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authorGabe Black <gblack@eecs.umich.edu>2009-08-17 20:22:56 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 20:22:56 -0700
commit90786e43fc8ba16d6e1941ca996e82e94f186e5e (patch)
tree6d524f7c1d0e2ffa55bb253ebb0b6883578d437f
parent4c23e631f26f4195212df94684b347fe3639d3fe (diff)
downloadgem5-90786e43fc8ba16d6e1941ca996e82e94f186e5e.tar.xz
X86: Implement a microop that moves sign bits.
-rw-r--r--src/arch/x86/isa/microops/mediaop.isa17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 981ffc74b..bef661848 100644
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -330,6 +330,23 @@ let {{
}
'''
+ class Movsign(MediaOp):
+ def __init__(self, dest, src, \
+ size = None, destSize = None, srcSize = None, ext = None):
+ super(Movsign, self).__init__(dest, src,\
+ "InstRegIndex(0)", size, destSize, srcSize, ext)
+ code = '''
+ int items = sizeof(FloatRegBits) / srcSize;
+ uint64_t result = 0;
+ int offset = (ext & 0x1) ? items : 0;
+ for (int i = 0; i < items; i++) {
+ uint64_t picked =
+ bits(FpSrcReg1.uqw, (i + 1) * 8 * srcSize - 1);
+ result = insertBits(result, i + offset, i + offset, picked);
+ }
+ DestReg = DestReg | result;
+ '''
+
class Unpack(MediaOp):
code = '''
assert(srcSize == destSize);