Lines Matching full:constants

1 //===- ConstantHoisting.cpp - Prepare code for expensive constants --------===//
9 // This pass identifies expensive constants to hoist and coalesces them to
13 // First it scans all instructions for integer constants and calculates its
21 // Similar constants are coalesced to reduce register pressure and
27 // The SelectionDAG recognizes such constants as opaque and doesn't perform
30 // This optimization is only applied to integer constants in instructions and
45 #include "llvm/IR/Constants.h"
78 STATISTIC(NumConstantsHoisted, "Number of constants hoisted");
79 STATISTIC(NumConstantsRebased, "Number of constants rebased");
93     cl::desc("Do not rebase if number of dependent constants of a Base is less "
383   // Ignore cheap integer constants.  in collectConstantCandidates()
501 /// Scan the instruction for expensive integer constants and record them
511     // The cost of materializing the constants (defined in  in collectConstantCandidates()
522 /// Collect all integer constants in the function that cannot be folded
555 // From a list of constants, one needs to picked as the base and the other
556 // constants will be transformed into an offset from that base constant. The
557 // question is which we can pick best? For example, consider these constants
560 //  Constants| 2 | 4 | 12 | 42 |
564 // offsets for constants 2 and 4 (i.e. -10 and -8 respectively). If negative
576 // constants, we fall back to the straightforward algorithm otherwise
593   LLVM_DEBUG(dbgs() << "== Maximize constants in range ==\n");  in maximizeConstantsInRange()
635 /// constants with respect to the base constant.
642   // Don't hoist constants that have only one use.  in findAndMakeBaseConstant()
653   // Rebase the constants with respect to the base constant.  in findAndMakeBaseConstant()
675   // Sort the constants by value and type. This invalidates the mapping!  in findBaseConstants()
753 /// Emit materialization code for all rebased constants and update their
847 /// materialization code for derived constants.
865       // First, collect constants depending on this IP of the base.  in emitBaseConstants()
882       // If only few constants depend on this IP of base, skip rebasing,  in emitBaseConstants()
907       // Emit materialization code for rebased constants depending on this IP.  in emitBaseConstants()
945 /// Optimize expensive integer constants in the given function.
963   // Combine constants that can be easily materialized with an add from a common  in runImpl()
972   // constants.  in runImpl()