Use LEA to adjust stack ptr for Atom. Patch by Andy Zhang.

[oota-llvm.git] / lib / Target / X86 / X86.td

diff --git a/lib/Target/X86/X86.td b/lib/Target/X86/X86.td
index d5db45b3cc50b2e0d9910e32f8c8dfe23a660dcd..7f2ece79dde2cfb3d45c0f8b080289ba84517e4c 100644 (file)
--- a/lib/Target/X86/X86.td
+++ b/lib/Target/X86/X86.td
@@ -115,6 +115,8 @@ def FeatureBMI     : SubtargetFeature<"bmi", "HasBMI", "true",
                                       "Support BMI instructions">;
 def FeatureBMI2    : SubtargetFeature<"bmi2", "HasBMI2", "true",
                                       "Support BMI2 instructions">;
+def FeatureLeaForSP : SubtargetFeature<"lea-sp", "UseLeaForSP", "true",
+                                     "Use LEA for adjusting the stack pointer">;
 
 //===----------------------------------------------------------------------===//
 // X86 processors supported.
@@ -155,7 +157,7 @@ def : Proc<"core2",           [FeatureSSSE3, FeatureCMPXCHG16B,
 def : Proc<"penryn",          [FeatureSSE41, FeatureCMPXCHG16B,
                                FeatureSlowBTMem]>;
 def : AtomProc<"atom",        [ProcIntelAtom, FeatureSSE3, FeatureCMPXCHG16B,
-                               FeatureMOVBE, FeatureSlowBTMem]>;
+                               FeatureMOVBE, FeatureSlowBTMem, FeatureLeaForSP]>;
 // "Arrandale" along with corei3 and corei5
 def : Proc<"corei7",          [FeatureSSE42, FeatureCMPXCHG16B,
                                FeatureSlowBTMem, FeatureFastUAMem,