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authorGabe Black <gblack@eecs.umich.edu>2009-08-17 18:41:25 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 18:41:25 -0700
commit8e97cd9c8fdaa0a1c0093ef0f969798ab06161ee (patch)
treefe3b12c439303aa66f026cc6c9d6a6bc70979293 /src/arch/x86/isa
parentb34b507fd848db1ddf59fc024790f93ef5f4ad09 (diff)
downloadgem5-8e97cd9c8fdaa0a1c0093ef0f969798ab06161ee.tar.xz
X86: Implement a media microop for converting integer values to floating point.
Diffstat (limited to 'src/arch/x86/isa')
-rw-r--r--src/arch/x86/isa/microops/mediaop.isa60
1 files changed, 60 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index edfc27908..641f37865 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -758,4 +758,64 @@ let {{
}
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;
+ '''
}};