Use LEA to adjust stack ptr for Atom. Patch by Andy Zhang.
llvm-svn: 150008
diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index a9d95d3..f1ef118 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -257,6 +257,7 @@
// Set processor type. Currently only Atom is detected.
if (Family == 6 && Model == 28) {
X86ProcFamily = IntelAtom;
+ ToggleFeature(X86::FeatureLeaForSP);
}
unsigned MaxExtLevel;
@@ -340,6 +341,7 @@
, IsUAMemFast(false)
, HasVectorUAMem(false)
, HasCmpxchg16b(false)
+ , UseLeaForSP(false)
, PostRAScheduler(false)
, stackAlignment(4)
// FIXME: this is a known good value for Yonah. How about others?