diff options
| -rwxr-xr-x | cpu_dsl.py | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -240,7 +240,8 @@ class Op: decl,name = prog.getTemp(size) dst = prog.carryFlowDst = name prog.lastA = a - prog.lastB = b + prog.lastB = '(-' + b + ')' if op == '-' else b + prog.lastWasSub = op == '-' else: dst = params[2] return decl + '\n\t{dst} = {a} {op} {b};'.format( @@ -312,7 +313,8 @@ def _updateFlagsCImpl(prog, params, rawParams): resultBit = prog.paramSize(prog.lastDst) elif calc == 'half': resultBit = 4 - myRes = '({a} ^ {b} ^ {res})'.format(a = prog.lastA, b = prog.lastB, res = lastDst) + fmt = '({a} ^ {b} ^ ~{res})' if prog.lastWasSub else '({a} ^ {b} ^ {res})' + myRes = fmt.format(a = prog.lastA, b = prog.lastB, res = lastDst) elif calc == 'overflow': resultBit = prog.paramSize(prog.lastDst) - 1 myRes = '((~({a} ^ {b})) & ({a} ^ {res}))'.format(a = prog.lastA, b = prog.lastB, res = lastDst) @@ -989,6 +991,7 @@ class Program: self.carryFlowDst = None self.lastA = None self.lastB = None + self.lastWasSub = False def __str__(self): pieces = [] |