AMDGPU: Implement early ifcvt target hooks.

Leave early ifcvt disabled for now since there are some
shader-db regressions.

This causes some immediate improvements, but could be better.
The cost checking that the pass does is based on critical path
length for out of order CPUs which we do not want so it skips out
on many cases we want.

llvm-svn: 293016

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
index c055b8c5f79..37a21c25a50 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -526,6 +526,11 @@ public:
     this->GISel.reset(&GISel);
   }
 
+  // XXX - Why is this here if it isn't in the default pass set?
+  bool enableEarlyIfConversion() const override {
+    return true;
+  }
+
   void overrideSchedPolicy(MachineSchedPolicy &Policy,
                            unsigned NumRegionInstrs) const override;