changeset c7e724c1570f in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=c7e724c1570f
description:
X86: Create a pack media microop.
diffstat:
1 file changed, 67 insertions(+)
src/arch/x86/isa/microops/mediaop.isa | 67 +++++++++++++++++++++++++++++++++
diffs (77 lines):
diff -r 9c68aea7b1e6 -r c7e724c1570f src/arch/x86/isa/microops/mediaop.isa
--- a/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:27:44 2009 -0700
+++ b/src/arch/x86/isa/microops/mediaop.isa Mon Aug 17 18:27:54 2009 -0700
@@ -335,6 +335,73 @@
FpDestReg.uqw = result;
'''
+ class Pack(MediaOp):
+ code = '''
+ assert(srcSize == destSize * 2);
+ int items = (sizeof(FloatRegBits) / destSize);
+ int destBits = destSize * 8;
+ int srcBits = srcSize * 8;
+ uint64_t result = 0;
+ int i;
+ for (i = 0; i < items / 2; i++) {
+ uint64_t picked =
+ bits(FpSrcReg1.uqw, (i + 1) * srcBits - 1,
+ (i + 0) * srcBits);
+ unsigned signBit = bits(picked, srcBits - 1);
+ uint64_t overflow = bits(picked, srcBits - 1, destBits - 1);
+
+ // Handle saturation.
+ if (signBit) {
+ if (overflow != mask(destBits - srcBits + 1)) {
+ if (ext & 0x1)
+ picked = (1 << (destBits - 1));
+ else
+ picked = 0;
+ }
+ } else {
+ if (overflow != 0) {
+ if (ext & 0x1)
+ picked = mask(destBits - 1);
+ else
+ picked = mask(destBits);
+ }
+ }
+ result = insertBits(result,
+ (i + 1) * destBits - 1,
+ (i + 0) * destBits,
+ picked);
+ }
+ for (;i < items; i++) {
+ uint64_t picked =
+ bits(FpSrcReg2.uqw, (i - items + 1) * srcBits - 1,
+ (i - items + 0) * srcBits);
+ unsigned signBit = bits(picked, srcBits - 1);
+ uint64_t overflow = bits(picked, srcBits - 1, destBits - 1);
+
+ // Handle saturation.
+ if (signBit) {
+ if (overflow != mask(destBits - srcBits + 1)) {
+ if (ext & 0x1)
+ picked = (1 << (destBits - 1));
+ else
+ picked = 0;
+ }
+ } else {
+ if (overflow != 0) {
+ if (ext & 0x1)
+ picked = mask(destBits - 1);
+ else
+ picked = mask(destBits);
+ }
+ }
+ result = insertBits(result,
+ (i + 1) * destBits - 1,
+ (i + 0) * destBits,
+ picked);
+ }
+ FpDestReg.uqw = result;
+ '''
+
class Mxor(MediaOp):
def __init__(self, dest, src1, src2):
super(Mxor, self).__init__(dest, src1, src2, 1)
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