[llvm] c887700 - [SCEV] Remove zext/sext from BuildConstantForSCEV

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2023-09-28T15:23:58+02:00
New Revision: c887700f3b9df959a15fd56e7062329b14a1b786

URL: https://github.com/llvm/llvm-project/commit/c887700f3b9df959a15fd56e7062329b14a1b786
DIFF: https://github.com/llvm/llvm-project/commit/c887700f3b9df959a15fd56e7062329b14a1b786.diff

LOG: [SCEV] Remove zext/sext from BuildConstantForSCEV

In preparation for removing these constant expressions.

Added: 
    

Modified: 
    llvm/lib/Analysis/ScalarEvolution.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 9ffffcc018cb577..5a994ae2ea4f458 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -9666,18 +9666,6 @@ static Constant *BuildConstantFromSCEV(const SCEV *V) {
     return cast<SCEVConstant>(V)->getValue();
   case scUnknown:
     return dyn_cast<Constant>(cast<SCEVUnknown>(V)->getValue());
-  case scSignExtend: {
-    const SCEVSignExtendExpr *SS = cast<SCEVSignExtendExpr>(V);
-    if (Constant *CastOp = BuildConstantFromSCEV(SS->getOperand()))
-      return ConstantExpr::getSExt(CastOp, SS->getType());
-    return nullptr;
-  }
-  case scZeroExtend: {
-    const SCEVZeroExtendExpr *SZ = cast<SCEVZeroExtendExpr>(V);
-    if (Constant *CastOp = BuildConstantFromSCEV(SZ->getOperand()))
-      return ConstantExpr::getZExt(CastOp, SZ->getType());
-    return nullptr;
-  }
   case scPtrToInt: {
     const SCEVPtrToIntExpr *P2I = cast<SCEVPtrToIntExpr>(V);
     if (Constant *CastOp = BuildConstantFromSCEV(P2I->getOperand()))
@@ -9727,13 +9715,15 @@ static Constant *BuildConstantFromSCEV(const SCEV *V) {
     }
     return C;
   }
+  case scSignExtend:
+  case scZeroExtend:
   case scUDivExpr:
   case scSMaxExpr:
   case scUMaxExpr:
   case scSMinExpr:
   case scUMinExpr:
   case scSequentialUMinExpr:
-    return nullptr; // TODO: smax, umax, smin, umax, umin_seq.
+    return nullptr;
   }
   llvm_unreachable("Unknown SCEV kind!");
 }