changeset d7907eaf7419 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=d7907eaf7419
description:
X86: Implement an integer media addition microop with optional
saturation.
diffstat:
2 files changed, 36 insertions(+)
src/arch/x86/isa/includes.isa | 1
src/arch/x86/isa/microops/mediaop.isa | 35 +++++++++++++++++++++++++++++++++
diffs (56 lines):
diff -r e8cb266c9451 -r d7907eaf7419 src/arch/x86/isa/includes.isa
--- a/src/arch/x86/isa/includes.isa Mon Aug 17 20:04:02 2009 -0700
+++ b/src/arch/x86/isa/includes.isa Mon Aug 17 20:04:02 2009 -0700
@@ -156,6 +156,7 @@
#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"
diff -r e8cb266c9451 -r d7907eaf7419 src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:04:02 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:04:02 2009 -0700
@@ -759,6 +759,41 @@
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):
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