From ecc62e750e5f9a34c2c89570d2cd940b2dcf0035 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Mon, 17 Aug 2009 18:15:39 -0700 Subject: [PATCH] X86: Implement an unpack microop. --- src/arch/x86/isa/microops/mediaop.isa | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa index a5371474e..7e03fcba3 100644 --- a/src/arch/x86/isa/microops/mediaop.isa +++ b/src/arch/x86/isa/microops/mediaop.isa @@ -308,4 +308,30 @@ let {{ 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; + ''' }}; -- 2.30.2