changeset ff5e7e6bcfbd in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=ff5e7e6bcfbd
description:
X86: Implement an unpack microop.
diffstat:
1 file changed, 26 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 26 ++++++++++++++++++++++++++
diffs (34 lines):
diff -r 962f58808d53 -r ff5e7e6bcfbd src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:15:24 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:15:39 2009 -0700
@@ -308,4 +308,30 @@
FpDestReg.uqw =
insertBits(FpDestReg.uqw, destSize * 8 - 1, 0, srcReg1);
'''
+
+ class Unpack(MediaOp):
+ code = '''
+ assert(srcSize == destSize);
+ int size = destSize;
+ int items = (sizeof(FloatRegBits) / size) / 2;
+ int offset = sel ? items : 0;
+ uint64_t result = 0;
+ for (int i = 0; i < items; i++) {
+ uint64_t pickedLow =
+ bits(FpSrcReg1.uqw, (i + offset + 1) * 8 * size - 1,
+ (i + offset) * 8 * size);
+ result = insertBits(result,
+ (2 * i + 1) * 8 * size - 1,
+ (2 * i + 0) * 8 * size,
+ pickedLow);
+ uint64_t pickedHigh =
+ bits(FpSrcReg2.uqw, (i + offset + 1) * 8 * size - 1,
+ (i + offset) * 8 * size);
+ result = insertBits(result,
+ (2 * i + 2) * 8 * size - 1,
+ (2 * i + 1) * 8 * size,
+ pickedHigh);
+ }
+ FpDestReg.uqw = result;
+ '''
}};
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