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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-05-17 17:18:59 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-05-17 17:18:59 +0000 |
| commit | 9ef9cf930da64449cabc476e90b846db461e5764 (patch) | |
| tree | 23be1c21e4b966b9fc1de6c09a3f480ffa5bec4e /lib/CodeGen/RegAllocFast.cpp | |
| parent | 915fa2f0335d13ec3c2e9e048b5545259bad3fab (diff) | |
| download | external_llvm-9ef9cf930da64449cabc476e90b846db461e5764.zip external_llvm-9ef9cf930da64449cabc476e90b846db461e5764.tar.gz external_llvm-9ef9cf930da64449cabc476e90b846db461e5764.tar.bz2 | |
Avoid allocating the same physreg to multiple virtregs in one instruction.
While that approach works wonders for register pressure, it tends to break
everything.
This should unbreak the arm-linux builder and fix a number of miscompilations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103946 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocFast.cpp')
| -rw-r--r-- | lib/CodeGen/RegAllocFast.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp index ea3fa61..a8d1e0d 100644 --- a/lib/CodeGen/RegAllocFast.cpp +++ b/lib/CodeGen/RegAllocFast.cpp @@ -471,6 +471,7 @@ void RAFast::allocVirtReg(MachineInstr *MI, LiveRegEntry &LRE, unsigned Hint) { unsigned BestReg = 0, BestCost = spillImpossible; for (TargetRegisterClass::iterator I = AOB; I != AOE; ++I) { + if (UsedInInstr.test(*I)) continue; unsigned Cost = calcSpillCost(*I); // Cost is 0 when all aliases are already disabled. if (Cost == 0) |