diff options
Diffstat (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp')
| -rw-r--r-- | lib/CodeGen/TwoAddressInstructionPass.cpp | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 7bd3f04bee..41b3cbd8ed 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -7,11 +7,16 @@ // //===----------------------------------------------------------------------===// // -// This file implements the LiveInterval analysis pass which is used -// by the Linear Scan Register allocator. This pass linearizes the -// basic blocks of the function in DFS order and uses the -// LiveVariables pass to conservatively compute live intervals for -// each virtual and physical register. +// This file implements the TwoAddress instruction pass which is used +// by most register allocators. Two-Address instructions are rewritten +// from: +// +// A = B op C +// +// to: +// +// A = B +// A = A op C // //===----------------------------------------------------------------------===// |