/// Print this partial mapping on \p OS;
void print(raw_ostream &OS) const;
+
+ /// Check that the Mask is compatible with the RegBank.
+ /// Indeed, if the RegBank cannot accomadate the "active bits" of the mask,
+ /// there is no way this mapping is valid.
+ void verify() const;
};
/// Helper struct that represents how a value is mapped through
dbgs() << '\n';
}
+void RegisterBankInfo::PartialMapping::verify() const {
+ assert(RegBank && "Register bank not set");
+ // Check what is the minimum width that will live into RegBank.
+ // RegBank will have to, at least, accomodate all the bits between the first
+ // and last bits active in Mask.
+ // If Mask is zero, then ActiveWidth is 0.
+ unsigned ActiveWidth = 0;
+ // Otherwise, remove the trailing and leading zeros from the bitwidth.
+ // 0..0 ActiveWidth 0..0.
+ if (Mask.getBoolValue())
+ ActiveWidth = Mask.getBitWidth() - Mask.countLeadingZeros() -
+ Mask.countTrailingZeros();
+ (void)ActiveWidth;
+ assert(ActiveWidth <= Mask.getBitWidth() &&
+ "Wrong computation of ActiveWidth, overflow?");
+ assert(RegBank->getSize() >= ActiveWidth &&
+ "Register bank too small for Mask");
+}
+
void RegisterBankInfo::PartialMapping::print(raw_ostream &OS) const {
SmallString<128> MaskStr;
Mask.toString(MaskStr, /*Radix*/ 2, /*Signed*/ 0, /*formatAsCLiteral*/ true);