changeset e0f289b84a4b in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=e0f289b84a4b
description:
X86: Implement a "sum of absolute differences" microop.
diffstat:
1 file changed, 19 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 19 +++++++++++++++++++
diffs (29 lines):
diff -r a1c40860fe09 -r e0f289b84a4b src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:15:15 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:15:16 2009 -0700
@@ -948,6 +948,25 @@
FpDestReg.uqw = result;
'''
+ class Msad(MediaOp):
+ code = '''
+ int srcBits = srcSize * 8;
+ int items = sizeof(FloatRegBits) / srcSize;
+
+ uint64_t sum = 0;
+ for (int i = 0; i < items; i++) {
+ int hiIndex = (i + 1) * srcBits - 1;
+ int loIndex = (i + 0) * srcBits;
+ uint64_t arg1Bits = bits(FpSrcReg1.uqw, hiIndex, loIndex);
+ uint64_t arg2Bits = bits(FpSrcReg2.uqw, hiIndex, loIndex);
+ int64_t resBits = arg1Bits - arg2Bits;
+ if (resBits < 0)
+ resBits = -resBits;
+ sum += resBits;
+ }
+ FpDestReg.uqw = sum & mask(destSize * 8);
+ '''
+
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):
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