13 // complex alignment assumptions that apply to vector loads and stores that
34 #define DEBUG_TYPE "alignment-from-assumptions"
38   "Number of loads changed by alignment assumptions");
40   "Number of stores changed by alignment assumptions");
42   "Number of memory intrinsics changed by alignment assumptions");
44 // Given an expression for the (constant) alignment, AlignSCEV, and an
46 // DiffSCEV, compute the alignment of the displaced pointer if it can be reduced
47 // to a constant. Using SCEV to compute alignment handles the case where
53   // DiffUnits = Diff % int64_t(Alignment)  in getNewAlignmentDiff()
63     // If the displacement is an exact multiple of the alignment, then the  in getNewAlignmentDiff()
64     // displaced pointer has the same alignment as the aligned pointer, so  in getNewAlignmentDiff()
65     // return the alignment value.  in getNewAlignmentDiff()
80 // alignment AlignSCEV. Use that information, if possible, to compute a new
81 // alignment for Ptr.
99   LLVM_DEBUG(dbgs() << "AFI: alignment of " << *Ptr << " relative to "  in getNewAlignment()
104     LLVM_DEBUG(dbgs() << "\tnew alignment: " << DebugStr(NewAlignment) << "\n");  in getNewAlignment()
109     // The relative offset to the alignment assumption did not yield a constant,  in getNewAlignment()
112     // 32-byte aligned, but instead alternate between 32 and 16-byte alignment.  in getNewAlignment()
113     // As a result, the new alignment will not be a constant, but can still  in getNewAlignment()
119     LLVM_DEBUG(dbgs() << "\ttrying start/inc alignment using start "  in getNewAlignment()
122     // Now compute the new alignment using the displacement to the value in the  in getNewAlignment()
123     // first iteration, and also the alignment using the per-iteration delta.  in getNewAlignment()
130     LLVM_DEBUG(dbgs() << "\tnew start alignment: " << DebugStr(NewAlignment)  in getNewAlignment()
132     LLVM_DEBUG(dbgs() << "\tnew inc alignment: " << DebugStr(NewIncAlignment)  in getNewAlignment()
141       LLVM_DEBUG(dbgs() << "\tnew start/inc alignment: "  in getNewAlignment()
146       LLVM_DEBUG(dbgs() << "\tnew start/inc alignment: " << DebugStr(NewAlign)  in getNewAlignment()
151     LLVM_DEBUG(dbgs() << "\tnew start/inc alignment: " << DebugStr(NewAlign)  in getNewAlignment()
247       // For memory transfers, there is also a source alignment that  in processAssumption()