OP[0]+1] = tmp & 0xffff;
trace_output (OP_DREG);
@@ -2585,7 +2585,8 @@ OP_1 ()
trace_input ("subi", OP_REG, OP_CONSTANT16, OP_VOID);
/* see ../common/sim-alu.h for a more extensive discussion on how to
compute the carry/overflow bits */
compute the carry/overflow bits. */
/* since OP[1] is never <= 0, -OP[1] == ~OP[1]+1 can never overflow */
tmp = ((unsigned)(unsigned16) State.regs[OP[0]]
+ (unsigned)(unsigned16) ( - OP[1]));
State.C = (tmp >= (1 << 16));