changeset e60eaef99523 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=e60eaef99523
description:
X86: Implement a shuffle media microop.
diffstat:
1 file changed, 42 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 42 +++++++++++++++++++++++++++++++++
diffs (52 lines):
diff -r 2aec993cdd8f -r e60eaef99523 src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:22:56 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:25:13 2009 -0700
@@ -365,6 +365,48 @@
FpDestReg.uqw = result;
'''
+ class shuffle(MediaOp):
+ code = '''
+ assert(srcSize == destSize);
+ int size = srcSize;
+ int sizeBits = size * 8;
+ int items = sizeof(FloatRegBits) / size;
+ int options;
+ int optionBits;
+ if (size == 8) {
+ options = 2;
+ optionBits = 1;
+ } else {
+ options = 4;
+ optionBits = 2;
+ }
+
+ uint64_t result = 0;
+ uint8_t sel = ext;
+
+ for (int i = 0; i < items; i++) {
+ uint64_t resBits;
+ uint8_t lsel = sel & mask(optionBits);
+ if (lsel * size >= sizeof(FloatRegBits)) {
+ lsel -= options / 2;
+ resBits = bits(FpSrcReg2.uqw,
+ (lsel + 1) * sizeBits - 1,
+ (lsel + 0) * sizeBits);
+ } else {
+ resBits = bits(FpSrcReg1.uqw,
+ (lsel + 1) * sizeBits - 1,
+ (lsel + 0) * sizeBits);
+ }
+
+ sel >>= optionBits;
+
+ int hiIndex = (i + 1) * sizeBits - 1;
+ int loIndex = (i + 0) * sizeBits;
+ result = insertBits(result, hiIndex, loIndex, resBits);
+ }
+ FpDestReg.uqw = result;
+ '''
+
class Unpack(MediaOp):
code = '''
assert(srcSize == destSize);
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