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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-06-25 03:36:12 +0000 |
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| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-06-25 03:36:12 +0000 |
| commit | 70ed924e18538f3b793d6e53c901b364932e29df (patch) | |
| tree | 0d38e31baf24b729816fdb5d7f5f6aa124e26bf2 /llvm/lib/CodeGen/UnreachableBlockElim.cpp | |
| parent | 6b556f824d77db596e2d8a1fa058764f9a722e0d (diff) | |
| download | llvm-70ed924e18538f3b793d6e53c901b364932e29df.zip llvm-70ed924e18538f3b793d6e53c901b364932e29df.tar.gz llvm-70ed924e18538f3b793d6e53c901b364932e29df.tar.bz2 | |
Teach PHIElimination to handle <undef> operands.
When a PHI use is <undef>, don't emit a copy in the predecessor block,
but insert an IMPLICIT_DEF instruction instead. This ensures that
virtual register uses are always jointly dominated by defs, even if some
of them are IMPLICIT_DEF.
llvm-svn: 159121
Diffstat (limited to 'llvm/lib/CodeGen/UnreachableBlockElim.cpp')
0 files changed, 0 insertions, 0 deletions