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X86: remove a dead store (NFC)

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The SP was always unconditionally assigned to later, but initialised early.
This delays the initialisation, and avoids the dead store.  Identified by
clang static analysis.  No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244423 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2015-08-09 20:39:09 +00:00
parent 15a7a33742
commit 964343c299
1 changed files with 2 additions and 2 deletions
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4
lib/Target/X86/X86CallFrameOptimization.cpp
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@ -304,7 +304,6 @@ void X86CallFrameOptimization::collectCallInfo(MachineFunction &MF,
// transformation.
const X86RegisterInfo &RegInfo = *static_cast<const X86RegisterInfo *>(
MF.getSubtarget().getRegisterInfo());
unsigned StackPtr = RegInfo.getStackRegister();
unsigned FrameDestroyOpcode = TII->getCallFrameDestroyOpcode();
// We expect to enter this at the beginning of a call sequence
@ -334,7 +333,8 @@ void X86CallFrameOptimization::collectCallInfo(MachineFunction &MF,
if (!I->isCopy() || !I->getOperand(0).isReg())
return;
Context.SPCopy = I++;
StackPtr = Context.SPCopy->getOperand(0).getReg();
unsigned StackPtr = Context.SPCopy->getOperand(0).getReg();
// Scan the call setup sequence for the pattern we're looking for.
// We only handle a simple case - a sequence of MOV32mi or MOV32mr