diff options
Diffstat (limited to 'cpu_dsl.py')
| -rwxr-xr-x | cpu_dsl.py | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -372,6 +372,19 @@ def _asrCImpl(prog, params, rawParams): shiftSize = prog.paramSize(rawParams[0]) mask = 1 << (shiftSize - 1) return '\n\t{dst} = ({a} >> {b}) | ({a} & {mask});'.format(a = params[0], b = params[1], dst = params[2], mask = mask) + +def _sext(size, src): + if size == 16: + return src | 0xFF00 if src & 0x80 else src + else: + return src | 0xFFFF0000 if src & 0x8000 else src + +def _sextCImpl(prog, params, rawParms): + if params[0] == 16: + fmt = '\n\t{dst} = {src} & 0x80 ? {src} | 0xFF00 : {src};' + else: + fmt = '\n\t{dst} = {src} & 0x8000 ? {src} | 0xFFFF0000 : {src};' + return fmt.format(src=params[1], dst=params[2]) _opMap = { 'mov': Op(lambda val: val).cUnaryOperator(''), @@ -390,6 +403,7 @@ _opMap = { 'c', 1, lambda prog, params: '\n\t{dst} = abs({src});'.format(dst=params[1], src=params[0]) ), 'cmp': Op().addImplementation('c', None, _cmpCImpl), + 'sext': Op(_sext).addImplementation('c', 2, _sextCImpl), 'ocall': Op().addImplementation('c', None, lambda prog, params: '\n\t{pre}{fun}({args});'.format( pre = prog.prefix, fun = params[0], args = ', '.join(['context'] + [str(p) for p in params[1:]]) )), |