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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-01-24 23:28:42 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-01-24 23:28:42 +0000 |
| commit | d36f5af224594719a10d8b190daf4b56cdb7377f (patch) | |
| tree | 38419ea63d70da10be2fd74ca7ab8c4a13ebe2e6 /lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | |
| parent | 1ce6a36610f06a1fb4047ddde1e9bc2f071c0bfb (diff) | |
Set correct <def,undef> flags when lowering REG_SEQUENCE.
A REG_SEQUENCE instruction is lowered into a sequence of partial defs:
%vreg7:ssub_0<def,undef> = COPY %vreg20:ssub_0
%vreg7:ssub_1<def> = COPY %vreg2
%vreg7:ssub_2<def> = COPY %vreg2
%vreg7:ssub_3<def> = COPY %vreg2
The first def needs an <undef> flag to indicate it is the beginning of
the live range, while the other defs are read-modify-write. Previously,
we depended on LiveIntervalAnalysis to notice and fix the missing
<def,undef>, but that solution was never robust, it was causing problems
with ProcessImplicitDefs and the lowering of chained REG_SEQUENCE
instructions.
This fixes PR11841.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148879 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp')
0 files changed, 0 insertions, 0 deletions