return Changed ? &I : nullptr;
}
-//
-// Detect pattern:
-//
-// log2(Y*0.5)
-//
-// And check for corresponding fast math flags
-//
-
+/// Detect pattern log2(Y * 0.5) with corresponding fast math flags.
static void detectLog2OfHalf(Value *&Op, Value *&Y, IntrinsicInst *&Log2) {
-
- if (!Op->hasOneUse())
- return;
-
- IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op);
- if (!II)
- return;
- if (II->getIntrinsicID() != Intrinsic::log2 || !II->hasUnsafeAlgebra())
- return;
- Log2 = II;
-
- Value *OpLog2Of = II->getArgOperand(0);
- if (!OpLog2Of->hasOneUse())
- return;
-
- Instruction *I = dyn_cast<Instruction>(OpLog2Of);
- if (!I)
- return;
- if (I->getOpcode() != Instruction::FMul || !I->hasUnsafeAlgebra())
- return;
-
- if (match(I->getOperand(0), m_SpecificFP(0.5)))
- Y = I->getOperand(1);
- else if (match(I->getOperand(1), m_SpecificFP(0.5)))
- Y = I->getOperand(0);
+ if (!Op->hasOneUse())
+ return;
+
+ IntrinsicInst *II = dyn_cast<IntrinsicInst>(Op);
+ if (!II)
+ return;
+ if (II->getIntrinsicID() != Intrinsic::log2 || !II->hasUnsafeAlgebra())
+ return;
+ Log2 = II;
+
+ Value *OpLog2Of = II->getArgOperand(0);
+ if (!OpLog2Of->hasOneUse())
+ return;
+
+ Instruction *I = dyn_cast<Instruction>(OpLog2Of);
+ if (!I)
+ return;
+ if (I->getOpcode() != Instruction::FMul || !I->hasUnsafeAlgebra())
+ return;
+
+ if (match(I->getOperand(0), m_SpecificFP(0.5)))
+ Y = I->getOperand(1);
+ else if (match(I->getOperand(1), m_SpecificFP(0.5)))
+ Y = I->getOperand(0);
}
static bool isFiniteNonZeroFp(Constant *C) {