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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-05-14 21:10:25 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-05-14 21:10:25 +0000 |
| commit | 4d10829e1296b7aea0455e000fc318b147182c1c (patch) | |
| tree | 4cc8df441ee344dd4a463af800bad6952a1d99ce /lib/CodeGen/RegAllocFast.cpp | |
| parent | 3a884f5c17ac32e34e7e62b4602a0d73eeda1ce8 (diff) | |
| download | llvm-4d10829e1296b7aea0455e000fc318b147182c1c.tar.gz llvm-4d10829e1296b7aea0455e000fc318b147182c1c.tar.bz2 llvm-4d10829e1296b7aea0455e000fc318b147182c1c.tar.xz | |
Fix PR12821.
RAFast must add an <imp-def> operand when it is rewriting a sub-register
def that isn't a read-modify-write.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156777 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocFast.cpp')
| -rw-r--r-- | lib/CodeGen/RegAllocFast.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp index 70fbfd4c5c..15485b13da 100644 --- a/lib/CodeGen/RegAllocFast.cpp +++ b/lib/CodeGen/RegAllocFast.cpp @@ -674,6 +674,12 @@ bool RAFast::setPhysReg(MachineInstr *MI, unsigned OpNum, unsigned PhysReg) { MI->addRegisterKilled(PhysReg, TRI, true); return true; } + + // A <def,read-undef> of a sub-register requires an implicit def of the full + // register. + if (MO.isDef() && MO.isUndef()) + MI->addRegisterDefined(PhysReg, TRI); + return MO.isDead(); } |