diff options
| author | Dale Johannesen <dalej@apple.com> | 2008-09-20 02:03:04 +0000 |
|---|---|---|
| committer | Dale Johannesen <dalej@apple.com> | 2008-09-20 02:03:04 +0000 |
| commit | d9e4fd611933c2e32a8b1173c9ffa5133a6e18d5 (patch) | |
| tree | df3fded100e929eafbdbfd09d50b129602123914 /lib/CodeGen/RegAllocLinearScan.cpp | |
| parent | af3c4e378b4151a3192cc83e4e886f8d28f98f17 (diff) | |
| download | external_llvm-d9e4fd611933c2e32a8b1173c9ffa5133a6e18d5.zip external_llvm-d9e4fd611933c2e32a8b1173c9ffa5133a6e18d5.tar.gz external_llvm-d9e4fd611933c2e32a8b1173c9ffa5133a6e18d5.tar.bz2 | |
Teach coalescer about earlyclobber bits.
Check bits for preferred register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56384 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocLinearScan.cpp')
| -rw-r--r-- | lib/CodeGen/RegAllocLinearScan.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index df9d393..5a1944f 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -1122,9 +1122,12 @@ unsigned RALinScan::getFreePhysReg(LiveInterval *cur) { unsigned FreeRegInactiveCount = 0; // If copy coalescer has assigned a "preferred" register, check if it's - // available first. + // available first. Coalescer can create new earlyclobber interferences, + // so we need to check that. if (cur->preference) { - if (prt_->isRegAvail(cur->preference) && RC->contains(cur->preference)) { + if (prt_->isRegAvail(cur->preference) && + RC->contains(cur->preference) && + noEarlyClobberConflict(cur, cur->preference)) { DOUT << "\t\tassigned the preferred register: " << tri_->getName(cur->preference) << "\n"; return cur->preference; |