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Extract a slightly more general BitVector printer.

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This one can also print 32-bit groups.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140897 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-09-30 22:18:54 +00:00
parent e27e1ca3c9
commit b7359e384f
1 changed files with 16 additions and 7 deletions
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23
utils/TableGen/RegisterInfoEmitter.cpp
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@ -205,6 +205,21 @@ RegisterInfoEmitter::EmitRegMapping(raw_ostream &OS,
}
}
// Print a BitVector as a sequence of hex numbers using a little-endian mapping.
// Width is the number of bits per hex number.
static void printBitVectorAsHex(raw_ostream &OS,
const BitVector &Bits,
unsigned Width) {
assert(Width <= 32 && "Width too large");
unsigned Digits = (Width + 3) / 4;
for (unsigned i = 0, e = Bits.size(); i < e; i += Width) {
unsigned Value = 0;
for (unsigned j = 0; j != Width && i + j != e; ++j)
Value |= Bits.test(i + j) << j;
OS << format("0x%0*x, ", Digits, Value);
}
}
// Helper to emit a set of bits into a constant byte array.
class BitVectorEmitter {
BitVector Values;
@ -216,13 +231,7 @@ public:
}
void print(raw_ostream &OS) {
for (unsigned i = 0, e = Values.size() / 8; i != e; ++i) {
unsigned char out = 0;
for (unsigned j = 0; j != 8; ++j)
if (Values[i * 8 + j])
out |= 1 << j;
OS << format("0x%02x, ", out);
}
printBitVectorAsHex(OS, Values, 8);
}
};