changeset e16cf917dcec in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=e16cf917dcec
description:
X86: Implement a microop for converting fp values to ints.
diffstat:
1 file changed, 72 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 72 +++++++++++++++++++++++++++++++++
diffs (82 lines):
diff -r b750348f6da3 -r e16cf917dcec src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:25:14 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 20:25:14 2009 -0700
@@ -1176,6 +1176,78 @@
FpDestReg.uqw = result;
'''
+ class Cvtf2i(MediaOp):
+ def __init__(self, dest, src, \
+ size = None, destSize = None, srcSize = None, ext = None):
+ super(Cvtf2i, 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 (ext & 0x4) {
+ if (arg >= 0)
+ arg += 0.5;
+ else
+ arg -= 0.5;
+ }
+
+ if (destSize == 4) {
+ argBits = (uint32_t)(float)arg;
+ } else {
+ argBits = (uint64_t)arg;
+ }
+ int destHiIndex = destStart + (i + 1) * destSizeBits - 1;
+ int destLoIndex = destStart + (i + 0) * destSizeBits;
+ result = insertBits(result, destHiIndex, destLoIndex, argBits);
+ }
+ FpDestReg.uqw = result;
+ '''
+
class Cvti2f(MediaOp):
def __init__(self, dest, src, \
size = None, destSize = None, srcSize = None, ext = None):
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