changeset 571fd8d89903 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=571fd8d89903
description:
X86: Implement a media microop for converting integer values to
floating point.
diffstat:
1 file changed, 60 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 60 +++++++++++++++++++++++++++++++++
diffs (68 lines):
diff -r 3f716cda05c9 -r 571fd8d89903 src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:40:40 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:41:25 2009 -0700
@@ -758,4 +758,64 @@
}
FpDestReg.uqw = result;
'''
+
+ class Cvti2f(MediaOp):
+ def __init__(self, dest, src, \
+ size = None, destSize = None, srcSize = None, ext = None):
+ super(Cvti2f, 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);
+ int64_t sArg = argBits | (0 - (argBits & (1 << srcHiIndex)));
+ double arg = sArg;
+
+ 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;
+ '''
}};
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