[llvm] 0ce5f40 - [VPlan] Add getLiveInIRValue accessor to VPValue.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2021-01-06T11:20:42Z
New Revision: 0ce5f402e0166a33bea01d577ce8ee32189d80e3

URL: https://github.com/llvm/llvm-project/commit/0ce5f402e0166a33bea01d577ce8ee32189d80e3
DIFF: https://github.com/llvm/llvm-project/commit/0ce5f402e0166a33bea01d577ce8ee32189d80e3.diff

LOG: [VPlan] Add getLiveInIRValue accessor to VPValue.

This patch adds a new getLiveInIRValue accessor to VPValue, which
returns the underlying value, if the VPValue is defined outside of
VPlan. This is required to handle scalars in VPTransformState, which
requires dealing with scalars defined outside of VPlan.

We can simply check VPValue::Def to determine if the value is defined
inside a VPlan.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D92281

Added: 
    

Modified: 
    llvm/lib/Transforms/Vectorize/VPlanValue.h

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Transforms/Vectorize/VPlanValue.h b/llvm/lib/Transforms/Vectorize/VPlanValue.h
index 5bafe220785d..fdedafef2edd 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanValue.h
+++ b/llvm/lib/Transforms/Vectorize/VPlanValue.h
@@ -166,6 +166,15 @@ class VPValue {
   void replaceAllUsesWith(VPValue *New);
 
   VPDef *getDef() { return Def; }
+
+  /// Returns the underlying IR value, if this VPValue is defined outside the
+  /// scope of VPlan. Returns nullptr if the VPValue is defined by a VPDef
+  /// inside a VPlan.
+  Value *getLiveInIRValue() {
+    assert(!getDef() &&
+           "VPValue is not a live-in; it is defined by a VPDef inside a VPlan");
+    return getUnderlyingValue();
+  }
 };
 
 typedef DenseMap<Value *, VPValue *> Value2VPValueTy;