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X86: Implement an integer media addition microop with optional saturation.

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Gabe Black 2009-08-17 20:04:02 -07:00
parent f5ac4f51d9
commit c278760da0
2 changed files with 36 additions and 0 deletions
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1
src/arch/x86/isa/includes.isa
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@ -156,6 +156,7 @@ output exec {{
#include "arch/x86/miscregs.hh"
#include "arch/x86/tlb.hh"
#include "base/bigint.hh"
#include "base/condcodes.hh"
#include "cpu/base.hh"
#include "cpu/exetrace.hh"
#include "sim/sim_exit.hh"

35
src/arch/x86/isa/microops/mediaop.isa
View file

@ -759,6 +759,41 @@ let {{
FpDestReg.uqw = result;
'''
class Maddi(MediaOp):
code = '''
assert(srcSize == destSize);
int size = srcSize;
int sizeBits = size * 8;
int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / size);
uint64_t result = FpDestReg.uqw;
for (int i = 0; i < items; i++) {
int hiIndex = (i + 1) * sizeBits - 1;
int loIndex = (i + 0) * sizeBits;
uint64_t arg1Bits = bits(FpSrcReg1.uqw, hiIndex, loIndex);
uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
uint64_t resBits = arg1Bits + arg2Bits;
if (ext & 0x2) {
if (findCarry(sizeBits, resBits, arg1Bits, arg2Bits))
resBits = mask(sizeBits);
} else if (ext & 0x4) {
int arg1Sign = bits(arg1Bits, sizeBits - 1);
int arg2Sign = bits(arg2Bits, sizeBits - 1);
int resSign = bits(resBits, sizeBits - 1);
if ((arg1Sign == arg2Sign) && (arg1Sign != resSign)) {
if (resSign == 0)
resBits = (1 << (sizeBits - 1));
else
resBits = mask(sizeBits - 1);
}
}
result = insertBits(result, hiIndex, loIndex, resBits);
}
FpDestReg.uqw = result;
'''
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):