changeset cfe4a8f16e5f in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=cfe4a8f16e5f
description:
X86: Implement a media integer multiply microop.
diffstat:
1 file changed, 39 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 39 +++++++++++++++++++++++++++++++++
diffs (49 lines):
diff -r 8038b47efe64 -r cfe4a8f16e5f src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:04:03 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:15:15 2009 -0700
@@ -870,6 +870,45 @@
FpDestReg.uqw = result;
'''
+ class Mmuli(MediaOp):
+ code = '''
+ int srcBits = srcSize * 8;
+ int destBits = destSize * 8;
+ assert(destBits <= 64);
+ assert(destSize >= srcSize);
+ int items = (ext & 0x1) ? 1: (sizeof(FloatRegBits) / destSize);
+ uint64_t result = FpDestReg.uqw;
+
+ for (int i = 0; i < items; i++) {
+ int srcHiIndex = (i + 1) * srcBits - 1;
+ int srcLoIndex = (i + 0) * srcBits;
+ uint64_t arg1Bits = bits(FpSrcReg1.uqw, srcHiIndex,
srcLoIndex);
+ uint64_t arg2Bits = bits(FpSrcReg2.uqw, srcHiIndex,
srcLoIndex);
+ uint64_t resBits;
+
+ if (ext & 0x2) {
+ int64_t arg1 = arg1Bits |
+ (0 - (arg1Bits & (1 << (srcBits - 1))));
+ int64_t arg2 = arg2Bits |
+ (0 - (arg2Bits & (1 << (srcBits - 1))));
+ resBits = (uint64_t)(arg1 * arg2);
+ } else {
+ resBits = arg1Bits * arg2Bits;
+ }
+
+ if (ext & 0x4)
+ resBits += (1 << (destBits - 1));
+
+ if (ext & 0x8)
+ resBits >>= destBits;
+
+ int destHiIndex = (i + 1) * destBits - 1;
+ int destLoIndex = (i + 0) * destBits;
+ result = insertBits(result, destHiIndex, destLoIndex, resBits);
+ }
+ FpDestReg.uqw = result;
+ '''
+
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):
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