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llvm-svn: 123114
This commit is contained in:
Cameron Zwarich 2011-01-09 10:32:30 +00:00
parent 43f6d1b67e
commit a5910d1b31
1 changed files with 9 additions and 1 deletions
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10
llvm/lib/CodeGen/StrongPHIElimination.cpp
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@ -89,7 +89,15 @@ namespace {
/// Add a register in a new congruence class containing only itself. /// Add a register in a new congruence class containing only itself.
void addReg(unsigned); void addReg(unsigned);
/// Join the congruence classes of two registers. /// Join the congruence classes of two registers. This function is biased
/// towards the left argument, i.e. after
///
/// addReg(r2);
/// unionRegs(r1, r2);
///
/// the leader of the unioned congruence class is the same as the leader of
/// r1's congruence class prior to the union. This is actually relied upon
/// in the copy insertion code.
void unionRegs(unsigned, unsigned); void unionRegs(unsigned, unsigned);
/// Get the color of a register. The color is 0 if the register has been /// Get the color of a register. The color is 0 if the register has been