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| author | Bob Wilson <bob.wilson@apple.com> | 2010-03-04 21:04:38 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2010-03-04 21:04:38 +0000 |
| commit | cf6e29a818d8acb4a01519621111879cd7e5b97d (patch) | |
| tree | 25ade1e076ee852d22da376f2c2a53c4ecab6bc3 /llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp | |
| parent | e62248a79c2a63539278d740ce3c10e7481af32c (diff) | |
| download | bcm5719-llvm-cf6e29a818d8acb4a01519621111879cd7e5b97d.tar.gz bcm5719-llvm-cf6e29a818d8acb4a01519621111879cd7e5b97d.zip | |
pr6480: Don't try producing ld/st-multiple instructions when the address is
an undef value. This is only going to come up for bugpoint-reduced tests --
correct programs will not access memory at undefined addresses -- so it's not
worth the effort of doing anything more aggressive.
llvm-svn: 97745
Diffstat (limited to 'llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp index 5b4f02d6b75..19f1e3ba12c 100644 --- a/llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp +++ b/llvm/lib/Target/ARM/ARMLoadStoreOptimizer.cpp @@ -761,6 +761,11 @@ static bool isMemoryOp(const MachineInstr *MI) { MI->getOperand(0).isUndef()) return false; + // Likewise don't mess with references to undefined addresses. + if (MI->getNumOperands() > 1 && MI->getOperand(1).isReg() && + MI->getOperand(1).isUndef()) + return false; + int Opcode = MI->getOpcode(); switch (Opcode) { default: break; |
