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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 | c3ad885dac8b4ed1a092e3276aeb84810a4a250c (patch) | |
| tree | 20ae2721302969bc0bcdd66776b7c606c6e7717c /lib/CodeGen/ScheduleDAGInstrs.cpp | |
| parent | 000b2504eef6c1ff4a7857087b0a1cbe0f7e1b1a (diff) | |
| download | llvm-c3ad885dac8b4ed1a092e3276aeb84810a4a250c.tar.gz llvm-c3ad885dac8b4ed1a092e3276aeb84810a4a250c.tar.bz2 llvm-c3ad885dac8b4ed1a092e3276aeb84810a4a250c.tar.xz | |
misched: DAG builder must special case earlyclobber
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155459 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/ScheduleDAGInstrs.cpp')
| -rw-r--r-- | lib/CodeGen/ScheduleDAGInstrs.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp index e2f33aa735..ed85963cc8 100644 --- a/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/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. |