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authorGabe Black <gblack@eecs.umich.edu>2009-08-17 20:04:02 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 20:04:02 -0700
commit83df309a7ed25373e265b3885d3871547dff6274 (patch)
tree8fb7d74a2962bb9dacf774943f737ca72af22207 /src/arch
parent35b0983ca983af7223ce1ef38ff15d8462aa7d4b (diff)
downloadgem5-83df309a7ed25373e265b3885d3871547dff6274.tar.xz
X86: Implement a media microop that converts between floating point data types.
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/isa/microops/mediaop.isa68
1 files changed, 68 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 2995a82d1..fe8368707 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -819,6 +819,74 @@ let {{
FpDestReg.uqw = result;
'''
+ class Cvtf2f(MediaOp):
+ def __init__(self, dest, src, \
+ size = None, destSize = None, srcSize = None, ext = None):
+ super(Cvtf2f, self).__init__(dest, src,\
+ "InstRegIndex(0)", size, destSize, srcSize, ext)
+ code = '''
+ union floatInt
+ {
+ float f;
+ uint32_t i;
+ };
+ union doubleInt
+ {
+ double d;
+ uint64_t i;
+ };
+
+ assert(destSize == 4 || destSize == 8);
+ assert(srcSize == 4 || srcSize == 8);
+ int srcSizeBits = srcSize * 8;
+ int destSizeBits = destSize * 8;
+ int items;
+ int srcStart = 0;
+ int destStart = 0;
+ if (srcSize == 2 * destSize) {
+ items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / srcSize;
+ if (ext & 0x2)
+ destStart = destSizeBits * items;
+ } else if (destSize == 2 * srcSize) {
+ items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / destSize;
+ if (ext & 0x2)
+ srcStart = srcSizeBits * items;
+ } else {
+ items = (ext & 0x1) ? 1: sizeof(FloatRegBits) / destSize;
+ }
+ uint64_t result = FpDestReg.uqw;
+
+ for (int i = 0; i < items; i++) {
+ int srcHiIndex = srcStart + (i + 1) * srcSizeBits - 1;
+ int srcLoIndex = srcStart + (i + 0) * srcSizeBits;
+ uint64_t argBits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex);
+ double arg;
+
+ if (srcSize == 4) {
+ floatInt fi;
+ fi.i = argBits;
+ arg = fi.f;
+ } else {
+ doubleInt di;
+ di.i = argBits;
+ arg = di.d;
+ }
+ if (destSize == 4) {
+ floatInt fi;
+ fi.f = arg;
+ argBits = fi.i;
+ } else {
+ doubleInt di;
+ di.d = arg;
+ argBits = di.i;
+ }
+ int destHiIndex = destStart + (i + 1) * destSizeBits - 1;
+ int destLoIndex = destStart + (i + 0) * destSizeBits;
+ result = insertBits(result, destHiIndex, destLoIndex, argBits);
+ }
+ FpDestReg.uqw = result;
+ '''
+
class Mcmpi2r(MediaOp):
code = '''
union floatInt