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| author | Andrew Trick <atrick@apple.com> | 2012-04-24 18:04:41 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2012-04-24 18:04:41 +0000 |
| commit | 9e9a9f146541b40a7a4c4c3a61e8f5b5de1c2c13 (patch) | |
| tree | a2f5abfae4bf932ca9e274d55a2813db33082155 /llvm/lib/CodeGen | |
| parent | c3ea00565f18ea04b23e135c44d3cdd165252db5 (diff) | |
| download | bcm5719-llvm-9e9a9f146541b40a7a4c4c3a61e8f5b5de1c2c13.tar.gz bcm5719-llvm-9e9a9f146541b40a7a4c4c3a61e8f5b5de1c2c13.zip | |
misched: DAG builder must special case earlyclobber
llvm-svn: 155459
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/ScheduleDAGInstrs.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp index e2f33aa7358..ed85963cc86 100644 --- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -442,6 +442,15 @@ void ScheduleDAGInstrs::addVRegUseDeps(SUnit *SU, unsigned OperIdx) { SlotIndex UseIdx = LIS->getInstructionIndex(MI).getRegSlot(); LiveInterval *LI = &LIS->getInterval(Reg); VNInfo *VNI = LI->getVNInfoBefore(UseIdx); + + // Special case: An early-clobber tied operand reads and writes the + // register one slot early. e.g. InlineAsm. + // + // FIXME: Same special case is in shrinkToUses. Hide under an API. + if (SlotIndex::isSameInstr(VNI->def, UseIdx)) { + UseIdx = VNI->def; + VNI = LI->getVNInfoBefore(UseIdx); + } // VNI will be valid because MachineOperand::readsReg() is checked by caller. MachineInstr *Def = LIS->getInstructionFromIndex(VNI->def); // Phis and other noninstructions (after coalescing) have a NULL Def. |
