Update InstCombineShifts.cpp

houngkoungting · web-flow · commit a5e73a03430c · 2025-03-15T23:33:20.000+08:00
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
@@ -994,11 +994,7 @@ static bool setShiftFlags(BinaryOperator &I, const SimplifyQuery &Q) {
       I.setIsExact();
       return true;
     }
-      // shr X, cttz(X)
-    if (match(I.getOperand(1), m_Intrinsic<Intrinsic::cttz>(m_Specific(I.getOperand(0))))) {
-      I.setIsExact();
-      return true;
-    }
+ 
   }
 
   // Compute what we know about shift count.

Original file line number	Diff line number	Diff line change
`@@ -994,11 +994,7 @@ static bool setShiftFlags(BinaryOperator &I, const SimplifyQuery &Q) {`
`994`	`994`	`I.setIsExact();`
`995`	`995`	`return true;`
`996`	`996`	`}`
`997`		`- // shr X, cttz(X)`
`998`		`- if (match(I.getOperand(1), m_Intrinsic<Intrinsic::cttz>(m_Specific(I.getOperand(0))))) {`
`999`		`- I.setIsExact();`
`1000`		`- return true;`
`1001`		`- }`
	`997`	`+`
`1002`	`998`	`}`
`1003`	`999`
`1004`	`1000`	`// Compute what we know about shift count.`